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product structure : silicon monolithic integrated circuit this product has no designed protec tion against radioactive rays 1/35 ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 constant current led drivers for automotive constant current controller for automotive led lamps bd18340fv-m BD18341FV-M general description bd18340fv-m/BD18341FV-M are 70v-withstanding constant current controller for automotive led lamps. it is able to drive at maximum 10 rows of pnp transistors. it can also contribute to re duction in the consumption power of the set as it has t he integrated st andby function., the ic also incorporates a highly reliable, in-built de-rating function, led open detection, short circuit protection and over voltage mute function and led failure input/output function. features ? aec-q100 qualified (note1) ? led constant-current controller ? pwm dimming function ? led current de-rating function ? led open detection ? short circuit protection(scp) ? over voltage mute function(ovm) ? disable led open detection function at reduced-voltage ? abnormal output detection and output functions (note1: grade1) applications ? automotive led exterior lamp (rear lamp, turn lamp, drl/position lamp, fog lamp etc.) ? automotive led interior lamp (air conditioner lamp, interior lamp, cluster light etc.) typical application circuit key specifications ? input voltage range 4.5v to 19v ? fb terminal voltage accuracy 650mv 3% @ta = 25c to 125c ? stand-by current 0a(typ) ? led current de-rating accuracy bd18340fv-m : 5% @v dcdim =0.5 to 0.75v BD18341FV-M : 12% @v dcdim =0.5 to 0.75v ? operating temparature range -40c to +125c package w(typ) x d(typ) x h(max) ssop-b16 5.00mm x 6.40mm x 1.35mm bd18340fv-m BD18341FV-M op base fb dcdim crt d vin en pbus scp gnd pwmout vreg ntc r fb1 opm r dcdim r opm c vreg c crt r crt c d c vi n2 c vi n1 z d1 pwm_in dc_in d1d2 d3 c led disc r fb2 r lim r dcin ssop-b16 datashee t downloaded from: http:///
datasheet d a t a s h e e t 2/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 pin configuration pin description pin no. pin name function pin no. pin name function 1 fb input terminal for feedback voltage 9 opm the terminal to set disable led open detection voltage 2 base the terminal for connecting pnp tr. base 10 vreg internal reference voltage 3 n.c. pin not connected internally. (note 1) 11 dcdim the terminal to set dc dimming 4 op the terminal for led open detection 12 d the terminal to set disable led open detection time 5 scp the terminal for short circuit protection 13 crt the terminal to set cr timer 6 gnd gnd 14 disc discharge terminal for cr timer 7 pbus the terminal abnormal output detection and output 15 en enable input 8 pwmout cr timer signal output 16 vin power supply input (note 1) please be sure to floating at n.c. pin block diagram op base fb dcdim dc dimming vref cr timer gnd open mask d opm control logic vreg vin en pbus pbus openload scp scp pwmout v reg v in 1.2v ? 1.25v 1.2v v in 1m a 1.0v vreg over vo l ta g e mute crt d comp 1.0v delay rise 1s disc v reg v reg delay 20s fb 11 6 vin base 21 5 en n.c. 31 4 disc op 41 3 crt scp 51 2 d gnd 61 1 dcdim pbus 71 0 vr eg pwmout 89 opm (top view) downloaded from: http:///
datasheet d a t a s h e e t 3/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 absolute maximum ratings (ta=25c) parameter symbol rating unit supply voltage v in -0.3 to +70 v en,crt, disc terminal voltage v en , v crt, v disc -0.3 to +70 v fb,base,op,scp terminal voltage v fb , v base , v op ,v scp -0.3 to v in +0.3v v vin-fb, vin-base voltage across terminals v in -v fb ,v in -v base -0.3 to +5.0 v pbus,vreg dcdim terminal voltage v pbus , v reg, v dcdim -0.3 to +7.0 v pwmout, opm, d terminal voltage v pwmout , v opm , v d -0.3 to v reg +0.3 v operating temperature range t opr -40 to 125 c storage temperature range t stg -55 to 150 c junction temperature t jmax 150 c caution: operating the ic over the absolute maximum ratings may damage t he ic. the damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. therefore, it is import ant to consider circuit protection measures, such as adding a f use, in case the ic is operated over the absolute maximum ratings. thermal resistance (note2) parameter symbol thermal resistance (typ) unit 1s (note4) 2s2p (note5) ssop-b16 junction to ambient ja 140.9 77.2 c/w junction to top characterization parameter (note 3) jt 6 5 c/w (note2) based on jesd51-2a (still-air), (note3) the thermal characterization parameter to report the difference between junction temperature and the temperature at the top ce nter of the outside surface of the component package. (note4) using a pcb board based on jesd51-3. layer number of measurement board material board size single fr-4 114.3mm x 76.2mm x 1.57mmt top copper pattern thickness footprints and traces 70 m (note5) using a pcb board based on jesd51-7 layer number of measurement board material board size 4 layers fr-4 114.3mm x 76.2mm x 1.6mmt top 2 internal layers bottom copper pattern thickness copper patte rn thickness copper pattern thickness footprints and traces 70 m 74.2mm x 74.2mm 35 m 74.2mm x 74.2mm 70 m downloaded from: http:///
datasheet d a t a s h e e t 4/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 recommended operating conditions (ta=-40c to +125c) parameter symbol min typ max unit supply voltage (note1) (note2) v in 4.5 13 19 v crtimer frequency range f pwm 100 - 5000 hz pwm minimum pulse width (note3) t min 10 - - s (note1) aso should not be exceeded (note2) at start-up time, please apply a voltage above 5v once. the va lue is the voltage range after the temporary rise to 5v. (note3) at connecting the external pnp tr.(2 sar573d(rohm) ,1pcs), that is the same when the pulse input to crt terminal. operating conditions parameter symbol min max unit the capacitor connecting vin terminal1 c vin1 1.0 - f the capacitor connecting vin terminal2 c vin2 (note4) 0.047 - f the capacitor connecting vreg terminal c vreg (note5) 1.0 4.7 f the capacitor connecting led anode c led 0.1 0.68 f the capacitor connecting crt terminal c crt 0.01 0.22 f the resistor connecting crt terminal r crt 0.1 50 k ? the resistor for setting led current led r fb1 , r fb2 (note6) 0.8 6.5 ? the resisto r for setting disable led open detection voltage r opm 25 55 k ? the resistor for setting dc dimming r dcdim 4.7 50 k ? the resistor for dcin pull-down r dcin - 10 k ? the capacito r for setting disable led open detection time c d (note5) 0.001 0.1 f the resistor for limiting base terminal current r lim see features description 5 ? the external pnp transistor q 1 (note7) - (note4) rohm recommended value (0.1 f gcm188r11h104ka42 murata) (note5) ceramic capacitor recommended. please setting the disable le d open detection time less than pwm minimum pulse width. (note6) at connecting the external pn p tr. (2sar573d (rohm), 1pcs) (note7) for external pnp transistor, please use the recommended device 2sar573d for this ic. while using non-recommended part device, va lidate the design on actual board. please check hfe of the part to design base current limit resistor. (see features description, section 5). as for parasitic capacitance, please evaluate over shoot of i led on actual board. (see features description, section 8 -evaluation example, iled pulse width at pwm dimming operation). downloaded from: http:///
datasheet d a t a s h e e t 5/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 electrical characteristics1 (unless otherwise specified ta = -40 to +125c, v in = 13v, c vreg = 1.0f, transistor pnp = 2sar573d) parameter symbol limit unit conditions min typ max [ circuit current i vin ] circuit current at stand-by mode i vin1 - 0 10 a v en = 0v v fb =v in circuit current at normal mode i vin2 - 2.0 5.0 ma v en = v in , v fb =v in -1.0v base current subtracted circuit current at led open detection i vin3 - 2.0 5.0 ma v en = v in , v fb =v in -1.0v at led open detection circuit current at pbus=low i vin4 - 2.0 5.0 ma v en = v in , v fb =v in -1.0v v pbus = 0v [ vreg voltage ] vreg terminal voltage v reg 4.85 5.00 5.15 v i vreg = -100 a ta = 25 to 125c 4.75 5.00 5.25 v i vreg = -100 a ta = -40 to 125c vreg terminal current capability i vreg -1.0 - - ma [ drv ] fb terminal voltage v fbreg 630 650 670 mv v fbreg = v in - v fb r fb1 = r fb2 = 1.8 ? , ta = 25 to 125c 617 650 683 mv v fbreg = v in - v fb r fb1 = r fb2 = 1.8 ? , ta = -40 to 125c fb terminal input current i fb 7.5 15 30 a v fb = v in base terminal sink current capability i base 10 - - ma v fb = v in , v base = v in - 1.5v ta = 25c base terminal pull-up resistor r base 0.5 1.0 1.5 k ? v crt = 0v v fb = v in , v base = v in - 1.0v [ led current de-rating function (dc dimming function) ] dc dimming gain d dg 688 725 762 mv / v S v fbreg / S v dcdim v dcdim 0.75v -> 0.35v bd18340fv-m fb terminal voltage v dcdim = 0.75v v fb_dc1 443 466 489 mv fb terminal voltage v dcdim = 0.50v v fb_dc2 270 284 298 mv fb terminal voltage v dcdim = 0.35v v fb_dc3 161 175 189 mv BD18341FV-M fb terminal voltage v dcdim = 0.75v v fb_dc1 413 466 522 mv fb terminal voltage v dcdim = 0.50v v fb_dc2 250 284 318 mv fb terminal voltage v dcdim = 0.35v v fb_dc3 155 175 196 mv [ over voltage mute function(ovm) ] over voltage mute start voltage v ovms 20.0 22.0 24.0 v ? v fb = 10.0mv ? v fb = v fb (@v in = 13v) C v fb (@v in = v ovm ) over voltage mute gain v ovmg - -25 - mv / v ? v fb / ? v in downloaded from: http:///
datasheet d a t a s h e e t 6/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 electrical characteristics2 (unless otherwise specified ta = -40 to +125c, v in = 13v, c vreg = 1.0f, transistor pnp = 2sar573d) parameter symbol limit unit conditions min typ max [ crtimer ] crt terminal charge current i crt 36 40 44 a crt terminal charge voltage v crt_cha 0.72 0.80 0.88 v crt terminal discharge voltage 1 v crt_dis1 1.80 2.00 2.20 v crt terminal discharge voltage 2 v crt_dis2 2.10 2.40 3.00 v when v crt > v crt_dis2 , r d1 -> r d2 crt terminal charge resistor r cha 28.5 30.0 31.5 k ? r cha = (v crt_dis1- v crt_cha )/ i crt cr timer discharge constant v crt_cha / v crt_dis1 0.38 0.40 0.42 v / v disc terminal on resistor 1 r disc1 20 50 100 ? i disc = 10ma disc terminal on resistor 2 r disc2 2.5 5.0 10 k ? i disc = 100 a pwmout terminal output high voltage v pwmouth 4.0 - 5.5 v i pwmout = -100 a pwmout terminal output low voltage v pwmoutl - - 0.5 v i pwmout = 100 a pwmout terminal sink current capability i pwmout _sink - - 0.5 ma pwmout terminal source current capability i pwmout _source -0.5 - - ma crt terminal leakage current i crt_leak - - 10 a v crt = 70v [ led open detection ] led open detection voltage v opd 1.1 1.2 1.3 v v opd = v in - v op op terminal input current i op 19 21 23 a v op = v in - 0.5v [ disable led open detection function at reduced-voltage] opm terminal source current i opm 38 40 42 a vin terminal disable led open detection voltage at reduced-voltage v in_opm v opm 5.9 v opm 6.0 v opm 6.1 v vin terminal voltage opm terminal input voltage range v opm_r 1.0 - 2.2 v [ disable led open detection time setting ] input threshold voltage v dh 0.9 1.0 1.1 v d terminal source current i dsource 100 230 400 a d terminal on resistor r d - - 950 ? i d_ext = 100 a downloaded from: http:///
datasheet d a t a s h e e t 7/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 electrical characteristics3 (unless otherwise specified ta = -40 to +125c, v in = 13v, c vreg = 1.0f, transistor pnp = 2sar573d) parameter symbol limit unit conditions min typ max [ short circuit protection(scp) ] short circuit protection voltage v scp1 1.1 1.2 1.3 v short circuit protection release voltage v scpr 1.15 1.25 1.35 v short circuit protection hysteresis voltage v scphys - 50 - mv scp terminal source current i scp 0.2 1.0 2.0 ma scp terminal source current on voltage v scp2 1.15 1.30 1.45 v scp delay time t scp2 10 20 45 s [ pbus ] input high voltage v pbush 2.40 - - v input low voltage v pbusl - - 0.6 v hysteresis voltage v pbushys - 200 - mv pbus terminal source current i pbus 75 150 300 a v en = 5v pbus terminal output low voltage r pbus - - 0.6 v i pbus_ext = 3ma pbus terminal output high voltage v pbus_oh 3.5 4.5 5.5 v i pbus_ext = -10 a pbus terminal leakage current i pbus_leak - - 10 a v pbus = 7v [ en ] input high voltage v enh 2.4 - - v input low voltage v enl - - 0.6 v hysteresis voltage v enhys - 60 - mv terminal input current i en - 7 15 a v en = 5v [ uvlo vin ] uvlo detection voltage v uvlod 3.88 4.10 4.32 v v in : sweep down uvlo release voltage v uvlor 4.25 4.50 4.75 v v in : sweep up v reg > 3.75v uvlo hysteresis voltage v hys - 0.4 - v downloaded from: http:///
datasheet d a t a s h e e t 8/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 typical performance curves (reference data) (unless otherwise specified ta = 25c, v in = 13v, c vreg = 1.0f, transistor pnp = 2sar573d) figure 1. i vin2 vs v in figure 2. v reg vs v in figure 3. v reg vs temp figure 4. i led vs r fb1 +r fb2 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 2 4 6 8 10 12 14 16 18 20 i vin2 [ma] v in [v] 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 2 4 6 8 10 12 14 16 18 20 v reg [v] v in [v] 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 -50-25 0 255075100125150 v reg [v] temp[c] 0 100 200 300 400 500 0 2 4 6 8 10 12 14 i led [ma] r fb1 +r fb2 [ ? ] ta=125c ta= 25c ta=-40c ta=125c ta= 25c ta=-40c downloaded from: http:///
datasheet d a t a s h e e t 9/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 typical performance curves (reference data) (unless otherwise specified ta = 25c, v in = 13v, c vreg = 1.0f, transistor pnp = 2sar573d) figure 5. ? i led vs r fb1 +r fb2 figure 6. v fbreg vs temp figure 7. v fbreg vs v dcdim figure 8. d dg vs temp -5 -4 -3 -2 -1 0 1 2 3 4 5 0 2 4 6 8 1 01 21 4 S i led [%] r fb1 +r fb2 [ ? ] 610 620 630 640 650 660 670 680 690 -50 -25 0 25 50 75 100 125 150 v fbreg [mv] temp[c] 0 100 200 300 400 500 600 700 800 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 v fbreg [mv] v dcdim [v] 680 690 700 710 720 730 740 750 760 -50-25 0 255075100125150 d dg [mv/v] temp[c] S i led = ( i led / ( 0.65v / r fb1 +r fb2 ) ) -1 ) x100 [ % ] ta=125c ta= 25c ta=-40c downloaded from: http:///
datasheet d a t a s h e e t 10/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 typical performance curves (reference data) (unless otherwise specified ta = 25c, v in = 13v, c vreg = 1.0f, transistor pnp = 2sar573d) figure 9. i base vs v in figure 10. v fbreg vs v in figure 11. i crt vs temp figure 12. i opm vs temp 10 15 20 25 30 35 40 45 50 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 i base [ma] v in [v] 0 100 200 300 400 500 600 700 800 6 11162126313641465156 v fbreg [mv] v in [v] 38.0 38.5 39.0 39.5 40.0 40.5 41.0 41.5 42.0 -50 -25 0 25 50 75 100 125 150 i crt [ a] temp[ ] 38.0 38.5 39.0 39.5 40.0 40.5 41.0 41.5 42.0 -50 -25 0 25 50 75 100 125 150 i opm [ a] temp[ ] ta=125c ta= 25c ta = - 4 0 c ta=125c ta= 25c ta = - 4 0 c downloaded from: http:///
datasheet d a t a s h e e t 11/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 features description (unless otherwise specified, ta=25c, v in =13v, transistor pnp = 2sar573d, and numbers are typical values.) 1. led current setting led current i led can be defined by setting resistances r fb1 and r fb2 . where: v fbreg is the fb terminal voltage 650mv (typ) ? how to connect led current setting resistors led current setting resistors must always be connected at least in pair arranged in series as below. if only one current setting resistor is used, then in case of a possible resistor short, the external pnp tr. and led may be broken due to large current flow. pnp tr. rating current, led rating current, r fb1 and r fb2 must have the following relations: _ _ , where: i led_max is the led rating current i pnp_max is the pnp tr. rating current v fbreg is the fb terminal voltage 650mv(typ) minr fb ,r fb is the lowest value of r fb1 and r fb2 base fb vref gnd vreg vin en +b r fb2 r fb1 vreg c vreg i led v ce(sat) figure 13. led current setting ? constant current control dynamic range constant current control dynamic range of led current i led can be calculated as follows. _ ? _ where: v in is the vin terminal voltage v f_led is the led vf n is the number of rows of led v cesat is the external pnp tr. collec tor-emitter satura tion voltage v fbreg is the fb terminal voltage 650mv(typ) 2. reference-voltage (vreg) vin terminal generates 5.0v (typ). this vo ltage is used as power source for the internal circuit, and also used to fix the voltage of terminals outside lsi to high si de. vreg terminal must be connected with c vreg = 1.0 f to 4.7 f to ensure capacity for the phase compensation. if c vreg is not connected, the circuit behavior would become extraordinarily unstable, for example with the oscillatio n of the reference-voltage. vreg terminal voltage must not be used as po wer source for other devices than this lsi. vreg circuit has a built-in uvlo function. the ic is activate d when the vreg terminal voltage rises to 4.0v (typ) or higher, and shut down when the vreg terminal voltage drops to 3.75v(typ) or lower. downloaded from: http:///
datasheet d a t a s h e e t 12/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 3. table of operations the pwm dimming mode switches to dc control depending on crt terminal voltage. when v in > 22.0v (typ), led current is limited to reduce the heat dissipation of external pnp tr. depending on op/scp terminal voltage status, output current is turned off. output current is also turned off when low signal is input to pbus terminal. in addition, uvlo, tsd further increases system reliability for each functions, please refer to features description. operation mode crt terminal detecting condition led current (i led) pbus terminal detect release stand-by mode (note1) - v en 0.6v v en 2.4v off (note3) hi-z dc v crt 2.0v(typ) - - 50ma to 400ma high (4.5v(typ)) pwm dimming see features description, 4. - - see features description, 4. high (4.5v(typ)) dc dimming - v dcdim 1.0v(typ) v dcdim > 1.25v see features description, 9. high (4.5v(typ)) over voltage mute - v in > 22.0v(typ) v in 22.0v(typ) see features description, 11. high (4.5v(typ)) led open detection (note2) - v op v in C1.2v(typ) v op < v in C 1.2v(typ) off (note3) low short circuit protection ( scp ) - v scp 1.2v(typ) v scp 1.25v(typ) off (note3) low pbus control off - v pbus 0.6v v pbus 2.4v off (note3) input v pbus 0.6v uvlo - v in 4.1v(typ) or v reg 3.75v(typ) v in 4.5v(typ) or v reg 4.0v(typ) off (note3) high (4.5v(typ)) tsd - tj 175 ? c(typ) tj 150 ? c(typ) off (note3) hi-z (note1) circuit current 0 a(typ) (note1) in regard to the sequence of led current off, see features description, 5. (note2) base terminal current: off, and led current (i led ): off. downloaded from: http:///
datasheet d a t a s h e e t 13/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 4. pwm dimming operation using external rc network pwm dimming is performed with the following circuit. the ramp up/down time of the crt voltage, and therefore the dimming cycle and duty, can be set by values of the external components (c crt , r crt ) . please connect crt to vin and disc to gnd or open if it is not used. the cr timer function is activated if dc sw is open. to perform pwm light control of led current, a triangular waveform is generated at crt terminal. the led current (i led ) is turned off while crt voltage is ramping up, and led current(i led ) is turned on while crt voltage is ramping down. when v crt > v crt_dis1 (2.0v(typ)), dimming mode turns to dc control. when v crt > v crt_dis2 (2.4v(typ)), discharge resistance of disc terminal changes from r disc1 (50 ? (typ)) to r disc2 (5k ? (typ)). gnd crt control logic pwmout v reg c crt r crt i crt base fb vref vreg vin en disc dc sw open pwm sw on i led r disc1 r disc2 v crt_dis2 v crt_dis1 figure 14. pwm dimming operation crt terminal waveform 2.0v(typ) 0.8v(typ) i led on i led off v crt_dis1 v crt_cha t off t on pwmout terminal waveform 5v0v led current i led crt voltage ramp-up crt voltage ramp-down t off = S v crt c crt i crt =r cha c crt t on = - (r crt + r disc1 ) c crt ln v crt_cha v crt_dis1 i led on i led off i led on i led off S v crt figure 15. pwm dimming operation downloaded from: http:///
datasheet d a t a s h e e t 14/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 (1) crt ramp up time t off and crt ramp down time t on crt ramp up time t off and crt ramp down time t on can be defined from the following equations. make sure that t on is set > pwm minimum pulse width t min :10 s (min). ? _ _ where: i crt is the crt terminal charge current 40 a(typ) r cha is the crt terminal charge resistor 30k ? (typ) r disc is the disc terminal on resistor1 50 ? (typ) v crt_cha is the crt terminal charge voltage 0.8v(typ) v crt_dis is the crt terminal discharge voltage1 2.0v(typ) (2) pwm dimming frequency f pwm pwm frequency is defined by t on and t off . (3) on duty(d on ) like the above, pwm on duty is defined by t on and t off . % (example) in case of r crt =3.6k ? , c crt =0.1 f (typ) t off = r cha c crt = 30k ? 0.1 f = 3.0ms t on = - (r crt + r disc1 ) c crt ln(v crt_cha / v crt_dis1 )= - (3.6k ? + 50 ? ) 0.1 f ln(0.8v / 2.0v) = 0.334ms f pwm = 1 / (t on + t off ) = 1 / (3.0ms + 0.334ms) = 300hz d on = t on / (t on + t off ) = 0.334ms / (3.0ms + 0.334ms) = 10.0% pwm dimming operation using external signal in case external pwm input to crt terminal, make sure that input pulse high voltage > 2.2v and pulse low voltage< 0.72v . also please open disc terminal or connect to gnd. figure 16. pwm dimming operation using external signal gnd crt control logic v reg i crt base fb vref vreg vin en disc i led -con or crtimer downloaded from: http:///
datasheet d a t a s h e e t 15/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 ? about a reverse connection protection diode caution on using reverse protection diode with temperature, reverse current i r of diode (d2, d3) can affect the char ge and discharge current to capacitance c1. it is recommended to choose a diode (d2, d3) with ir value less than 1 a. to avoid high-z at point a,a resistor r dcin of 10k ? is also recommended between point a and gnd. crt rise / fall time devia tion from set values during the pwm dimming operation mode, the a-point on figure.17 becomes hi-z reverse current ir of d2 and d3 goes to the a-point (power supply voltage is being input into the cathode of d2 , so reverse current of d2 goes to mainly into c1) ? reverse current ir of d3 is added to the crt terminal charge current and discharge current, so crt start-up / fall time deviates from the settings. c1 gets charged, voltage at a-point rises voltage at a-point exceeds voltage in crt terminals of each ic vf occurs in the diodes d3 d3 circulate forward current if ? forward current if of d3 is added to the crt terminal charge current and discharge current, so crt start-up / fall time deviates from the settings. repetition - figure 17. how reverse protection diode affects the crt terminal rise/fall time bd18340fv-m BD18341FV-M gnd crt base fb vin en disc r dcin d1 d2 d3 ir if vf a point c1 downloaded from: http:///
datasheet d a t a s h e e t 16/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 5. led open detection function the ic can detect led open condition when the op terminal voltage (v op ) meets the following condition: v op > v in - 1.2v (typ). as soon as v op > v in - 1.2 v (typ) condition is achieved, d terminal source current (230 a (typ)) turns on and starts charging the disable led open detection time setting capacitor (c d ). once the d terminal voltage (v d ) becomes higher than 1.0 v (typ) and 1 s (typ) elapses, the base terminal sink current (i base ) is latched off and pbus terminal voltage (v pbus ) is switched to low. [base current limit resistance (r lim )] the op terminal voltage v op is defined by the following formula: (note that the external pnp tr. goes into th e saturation mode when the collector is open) _ _ _ 6./ _ 8 where: r fb , r fb is the led current setting resistance i base_max is the maximum base terminal sink current r lim is the base terminal sink current limit resistance v ce_pnp is the external pnp tr. collector-emitter voltage (note: i ce =i op (23 a (max))) please determine the base current limit resistance r lim to ensure that the op terminal voltage when the led is open should meet the following condition: v op > v in - 1.2 v (typ). also note that the base current lim it resistance must meet the following condition in order to obtain the base current to be needed during normal led operation. 4./ / _ where: hfe _min is the minimum external pnp tr. hfe disable led open detection time t d , or the length of time from the moment the op terminal voltage meets the condition v op > v in - 1.2 v (typ) until the moment the base terminal sink current (i base ) is latched off, can be defined by the following formula. note that the disable time must be shorter than the on pulse width of the pwm dimming. where: t on is the on pulse width of the pwm dimming(crt ramp down time) c d is the disable led open detection time setting capacitor v dh is the d terminal input threshold voltage 1.0v (typ) i d is t he d terminal source current 230 a (typ) to reset the latched off led current, en must be turned-on again (the time when en terminal is l: more than 50 s ) or the condition uvlo (v in < 4.1 v or v reg < 3.75 v) must be fulfilled. op base fb gnd d control logic pbus pbus led open 1.2v vi n d comp 1.0v delay 1 s open v in v op v d drv c d c led 230ua i base r fb1 r fb2 21 a r lim v ce_pnp d terminal voltage v d led open detection comparator output op termina l voltage v op pbusterminal voltage v pbus i led latch release condtion : en h l or uvlo detect v f_led v in vin - 1.2v(typ) i base on (drv on) i base off(drv off) 1 s (typ) 1.0v (typ) discharge co by op terminal input current(21 a) led open c d 1.0v 230 a figure 18. led open detection timing chart downloaded from: http:///
datasheet d a t a s h e e t 17/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 6. disable led open detection function at reduced-voltage the disable led open detection function serves to prevent false detection of led open at t he reduced-voltage during the ramp-up/ramp-down of the vin terminal voltage. led open will not be detected until the vin terminal disable open detection voltage at reduced-voltage (v in_opm ). once v in_opm is surpassed, the led current will be latched off (base terminal sink current (i base ) is latched off) and the pbus voltage will be switched to low following the sequence explained in description of functions 5. v in_opm must be defined by the following formula. (the opm terminal voltage must be set between 1.0 v to 2.2 v.) _ _ where: v in_opm is the vin terminal disable open detection voltage at reduced-voltage v in_operr is the vin terminal open erroneous detection voltage at reduced-voltage _ 6. _ _ where: v opm is the opm terminal voltage figure 19. disable led open detection function i opm is the terminal source current 40 a (typ) at reduced-voltage r opm is the opm terminal connection resistance v f_led is the led vf n is the number of rows of led v opd is the led open-circuit de tection voltage 1.2 v (typ) ? when installing heat sink resistor, or connecting r esistor or diodes between op terminal and led anode. when you need to install a heat sink resistor in series with th e led requiring a large amount of current in order to reduce the heat generation from the ex ternal pnp tr, when multiple rows of the leds are driven, or when you connect a resistor to adjust the threshold voltage for detecting t he led open-circuit, the formula to calculate v in_operr will be different from the one above. please read the applicationn ote of bd1834x series for details. v in v op i led v pbus v in_opm v in__opm v in > v f_led n + v ce_pnp + v fbreg led open detection area led open detection area v in v opd = v in -1.2v v op = v f_led n 4.5v disable led open detection area i led v in_operr v in_operr controllable range of constant current disable led open detection area figure 20. vin terminal disable led open detecti on voltage and led open erroneous detection voltage at reduced-voltage gnd control logic i op m base fb vref open mask opm v reg r opm openload v opd =1.2v v in op v f_led n v ce_pnp v in downloaded from: http:///
datasheet d a t a s h e e t 18/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 7. short circuit protection (scp) short circuit protection function lowers t he scp terminal voltage when the collector of the external pnp tr. is grounded. after a lapse of the short circ uit protection delay time (t scp )(20 s(typ)) following the drop of the scp terminal voltage (v scp ) under 1.2v(typ), the external pnp tr. is turned off to prevent its thermal de struction, and the pbus terminal is switched to low to communicate the faulty condition. in order to avoid malfunction, the short circuit protecti on function will not be activated until crt > 2.0 v(typ) after uvlo is reset. in case where the short circuit (v scp < 1.2v(typ)) is present from the beginning when the power is turned on, the short circuit protection function will be activated 60s(typ) after v crt > 2.0v(typ) condition is reached. scp base fb vref control logic vreg vin en pbus pbus gnd scp vin 1.2v ? 1.25v 1ma short 20s filter v scp i led v pbu s i led 20 s 1.2v high off on v in v crt 2.0v 60 s 1.25v 1.25v off off low low on high high s h o r t c i r c u i t s h o r t c i r c u i t on 4.5v figure 21. short circuit protection (scp) ? scp terminal source current the scp terminal sources the scp terminal source current (1ma (typ)) once its voltage (v scp ) drops under 1.3v in order to prevent the malfunction of the short circuit protection. scp base fb vref control logic vreg vin en pbus pbus gnd scp 1.2v ? 1.25v vin 1ma 1.25v ? 1.3v v scp i scp 1.0ma(typ) 1.3v(typ) 0ma 0v i scp 20s filter figure 22. scp terminal source current downloaded from: http:///
datasheet d a t a s h e e t 19/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 8. about the capacitor of connecting led anode during pwm mode, the output (led anode) will be high impedance (hi-z). during this time noise (note1) can couple on to this pin and cause false detection of short condition. to prevent this it is necessary to connect a capacitor (0.1f to 0.68f) between le d anode and gnd terminal nearby terminal (note1) conducted noise, radiated noise, crosstalk of connecter and pcb pattern etc make sure that the capacitor of connecting led anode is the following equation: . .68 in case above range is exceeded, the i led current becomes dull, so please evaluate i led waveform in pwm mode operation. (please refer to the following waveform). about the example of evaluation, please see to the following waveform. in case a capacitor exceeding the recommended range (above 0.68 f) is connected to led anodel, there is a possibility that delay time of start-up will reach about several decades ms, so special attention is needed. gnd crt control logic pwmout vreg i crt base fb vref vreg vin en disc c led i led figure 23. about the capacitor of connecting led anode downloaded from: http:///
datasheet d a t a s h e e t 20/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 evaluation example (iled pulse wi dth at pwm dimming operation) condition: +b = 13v ta = 25c led = 1 strings c crt = 0.01 f r disc = 1.0k ? pwm dimming mode downloaded from: http:///
datasheet d a t a s h e e t 21/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 9. led current de-rating function (dc dimming function) the led current (i led ) will be cut down once the dcdim terminal voltage goes under 1.0 v (typ). if led de-rating function is not used, please dcdim terminal mu st be kept below 1.25v always and as stable as possible. any ripples at dcdim terminal will cause oscillations in output current i led .it is recommended to insert a capacitor at dcdim terminal. steep changes in the dcdim termi nal voltage also might affect the ability of the output amplifier to keep up with the changes. so please evaluate i led waveform on actual board . the led current de-rating function can be defined by the following formula: ? . . where: r dcdim is the resistor for setting dc dimming r ntc is the ntc thermistor resistance v fbreg is the fb terminal voltage vin C 650 mv (typ) d dg is the dcdim dimming gain 725 mv/v (typ) base fb vref vreg vin en dcdim dc dimming r ntc 1.0v r dcdim gnd i led r prvt cattr i led vreg v dcdim [v] 0.35 0.75 1.0 v fbreg (v in -v fb ) [mv] 466 650 0 175 1.25 284 0.5 figure 24. led current de-rating function (dc dimming function) downloaded from: http:///
datasheet d a t a s h e e t 22/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 10. pbus function the pbus terminal has two functions. when the ic det ects open/short of leds the pbus is pulled low. it is also possible to turn off i led current by externally pulling the pbus to low voltage. this feat ure is useful when multiple this ics are used to drive led loads. an open/sho rt detection by one ic can be used to turn off current of other driver ics. (please refer connection diagram below) caution of using pbus terminal always connect only pbus terminal of bd18340 and bd18341 ics. interconnection with other family products does not guarantee proper operating conditions bd18340fv-m BD18341FV-M ch 1 base fb vin en gnd pbus bd18340fv-m BD18341FV-M ch 2 pbus led open led off communication each other by pbus op vin en gnd base fb op figure 25. pbus function example of protective operat ion due to led open circuit ch1 pnp tr. collector voltage ch1 i led v pbus ch2 pnp tr. cllctr vlta ch2 i led ch1 led open after ch1led open detection mask time i led latch off v pbus high low off v pbus high low ch2 pnp tr. : off on off on figure 26. example of protective operation if led open occurs, pbus of ch1 is switched from hi- z to low output. as pbus becomes low, led drivers of other ch detect the condition and turns off their own leds. led anode clamps to 1.3v (typ) during the off period, in order to prohibit ground fault detection. downloaded from: http:///
datasheet d a t a s h e e t 23/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 11. over voltage mute function (ovm) once the vin terminal voltage (v in ) goes above 22.0 v (typ), the over voltage mute function is activated to decrease the led current (i led ) in order to suppress heat generation from the external pnp tr. the fb terminal voltage v fbreg which controls the led current (i led ) will decay at -25 mv/v (typ). base fb vref gnd vreg vin en over vo l ta g e mute v in [v] v ovm s v in -v fb [mv] 650 0 22.0v(typ) -25mv/v(typ) output current is muted by power supply overvoltage figure 27. overvoltage mute function (ovm) 12. under voltage lockout (uvlo) uvlo is a protection circuit to prevent malfunction of the ic when the power is turned on or then the power is suddenly shut off. this ic has two uvlo circuits; uvlo vin for v in and uvlo vreg for v reg . as soon as uvlo status is detected, base terminal sink current will be turned off to switch off the led current (i led ). the following shows the threshold conditions of both uvlo circuits. operating mode detection conditions led current (i led) pbus terminal [detect] [release] uvlo vin v in 4.1 v(typ) v in 4.5 v(typ) off (note1) high output (4.5 v (typ)) uvlo vreg v reg 3.75v(typ) v reg 4.0 v(typ) off (note1) high output (4.5 v (typ)) (note 1) base terminal sink current is turned off to switch off the led current i led . downloaded from: http:///
datasheet d a t a s h e e t 24/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 timing chart (unless otherwise specified ta=25c, vin=13v, transistor pnp=2sar573d, led2strings, value is typical.) output gnd short v in v en v reg v crt v d v pbu s v fbreg i led 13v 4.5v 13v led open v op v sc p 1.0v output gnd sh ort 20 s 1.25v 13v led open 1.0v 1.25v 1.25v 20 s 1.25v 4.1v output latch off output latch off 0.6v 2.4v 0.6v 2.4v en reclosing en reclosing pwm dimming mode dc mode vin-1.2v vi n-1 .2v 4.0v 4.0v 1.2v 1.2v figure 28. timing chart downloaded from: http:///
datasheet d a t a s h e e t 25/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 recommended application circuit (1) iled=120ma bd18340fv-m BD18341FV-M op base fb dcdim crt d vin en pbus scp gnd pwmout vreg r fb1 opm r opm c vreg c d c vi n2 c vi n1 z d1 dc_in d1 c led disc r fb2 q1 u1 figure 29. recommended application circuit1 (i led 120ma, led white 2strings) recommended parts list1 (i led 120ma, led white 2strings) parts no parts name value unit product maker ic u1 bd18340fv-m/BD18341FV-M - - rohm diode d1 rfn2l6s - - rohm z d1 tnr12h-220k - - nippon chemicon pnp tr. q1 2sar573d - - rohm resistor r fb1 ltr10 series 2.7 ? rohm r fb2 ltr10 series 2.7 ? rohm r opm mcr03 series 39 k ? rohm capacitor c vin1 gcm32er71h475ka40 4.7 f murata c vin2 gcm188r11h104ka42 0.1 f murata c vreg gcm188r71e105ka49 1.0 f murata c d gcm188r11h103ka01 0.01 f murata c led gcm188r11h104ka42 0.1 f murata (about z d1 , please place according to test standard of battery line.) please note the following 1. external pnp transistor for external pnp transistor, please use the recommended device 2sar573d for this ic. while using non-recommended device, validate the design on actual board. please check hfe of the part to design base current limit resistor. (see features de scription, section 5). as for parasitic capacitance (c led connected at led anode), the more it is small over shoot will be smaller . pleaese use devices that parasitic capacitance smaller than recommended device, also parasitic capacitance is possible to variation by pcb layout. so please evaluate over shoot of i led on actual board. (see features descripti on, section 8 -evaluation example, iled pulse width at pwm dimming operation). 2. power supply steep variation this ic is validated with test c onditions as per iso7637-2 standards. there is possibility of unexpected led regulation due to sudden transients outside the specific ation range standards in input power supply.please check the maximum ratings of led and ev aluate on actual board for any unexpected led regulation. downloaded from: http:///
datasheet d a t a s h e e t 26/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 (2) iled=120ma, pwm on duty=10% bd18340fv-m BD18341FV-M op base fb dcdim crt d vin en pbus scp gnd pwmout vreg r fb1 opm r opm c vreg c crt r crt c d c vi n2 c vi n1 z d1 pwm_in dc_in d1d2 d3 c led disc r fb2 q1 r dcin u1 figure 30. recommended application circuit 2 (i led 120ma , led white 2strings, pwm on duty: 10%(pulse width 0.334ms), pwm frequency 300hz) recommended parts list 2 (i led 120ma, led white 2strings, pwm on duty: 10%( pulse width: 0.334ms),pwm frequency: 300hz) parts no parts name value unit product maker ic u1 bd18340fv-m/BD18341FV-M - - rohm diode d1,d2 rfn2l6s - - rohm d3 rfn1l6s - - rohm z d1 tnr12h-220k - - nippon chemicon pnp tr. q1 2sar573d - - rohm resistor r fb1 ltr10 series 2.7 ? rohm r fb2 ltr10 series 2.7 ? rohm r crt mcr03 series 3.6 k ? rohm r opm mcr03 series 39 k ? rohm r dcin esr10 series 2 k ? rohm capacitor c vin1 gcm32er71h475ka40 4.7 f murata c vin2 gcm188r11h104ka42 0.1 f murata c vreg gcm188r71e105ka49 1.0 f murata c crt gcm188r11h104ka42 0.1 f murata c d gcm188r11h103ka01 0.01 f murata c led gcm188r11h104ka42 0.1 f murata (about z d1 , please place according to test standard of battery line.) downloaded from: http:///
datasheet d a t a s h e e t 27/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 (3) iled=524ma, pwm on duty=10%, led current de-rating function bd18340fv-m BD18341FV-M op base fb dcdim crt d vin en pbus scp gnd pwmout vreg ntc r fb1 opm r dcdim r opm c vreg c crt r crt c d c vi n2 c vi n1 z d1 pwm_in dc_in d1d2 d3 c led disc r fb2 q1~q3 r dcin u1 figure 31. recommended application circuit 3 (i led 524ma, led white 2strings, pwm on duty 10%(pulse width 0.334ms), pwm frequency 300hz) recommended parts list 3 (i led 524ma, led white 2strings, pwm on duty 10%(pulse width 0.334ms), pwm frequency 300hz) parts no parts name value unit product maker ic u1 bd18340fv-m/BD18341FV-M - - rohm diode d1,d2 rfn2l6s - - rohm d3 rfn1l6s - - rohm z d1 tnr12h-220k - - nippon chemicon pnp tr. q1 to q3 2sar573d - - rohm resistor r fb1 ltr10 series 0.62 ? rohm r fb2 ltr10 series 0.62 ? rohm r crt mcr03 series 3.6 k ? rohm r opm mcr03 series 39 k ? rohm r dcdim mcr03 series 43 k ? rohm ntc ntcg104lh154h 150 k ? tdk r dcin esr10 series 2 k ? rohm capacitor c vin1 gcm32er71h475ka40 4.7 f murata c vin2 gcm188r11h104ka42 0.1 f murata c vreg gcm188r71e105ka49 1.0 f murata c crt gcm188r11h104ka42 0.1 f murata c d gcm188r11h103ka01 0.01 f murata c led gcm188r11h104ka42 0.1 f murata (about z d1 , please place according to test standard of battery line.) downloaded from: http:///
datasheet d a t a s h e e t 28/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 (4) iled=150ma three rows drive pwm on duty=10% led current de-rating function u1 bd18340fv-m BD18341FV-M op base fb dcdim crt d vin en pbus scp gnd pwmout vreg ntc r fb11 opm r dcdim r opm c vreg c crt r crt c d c vi n2 c vin1 z d1 pwm_in dc_in d1d2 d3 c led1 disc r fb12 r lim r dcin r fb21 r fb22 r fb3 1 r fb3 2 c led2 c led3 d4 d5 d6 i led1 i led2 i led3 r 1 r 2 r 3 q 1 q 2 q 3 figure 32. recommended application circuit 4 (i led1~3 150ma led white 2strings 3 pwm on duty 10%( pulse width 0.334ms) pwm frequency 300hz) please refer to application note , about detail the above recommended bd1834x series application circuit 4 downloaded from: http:///
datasheet d a t a s h e e t 29/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 thermal loss thermal design should meet the following equation: / ? / ? ? ? where: p d is the power dissipation p c is the power consumption v in is the vin terminal voltage i vin is the circuit current at normal mode v base is the base terminal voltage i base is the base terminal sink current ja is the thermal resistance of junction to ambient jt is the thermal characterization parameter of junction to centercase surface t jmax is the max joint temperature (150 c) t a is the ambient temperature t t is the case surface temperature downloaded from: http:///
datasheet d a t a s h e e t 30/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 i/o equivalence circuits no. terminal name i/o equivalent circuit no. terminal name i/o equivalent circuit en (15pin ) 150k (typ) 1k(typ) 1333k (typ) gnd (6pin ) vreg (10pin ) gnd (6pin ) pwmout (8pin ) 10 (typ) 380 (typ) gnd (6pin ) pbus (7pin ) vreg (10pin ) 100k(typ) gnd (6pin ) d (12pin ) vreg (10pin ) 100k(typ) gnd (6pin ) disc (14pin ) 5k (typ) gnd (6pin ) crt (13pin ) vreg (10pin ) 100k(typ) gnd (6pin ) opm (9pin ) vreg (10pin ) 10k(typ) opm 9 vreg 10 vin (16pin ) gnd (6pin ) op (4pin) 100k(typ) vin (16pin ) gnd (6pin ) scp (5pin ) 100k(typ) fb 1 base 2 n.c 3 op 4 scp 5 gnd 6 - pbus 7 pwm out 8 11 dcdim 12 d 13 crt 14 disc 15 en vin 16 - gnd (6pin ) dcdim (11pin ) 10 k(typ ) gnd (6pin ) vreg (10pin ) vin (16pin ) 10k(typ) 370k (typ) 92.5k (typ) vin (16pin ) gnd (6pin ) base (2pin) vin (16pin ) gnd (6pin ) fb (1pin) 5.6k(typ) 1k(typ) 1k (typ) 10 (typ) 5.2v (typ) 260k (typ ) 1080k (typ ) 5.2v (typ) 1k(typ) 5.2v (typ ) 143k (typ ) downloaded from: http:///
datasheet d a t a s h e e t 31/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 operational notes 1. reverse connection of power supply connecting the power supply in reverse polarity can damage the ic. take precautions against reverse polarity when connecting the power supply, such as mounting an external diode between the power supply and the ics power supply pins. 2. power supply lines design the pcb layout pattern to provide low impedance supply lines. furthermore, connect a capacitor to ground at all power supply pins. consider the effect of temperature and aging on the c apacitance value when using electrolytic capacitors. 3. ground voltage ensure that no pins are at a voltage below that of t he ground pin at any time, even during transient condition. or 4. ground wiring pattern when using both small-signal and large-current ground traces , the two ground traces should be routed separately but connected to a single ground at the refer ence point of the application board to av oid fluctuations in the small-signal ground caused by large currents. also ensure that the ground trac es of external components do not cause variations on the ground voltage. the ground lines must be as s hort and thick as possible to reduce line impedance. 5. thermal consideration should by any chance the maximum junction temperature rating be exceeded the rise in te mperature of the chip may result in deterioration of the properti es of the chip. in case of exceeding this absolute maximum rating, increase the board size and copper area to prevent exceedin g the maximum junction temperature rating. 6. recommended operating conditions these conditions represent a range within which the expect ed characteristics of the ic can be approximately obtained. the electrical characteristics are guaranteed under the conditions of each parameter. 7. inrush current when power is first supplied to the ic, it is possible that the internal logic may be unstable and inrush current may flow instantaneously due to the internal powering sequence and delays, especially if the ic has more than one power supply. therefore, give special consideration to power c oupling capacitance, power wiring, width of ground wiring, and routing of connections. 8. operation under strong electromagnetic field operating the ic in the presence of a strong electromagnetic field may cause the ic to malfunction. 9. testing on application boards when testing the ic on an application board, connecting a capacitor directly to a low-impedance output pin may subject the ic to stress. always discharge capacitors completely after each process or step. the ics power supply should always be turned off completely before connecting or removing it from the test setup during the inspection process. to prevent damage fr om static discharge, ground the ic during as sembly and use similar precautions during transport and storage. downloaded from: http:///
datasheet d a t a s h e e t 32/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 operational notes C continued 10. inter-pin short and mounting errors ensure that the direction and position are correct when mounting the ic on the pc b. incorrect mounting may result in damaging the ic. avoid nearby pins being shorted to each ot her especially to ground, power supply and output pin. inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and unintentional solder bridge deposited in between pins during assembly to name a few. 11. unused input pins input pins of an ic are often connected to the gate of a mos transistor. the gate has extremely high impedance and extremely low capacitance. if left unconnec ted, the electric field from the out side can easily charge it. the small charge acquired in this way is enough to produce a signifi cant effect on the conduction through the transistor and cause unexpected operation of the ic. so unless otherwise specified, unused in put pins should be connected to the power supply or ground line. 12. regarding the input pin of the ic this monolithic ic contains p+ isolat ion and p substrate layers between adj acent elements in order to keep them isolated. p-n junctions are formed at the intersection of the p layers with the n layers of other elements, creating a parasitic diode or transistor. for example (refer to figure below): when gnd > pin a and gnd > pin b, the p-n j unction operates as a parasitic diode. when gnd > pin b, the p-n junction o perates as a parasitic transistor. parasitic diodes inevitably occur in t he structure of the ic. the operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. therefore, conditions that cause these diodes to operate, such as applying a voltage lower than the gnd voltage to an input pin (and thus to the p substrate) should be avoided. figure 33. example of monolithic ic structure 13. ceramic capacitor when using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with temperature and the decrease in nominal capacitance due to dc bias and others. 14. area of safe operation (aso) operate the ic such that t he output voltage, output current, and the maximum junction temperature rating are all within the area of safe operation (aso). 15. thermal shutdown circuit(tsd) this ic has a built-in thermal shutdown circuit that prevents heat damage to t he ic. normal operation should always be within the ics maximum junction temperature rating. if however the rating is exceeded for a continued period, the junction temperature (tj) will rise which will activate the ts d circuit that will turn off a ll output pins. when the tj falls below the tsd threshold, the circuits are automatically restored to normal operation. note that the tsd circuit operates in a situation that exceed s the absolute maximum rati ngs and therefore, under no circumstances, should the tsd circuit be used in a set desi gn or for any purpose other t han protecting the ic from heat damage. downloaded from: http:///
datasheet d a t a s h e e t 33/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 ordering information b d 1 8 3 4 0 f v - me2 product name package fv: ssop-b16 packaging and forming specification m: high reliability design e2: embossed tape and reel b d 1 8 3 4 1 f v - me2 product name package fv: ssop-b16 packaging and forming specification m: high reliability design e2: embossed tape and reel marking diagrams ssop-b16(top view) 18340 part number marking lot number 1pin mark ssop-b16(top view) 18341 part number marking lot number 1pin mark downloaded from: http:///
datasheet d a t a s h e e t 34/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 physical dimension, tape and reel information package name ssop-b16 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tapequantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin downloaded from: http:///
datasheet d a t a s h e e t 35/35 bd18340fv-m BD18341FV-M ?2016 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 14 ? 001 tsz02201-0t1t0c700180-1-2 2016.04.21 rev.002 revision history date revision changes 2016.03.29 001 new release 2016.04.21 002 page.3 footprints and traces 74.2mm 2 (square) ? 74.2mm x 74.2mm page.12 table of operations operation mode tsd pbus terminal high(4.5v(typ)) to hi-z downloaded from: http:///
notice-paa-e rev.003 ? 201 5 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. if you intend to use our products in devices requiring extreme ly high reliability (such as medical equipment (note 1) , aircraft/spacecraft, nuclear power controllers, etc.) and whose malfunction or failure may cause loss of human life , bodily injury or serious damage to property ( specific applications ), please consult with the rohm sales representative in advance. unless otherwise agreed in writin g by rohm in advance, rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any rohm s products for specific applications. (note1) medical equipment classification of the specific applic ations japan usa eu china class class class b class class ? class 2. rohm designs and manufactures its products subject to stri ct quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adeq uate safety measures including but not limited to fail-safe desig n against the physical injury, damage to any property, whic h a failure or malfunction of our products may cause. the followi ng are examples of safety measures: [a] installation of protection circuits or other protective devic es to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are no t designed under any special or extraordinary environments or conditions, as exemplified below . accordingly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any rohms products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or c onditions (as exemplified below), your independent verification and confirmation of product performance, reliabil ity, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, including water, oils, chemicals, and organi c solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products are e xposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed t o static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing component s, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subject to radiation-proof design. 5. please verify and confirm characteristics of the final or mou nted products in using the products. 6 . in particular, if a transient load (a large amount of load appl ied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mou nting is strongly recommended. avoid applying power exceeding normal rated power; exceeding the power rating u nder steady-state loading condition may negatively affec t product performance and reliability. 7. de -rate power dissipation depending on ambient temperature. wh en used in sealed area, confirm that it is the use in the range that does not exceed the maximum junction temperature. 8 . confirm that operation temperature is within the specified range desc ribed in the product specification. 9 . rohm shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlorine, bromine, etc .) flux is used, the residue of flux may negatively affect prod uct performance and reliability. 2. in principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method mus t be used on a through hole mount products. i f the flow soldering method is preferred on a surface-mount p roducts, please consult with th e rohm representative in advance. for details, please refer to rohm mounting specification downloaded from: http:///
notice-paa-e rev.003 ? 201 5 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, p lease allow a sufficient margin considering variations o f the characteristics of the products and external components, inc luding transient characteristics, as well as static characteristics. 2. you agree that application notes, reference designs, and a ssociated data and information contain ed in this document are presented only as guidance for products use. therefore, i n case you use such information, you are solely responsible for it and you must exercise your own independ ent verification and judgment in the use of such information contained in this document. rohm shall not be in any way respon sible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such informat ion. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take p roper caution in your manufacturing process and storage so t hat voltage exceeding the products maximum rating will not be applied to products. please take special care under dry co ndition (e.g. grounding of human body / equipment / solder iro n, isolation from charged objects, setting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriorate if the products are stored in the places where: [a] the products are exposed to sea winds or corrosive gases, in cluding cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to direct sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage condition, solderabil ity of products out of recommended storage time period may be degraded. it is strongly recommended to confirm so lderability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the correct direction, which is indi cated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a humi dity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage tim e period. precaution for product label a two-dimensional barcode printed on rohm products label is f or rohm s internal use only. precaution for disposition when disposing products please dispose them properly usi ng an authorized industry waste company. precaution for foreign exchange and foreign trade act since concerned goods might be fallen under listed items of export control prescribed by foreign exchange and foreign trade act, please consult with rohm in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to appl ication example contained in this document is for reference only. rohm does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. 2. rohm shall not have any obligations where the claims, a ctions or demands arising from the combination of the products with other articles such as components, circuits, systems or ex ternal equipment (including software). 3. no license, expressly or implied, is granted hereby under any inte llectual property rights or other rights of rohm or any third parties with respect to the products or the information contai ned in this document. provided, however, that rohm will not assert its intellectual property rights or other rights a gainst you or your customers to the extent necessary to manufacture or sell products containing the products, subject to th e terms and conditions herein. other precaution 1. this document may not be reprinted or reproduced, in whole or in p art, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified , reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any way whatsoever the pr oducts and the related technical information contained in the products or this document for any military purposes, includi ng but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. downloaded from: http:///
datasheet datasheet notice ? we rev.001 ? 2015 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. downloaded from: http:///

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