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- 1 - e10632a0y sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illu strating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits. CXA3812M ac-dc controller description the CXA3812M is the current resonant controller ic a nd has optimum configuration to realize various power supply circuits easily and compactly. (applications: power supply circuit, etc.) features ? overcurrent timer latch ? soft start function ? minimum frequency adjustment ? pulse overcurrent load detection ? adjacent 2-pin short protection ? various protection functions including overvoltage and overcurrent structure bicmos silicon monolithic ic package 14-pin sop free datasheet http://
CXA3812M - 2 - absolute maximum ratings *1 allowable power dissipation reduction characteristics recommended operating conditions item symbol ratings unit remarks maximum supply voltage vcc 24.0 v vcc pin voltage which operates with vcc as power supply vccin ?0.3 to vcc + 0.3 v xen driver output pin voltage vout ?0.3 to vcc + 0.3 v outp, outn power supply pin voltage for internal circuit vref ?0.3 to +7.0 v vref pin voltage which operates with vref as power supply vrefin ?0.3 to +7.0 v vsense, offadj, cs1, cs2, rt, ss, fmin allowable power dissipation p d *1 mw (see the thermal derating curve.) operating ambient temperature range topt ?30 to +125 ? c junction temperature tjmax +150 ? c storage temperature range tstg ?55 to +150 ? c allowable power dissipation [mw] when mounted on a four-layer board when mounted on a single layer board operating ambient temperature ta [?c] glass fabric base epoxy board 76 mm 114 mm t = 1.6 mm 0 ?0 20 40 80 60 100 120 140 160 1000 200 400 600 800 297 mw 174 mw 6.6 ?c 65.9 ?c 125 ?c item symbol ratings unit remarks supply voltage (vcc) vcc 12.0 to 18.0 v operating ambient temperature range topt ?25 to +85 ? c junction temperature tj ?25 to +125 ? c free datasheet http://
CXA3812M - 3 - block diagram vcc sgnd outp outn rt ss vref n.c xen vsense offadj rmin cs2 cs1 10 12 11 14 13 9 8 7 1 2 3 4 5 6 band gap reference rm driv cnt rm oscillator fmin control control logic vbgr 1.3 v 11.0 v/9.6 v 5.5 v 8.0 v 5.4 v 4.0 v 4.0 v 2.5 v 1.0 a 250 k 6.0 a +0.175 v +0.22 v ?0.26 v 2.143 v 4.0 v vbgr vbgr vcc enable tsd ng vref tsd stnby normal rm_start rm_stop ng_latch rm_cs2 det rm_cs1 det rm_csng vref_ovlo vref_uvlo uvlo vref_ok vref 5 v vref_ok vcc_ok cs_shift oc_ng oc_ng ng latch drv_outn drv_outp deadband pulse 300 ns vref vref vref 0.1 a free datasheet http://
CXA3812M - 4 - pin configuration pin table 1 2 3 4 6 5 7 14 13 12 11 9 10 8 xen vsense offadj fmin cs2 n.c cs1 outp outn vcc sgnd vref ss rt top view pin no. symbol description connection end of protection diode 1 xen mode select vcc, sgnd 2 vsense operation start voltage input vref, sgnd 3offadj operation stop voltage adjustment and abnormal latch forcible input vref, sgnd 4 fmin minimum frequency adjustment vref, sgnd 5 cs2 overcurrent detection 2 vref 6 cs1 overcurrent detection 1 vref 7n.c ? ? 8 ss soft start and overcurrent timer latch vref, sgnd 9 rt frequency control vref, sgnd 10 vref internal supply voltage output vcc, sgnd 11 sgnd signal gnd ? 12 vcc power supply input sgnd 13 outn fet gate driver output for low ? 14 outp fet gate driver output for high ? free datasheet http://
CXA3812M - 5 - pin description pin no. symbol i/o standard pin voltage equivalent circuit description 1 xen i vcc to gnd mode select (gnd connection: normal operation, vcc connection: standby mode) 2vsense i vref to gnd during steady state: 2.5 v operation start voltage input (connect to pfc output detection resistor.) 3 offadj i vref to gnd operation stop voltage adjustment and abnormal latch forcible input 4 fmin i 1.2 v minimum oscillation frequency control (connect to minimum frequency control resistor.) 5 6 cs2 cs1 i i vref to ?0.3 v overcurrent detection 2 overcurrent detection 1 (connect to current detection resistor.) 1 vcc sgnd nch 2 vref sgnd pch pch 3 vref sgnd pch nch 4 vref sgnd pch nch 5 6 vref sgnd pch pch free datasheet http://
CXA3812M - 6 - 7n.c ? ? ? ? 8 ss i/o vref to gnd during steady state: 2.5 v soft start and overcurrent timer latch (connect to soft start capacitor.) 9 rt i (3.5 v) frequency control 10 vref o 5.0 v internal supply voltage output (connect to photocoupler for output feedback.) 11 sgnd ? ? ? ground 12 vcc ? ? ? power supply input 13 outn o vcc to gnd fet gate driver output for low. (connect to drive transformer.) 14 outp o fet gate driver output for high. (connect to drive transformer.) pin no. symbol i/o standard pin voltage equivalent circuit description nch 8 vref sgnd pch nch nch pch pch pch nch 9 vref sgnd nch 10 vcc sgnd pch nch nch vcc sgnd pch nch 13 14 free datasheet http://
CXA3812M - 7 - electrical characteristics (unless otherwise specified, ta = 27 [ ? c], vcc = 12 [v], xen = gnd, rt = open, rfmin = 120 k ? ) 1. current consumption (vcc pin) 2. under voltage lock out circuit (vcc pin) 3. reference voltage output circuit (vref pin) 4. xen pin voltage detection circuit (xen pin) 5. operation start voltage detection circuit (vsense pin) item symbol measurement conditions min. typ. max. unit current consumption in standby mode istb xen = vcc ? 500 800 ? a current consumption in operation mode iact xen = gnd, vsense = 2.0 v * non switching ?1.52.5ma item symbol measurement conditions min. typ. max. unit operation start voltage vact 10.2 11.0 11.8 v operation stop voltage voff 9.0 9.6 10.2 v hysteresis width vact-voff vact ? voff 1.1 1.4 1.7 v item symbol measurement conditions min. typ. max. unit output voltage vvref 4.85 5.00 5.15 v input stability vline vcc = 10.5 v to 18 v ? 10 30 mv load stability vload iload = 0.1 ma to 5 ma ? 20 50 mv pin voltage for ng latch (for tsd) vvrefng iout = 10 ma (design guarantee) ? 0.1 0.5 v item symbol measurement conditions min. typ. max. unit detection voltage low venl 5.2 ? 5.6 v detection voltage high venh 7.6 ? 8.4 v internal pull-up resistance value ren xen = 0.1 v 35 50 65 k ? item symbol measurement conditions min. typ. max. unit operation start voltage vstart 2.036 2.143 2.250 v operation stop voltage vstop offadj = 1.883 v 1.789 1.883 1.977 v pin pull-up current ivs vsense = 0.1 v 0.05 0.1 0.2 ? a free datasheet http://
CXA3812M - 8 - 6. stop voltage adjustment circuit (offadj pin) 7. gate drive circuit (outp, outn pins) *1 rise time and fall time use vcc ? 0.1 to vcc ? 0.9 as judgment voltages. 8. soft start circuit (ss pin) 9. frequency control circuit (rt pin) 10. minimum frequency adjustment circuit (fmin pin) item symbol measurement conditions min. typ. max. unit latch voltage for external abnormal detection voffadjng 3.8 4.0 4.2 v item symbol measurement conditions min. typ. max. unit output low voltage voutl vcc = 18 v, iout = +10 ma ? 0.05 0.1 v output high voltage vouth vcc = 18 v, iout = ?10 ma 17.9 17.95 ? v rise time *1 voutr vcc = 18 v, cload = 1000 pf ? 35 100 ns fall time *1 voutf vcc = 18 v, cload = 1000 pf ? 35 100 ns item symbol measurement conditions min. typ. max. unit soft start current iss ss = 0 v 7.5 10 12.5 ? a clamp voltage vss 2.3 2.5 2.7 v overcurrent timer latch detection voltage vtimerlatch 3.8 4.0 4.2 v charge current for overcurrent detection iocc cs1 = 0.3 v, ss = 3.0 v 3.2 5.0 6.8 ? a item symbol measurement conditions min. typ. max. unit maximum oscillation frequency fmax irt = 2 ma, rfmin = 39 k ? 800 ? ? khz deadband width tdb 270 300 330 ns clamp frequency magnification during soft start fclamp f0/f4 (f0: rm_ss = 0 v, f4: rm_ss = open) rfmin = 390 k ? 3.5 4.0 4.5 times item symbol measurement conditions min. typ. max. unit setting frequency 1 fmin1 rfmin = 390 k ? ?3 % 46.1 +3 % khz setting frequency 2 fmin2 rfmin = 120 k ? ?4 % 96.7 +4 % khz setting frequency 3 fmin3 rfmin = 39 k ? ?5 % 144.1 +5 % khz pin low current detection lcdet 0.85 1.25 1.65 ? a free datasheet http://
CXA3812M - 9 - 11. overcurrent detection circuit 1 (cs1 pin) 12. overcurrent detection circuit 2 (cs2 pin) note) ? shipping inspection is performed at room temperature. (the design is guaranteed with respect to temperature fluctuation.) ? the notation ? ? ? of applied current shown in the measurement conditions indicates that ??? is outflow current from the ic and ?+? is inflow current to it. item symbol measurement conditions min. typ. max. unit positive side detection vcs1p when rm_outp = high 0.209 0.220 0.231 v negative side detection vcs1n when rm_outn = high ?0.295 ?0.260 ?0.235 v detection delay time tcsdly cs to drv rm_cs = ?0.3 v ? 0.3 v (rectangular wave input) 100 150 200 ns detection mask time tcsmask rm_cs = 0.3 v 384 480 576 ns overcurrent detection voltage ratio for +b drop rrmocp vsense < 2.143 v 10 15 20 % item symbol measurement conditions min. typ. max. unit continuous load detection voltage vcs2 when rm_outp = high 0.158 0.175 0.193 v detection mask time tcsmask rm_cs = 0.3 v 384 480 576 ns continuous load detection time tcs2 (when the time corresponds to 2.1 s ? 5 times) (10) s free datasheet http://
CXA3812M - 10 - 13. list of electrical characteristics item specification ratings (ta = 27 ? c) design guarantee ratings (ta = ?25 to +85 ? c) ( *1 ) unit min. typ. max. min. typ. max. current consumption (vcc pin) current consumption in standby current ? 500 800 ? 500 800 ? a current consumption in operation mode ? 1.5 2.5 ? 1.5 2.5 ma low voltage misoperation prevention circuit (vcc pin) operation start voltage 10.2 11 11.8 10.2 11 11.8 v operation stop voltage 9 9.6 10.2 9 9.6 10.2 v hysteresis width 1.1 1.4 1.7 1.1 1.4 1.7 v reference voltage output (vref pin) output voltage 4.85 5 5.15 4.85 5 5.15 v input stability ? 10 30 0 10 30.5 ( *2 )mv load stability ? 20 50 ? 20 50 mv pin voltage for ng latch (when tsd) ? 0.1 0.5 ? 0.1 0.5 v mode select circuit (xen pin) detection voltage low 5.2 ? 5.6 5.2 ? 5.6 v detection voltage high 7.6 ? 8.4 7.6 ? 8.4 v internal pull-up resistor value 35 50 65 35 50 65 k ? operation start voltage det ection circuit (vsense pin) operation start voltage 2.036 2.143 2.250 2.036 2.143 2.250 v operation stop voltage 1.789 1.883 1.977 1.789 1.883 1.977 v pin pull-up current 0.05 0.1 0.2 0.05 0.1 0.2 ? a stop voltage adjustment circuit (offadj pin) latch voltage for external abnormal detection 3.8 4 4.2 3.8 4 4.2 v output circuit (outp, outn pins) output low voltage ? 0.05 0.1 ? 0.05 0.1 v output high voltage 17.9 17.95 ? 17.9 17.95 ? v rise time ? 35 100 ? 35 100 ns fall time ? 35 100 ? 35 100 ns soft start circuit (ss pin) soft start current 1 7.5 10 12.5 7.5 10 12.5 ? a soft start current 2 4.69 6.25 7.81 4.69 6.25 7.81 ? a clamp voltage 2.3 2.5 2.7 2.3 2.5 2.7 v overcurrent timer latch detection voltage 3.8 4 4.2 3.8 4 4.2 v charge current for overcurrent detection 3.2 5.0 6.8 3.2 5.0 6.8 ? a free datasheet http://
CXA3812M - 11 - *1 ratings are design guarantee values within this temperature range. *2 specification values at room temperature may not be satisfied because of temperature dependence. frequency control circuit (rt pin) maximum oscillation frequency 800 ? ? 800 ? ? khz deadband width 270 300 330 270 300 330 ns clamp frequency magnification during soft start 3.5 4.0 4.5 3.5 4.0 4.5 times minimum frequency adjustment circuit (fmin pin) setting frequency 1 ?3.0 % 46.1 +3.0 % ?3.8 % ( *2 ) 46.1 +3.0 % ( *2 ) khz setting frequency 2 ?4.0 % 96.7 +4.0 % ?4.7 % ( *2 ) 96.7 +4.0 % ( *2 ) khz setting frequency 3 ?5.0 % 144.1 +5.0 % ?5.6 % ( *2 ) 144.1 +5.0 % ( *2 ) khz constant current detection threshold value 0.85 1.25 1.65 0.85 1.25 1.65 ? a overcurrent circuit (cs1 pin) positive side detection 0.209 0.220 0.231 0.209 0.220 0.231 v negative side detection ?0.295 ?0.260 ?0.235 ?0.295 ?0.260 ?0.235 v overcurrent detection voltage ratio for +b drop 10 15 20 10 15 20 % detection delay time 100 150 200 100 150 200 ns detection mask time 384 480 576 384 480 576 ns overcurrent detection circuit (cs2 pin) continuous load detection voltage 0.158 0.175 0.193 0.158 0.175 0.193 v detection mask time 384 480 576 384 480 576 ns continuous load detection time (10) (10) s item specification ratings (ta = 27 ? c) design guarantee ratings (ta = ?25 to +85 ? c) ( *1 ) unit min. typ. max. min. typ. max. free datasheet http://
CXA3812M - 12 - detailed descripti on of each block 1. misdetection prevention circuit fig. 1. equivalent circuit of 1 ms ? 3 times-sampling chatter filter fig. 1 above shows the equivalent circuit of 1 ms ? 3 times-sampling chatter filter. when clk has a 1 ms cycle, comp out is monitored at the rising edge of every 1 ms, and the output q is defined when it reaches three times. the other chatter filters also operate using a similar circuit. the clocks used for each setup time are generated by frequency dividing the 1 mhz clock. the setup time variance of the 1 ms ? 3 times chatter filter in the example above is as follows. variance of 2 ms < setup time < 3 ms occurs due to the comp out inversion timing. in addition, taking into account the basic clock 1 khz variance, the 1 ms (1024 ? s) clock has variance of 0.972 ms to 1.075 ms ( ? 5 %), so at the maximum variance the setup time variance is 1.944 ms < setup time < 3.225 ms. setup time of misdetection prevention counter (when the basic clock of 1 mhz has no variance) used for this ic is shown below. ? corresponds to 32 ? s ? 3 times .................... 64 ? s to 96 ? s ? corresponds to 128 ? s ? 5 times .................. 512 ? s to 640 ? s ? corresponds to 1 ms ? 3 times ..................... 2 ms to 3 ms (converted by 1 ms for 1.024 ms) ? corresponds to 1 ms ? 5 times ..................... 4 ms to 5 ms ? corresponds to 8 ms ? 6 times ..................... 40 ms to 48 ms (converted by 16 ms for 16.4 ms) ? corresponds to 2.1 s ? 3 times ..................... 4.2 s to 6.3 s (converted by 2.1 s for 2.097 s) ? corresponds to 2.1 s ? 5 times ..................... 8.4 s to 10.5 s q comp out clk q ck dq qck dq qck dq q s r q q comp out clk free datasheet http://
CXA3812M - 13 - 2. xen pin voltage detection circuit normal sequence mode and standby mode can be set in accordance with the xen pin input voltage. normal sequence mode can be set by short-circuiting the xen pin to gnd, and standby mode can be set by short-circuiting the xen pin to vcc or leaving the pin open. note that this ic has a test mode for minimum frequency setting. the output pin can be forcibly operated by setting the xen pin voltage to the voltage shown below. 5.6 v < xen pin voltage < 7.6 v in addition, the mode transition setup times when the xen pin voltage is switched are as follows. transition to test mode can be enabled only in standby mode. ? normal sequence mode ? standby mode : 32 ? s ? 3 times ? standby mode ? normal sequence mode : 32 ? s ? 3 times ? standby mode ? test mode : 1 ms ? 3 times ? test mode ? standby mode : 1 ms ? 3 times free datasheet http://
CXA3812M - 14 - 3. operation start voltage detection circuit fig. 2 shows the equivalent circuit for vsense pin. fig. 2. equivalent circuit for oper ation start voltage detection block the vsense pin controls the operation start/stop. ? operation start voltage controller operation starts when vsense > 2.143 v is detected, corresponding to 8 ms ? 6 times. ? operation stop voltage controller operation stops when vsense < of fadj is detected, corresponding to 1 ms ? 5 times. the circuit connected to this pin operates at all time after the power-on reset is released. even if a high signal is input to the xen pin, the circuit operates, the 8 ms ? 6 times chatter filter also operates. if a low signal is input to the xen pin after condition where the vsense pin voltage i s 2.143 v or more is counted up, the operation starts immediately. vref vsense r1 vout (+b) r2 0.1 a 2.143 v offadj operation start operation stop free datasheet http://
CXA3812M - 15 - 4. oscillator block 4-1. oscillator circuit fig. 3. oscillator equivalent circuit fig. 3 shows the equivalent circuit for oscillator circuit. outputs of some current mirror circuits are connect ed to internal timing capacitor, discharge switch , and positive input of comparator. the resonant oscillati on frequency is determined by the current led from the rm_rt pin, the current from the minimum frequency se tting circuit, and the current from the soft start circuit. the deadband width is fixed internally to 300 ns. the fig. 4 graph shows the resonant oscillation fr equency response at a minimum frequency setting of 46.1 khz, relative to the current led from the rm_rt pin. fig.4. resonant oscillation frequency rt 2.4 v cs1_ng s r q q deadband 300 ns n p vref in irt ss_current fmin_current outp outn pulse distribution outn driver outp driver frequency (rm_out) [khz] rm_rt current [a] 0 50 100 150 200 250 300 350 400 0 50 100 150 200 resonant oscillation frequency when rfmin = 390 k connected (46.1 khz setting) free datasheet http://
CXA3812M - 16 - 4-2. minimum frequency setting circuit fig. 5. equivalent circuit for minimum frequency control block fig. 5 shows the equivalent circuit for minimum frequency control block. the minimum resonant frequency can be set by externally connecting a resistor to the rm_fmin pin. the fig. 6 graph shows the minimum frequency respons e relative to the external resistor value. fig. 6. minimum oscillation frequency setting the minimum oscillation frequency decreases when the rm _fmin pin is left open or the current led from the pin decreases. ic latch operation forcibly results when the current led from the pin is detected as being continuously 1.25 ? a or less (lc_det) for 6 s (2.1 s ? 3 times). this pin voltage becomes 925 k ? by converting to a resistance value connected to the pin. connect a resistor of 700 k ? or less to the rm_fmin pin, considering a margin to the ic variance. 1.2 v fmin vref i fmin 0.05 oc [3:0] cs1_ng to osc i fmin ocp/zcs control logic i fmin_lc lc_det fmin frequency response 0 0 100 200 300 400 20 40 60 80 100 120 140 160 180 200 freqency (rm_out) [khz] r (rm_fmin) [k ] free datasheet http://
CXA3812M - 17 - 4-3. soft start circuit fig. 7. equivalent circuit for soft start control block fig. 7 shows the equivalent circuit for soft start block. the soft start circuit feeds back the current, determined by the internal 2.5 v output, the ic internal resistance (rss), and the external capacitor, to the oscillator of the resonant controller. this enables to start oscillation from a high frequency during resonant start-up. the rss value is 400 k ? in active standby mode and 250 k ? in high-speed startup mode. in addition, the maximum frequency during soft start is limited to 4 times (max.) the minimum frequency determined by the rm_fmin pin external resistor. note that the frequency other than during soft start is not limited to 4 times the minimum frequency. in these cases the frequency is controlled according to the current led from the rm_rt pin. the fig. 8 graph shows the resonant oscillation frequency response during soft start. fig. 8. oscillation frequency during soft start 2.5 v ss vref 4.0 v timer latch 1.0 a rss oc_ng 6.0 a osc oscillation frequency during resonant soft start i (rm_rt) = 0 a v (rm_ss) [v] frequency (rm_out) [khz] 0 100 200 300 400 500 600 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 fmin = 46.1 khz fmin = 96.7 khz fmin = 144.1 khz free datasheet http://
CXA3812M - 18 - 5.overcurrent detection circuit fig. 9. equivalent circuit for overcurrent detection block fig. 9 shows the equivalent circuit fo r resonant overcurrent detection block. the voltage between the rm_cs and gnd pins is monitored, and overcurrents in both the positive (+0.22 v) and negative (?0.26 v) directions are detected according to rm_outp and rm_outn pin operation. when the pfc output voltage lowers (pfc_vsense < 2.143 v), the resonant overcurrent threshold voltage is switched to 1.15 times that in normal state both for positive and negative directions; +0.253 v for positive direction and ?0.299 v for negative direction. operation in overcurrent detection mode is as shown in fig. 10. when an overcurrent is detected, regardless of positive or negative direction, the output pulse is forcibly turned off by pulse-by-pulse control. in addition, when an overcurrent is detected, the minimum oscillation frequency is controlled to 1.2 times the setting value. thereafter, the minimum oscillation frequency limit changes in the order of 1.2 times ? 1.15 times ? 1.1 times ? 1.05 times ? 1.0 times the setting value with each deadband pulse, and control is performed to return to the original setting frequency with each pulse (4 steps). the minimum oscillation frequency is controlled to 1.2 times the setting value in this manner each time an overcurrent is detected again during the frequency limit period. in addition, in overcurrent detection mode, the capacitor connected to the rm_ss pin is charged by approximately 5.0 ? a, and when the rm_ss pin voltage reaches 4.0 v (128 ? s ? 5 times), the ic is ng latched and the output goes off (both the rm_outp and rm_out n pins output low). (timer latch operation) approximately 1.0 ? a is constantly discharged from the rm_ss pin to the inside of the ic, so when the overcurrent is canceled partway, the rm_ss pin is discharged until the clamp voltage is reached. 0.22 v 0.175 v vref cs1_det (?0.26 v) cs1_det (+0.22 v) cs2_det (+0.175 v) cs1_det gnd rm_cs2 rm_cs1 free datasheet http://
CXA3812M - 19 - fig. 10. operating waveform in overcurrent detection mode fig. 9 also shows the circuit which monitors the voltage between rm_cs2 and gnd pins and detects the continuous pulse overcurrent (cs2_det: +0.175 v detection). operation in continuous overcurrent detection mode differs from the operation shown in fig. 10, and instead normal operation continues. when cs2 overcurrent detection continues for approximately 10 s (set up by 2.1 s ? 5 times), ng latch results and the ic forcibly stopped. when cs2 overcurrent is not detected for even one cycle during the approximately 10 s count, the counter is reset. then, when an overcurrent is detected again, the 10 s counter starts from zero. outp outn dbpulse resonant current ss charge period minimum resonant oscillation frequency fmin fmin 1.2 cs1 det pulse-by-pulse control positive detection +220 mv negative detection ?250 mv free datasheet http://
CXA3812M - 20 - 6.operation stop voltage detection block fig. 11 offadj pin intern al equivalent circuit fig. 11 shows the offadj pin internal equivalent circuit. the operation stop voltage is determined by the offadj pin setting voltage. when the vsense pin is set to the voltage lower than the offadj pin voltage, the operation stops. the offadj pin voltage can be set to an arbitrary value by adding the circuit enclosed by the red dotted line shown in fig. 11. this pin has an abnormal latch detection function that activates at 4.0 v or more, so the ic can be forcibly set to latch operation using the secondary overvoltage detecti on or other signal by externally adding the circuit enclosed by the blue dotted line in fig. 11. resonant circuit stop (1 ms 5 times) timer latch signal (128 s 5 times) 4.0 v offadj vsense vref external latch signal free datasheet http://
CXA3812M - 21 - 7. ng latch operation ? cs1 overcurrent timer latch when cs1 > 0.22 v or cs1 < ?0.25 v is detected, the rm_ss pin is charged by a charging current of 1.25 ? a. latch operation results after ss > 4.0 v is detected and set up by 128 ? s ? 5 times. ? cs2 continuous overcurrent latch latch operation results after cs2 > 0.175 v is detected continuously and set up by 2.1 s ? 5 times. ? tsd (ic overheat) latch latch operation results immediately afte r a chip temperature of approximately 140 ? c is detected. ? offadj latch latch operation results after offadj > 4.0 v is detected and set up by 128 ? s ? 5 times. ? other latch latch operation results after any of the following operations are detected and set up by 2.1 s ? 3 times. ? vref_ovlo detection: 5.5 v or more ? fmin pin low current: 125 ? a or less circuit operation stops after ng latch, but the vref pin continues to output high. ng latch is canceled by transitioning to standby mode. however, during tsd latch the vref pin outputs low, and the tsd latch state is canceled only by turning the ic power off and on again, or by detecting vcc uvlo (vcc < 9.6 v). free datasheet http://
CXA3812M - 22 - timing chart xen h (standby) l (active) l 0 v h/l t2 t2 t1 t1 t3 2.5 v 2.143 v 2.143 v offadj vsense outp/outn rm_ss t1: corresponds to 32 s 3 times t2: corresponds to 8 ms 6 times t3: corresponds to 1 ms 5 times free datasheet http://
CXA3812M - 23 - application circuit ? + vsense vref 1 2 3 4 6 5 7 14 13 12 11 9 10 8 xen vsense offadj fmin cs2 nc cs1 outp outn vcc sgnd vref ss rt nch nch regulator photo coupler application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. free datasheet http://
CXA3812M - 24 - example of representative characteristics vref output voltage vcc = 12 v 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 ?30 ?5 20 45 70 95 120 vref [v] current consumption in standby mode vcc = 12 v 0 300 200 100 400 500 600 700 800 900 ?30 ?5 20 45 70 95 120 current consumption in standby mode [a] vcc_uvlo hysteresis voltage 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 ?30 ?5 20 45 70 95 120 hysteresis voltage [v] temp [?c] temp [?c] vcc_uvlo operation stop voltage 8.8 9.0 9.2 9.4 9.6 9.8 10.0 10.2 10.4 ?30 ?5 20 45 70 95 120 operation stop voltage [v] temp [?c] temp [?c] vcc_uvlo operation start voltage 10.0 10.4 10.8 11.2 11.6 12.0 ?30 ?5 20 45 70 95 120 operation start voltage [v] temp [?c] current consumption in operation mode vcc = 12 v no switching 0.0 1.0 0.5 1.5 2.5 2.0 3.0 ?30 ?5 20 45 70 95 120 current consumption in operation mode [ma] temp [?c] free datasheet http://
CXA3812M - 25 - pfc_vsense resonant stop voltage 1.75 1.80 1.85 1.90 1.95 2.00 ?30 ?5 20 45 70 95 120 pfc_vsense resonant stop voltage [v] temp [?c] xen detection low voltage 5.0 5.3 5.2 5.1 5.4 5.5 5.6 5.7 ?30 ?5 20 45 70 95 120 xen detection low voltage [v] temp [?c] pfc_vsense resonant start voltage 2.00 2.10 2.05 2.15 2.20 2.25 2.30 ?30 ?5 20 45 70 95 120 pfc_vsense resonant start voltage [v] temp [?c] rm_offadj external abnormal detection voltage 3.7 3.8 3.9 4.0 4.1 4.2 4.3 ?30 ?5 20 45 70 95 120 rm_offadj external abnormal detection voltage [v] temp [?c] xen detection high voltage 7.4 7.6 7.8 8.0 8.2 8.4 8.6 ?30 ?5 20 45 70 95 120 xen detection high voltage [v] temp [?c] rm_out output high voltage vcc = 18 v 17.85 17.90 17.95 18.00 ?30 ?5 20 45 70 95 120 rm_out output high voltage [v] temp [?c] free datasheet http://
CXA3812M - 26 - rm_out output low voltage vcc = 18 v 0.00 0.05 0.10 0.15 ?30 ?5 20 45 70 95 120 rm_out output low voltage [v] temp [?c] rm_out rise time vcc = 18 v 0 20 40 60 80 100 120 ?30 ?5 20 45 70 95 120 rm_out rise time [ns] temp [?c] rm_ss charge current during overcurrent 0 2 4 6 8 10 ?30 ?5 20 45 70 95 120 rm_ss charge current during overcurrent [a] temp [?c] rm_out fall time vcc = 18 v 0 20 40 60 80 100 120 ?30 ?5 20 45 70 95 120 rm_out fall time [ns] temp [?c] rm_ss clamp voltage 2.2 2.3 2.4 2.5 2.6 2.7 2.8 ?30 ?5 20 45 70 95 120 rm_ss clamp voltage [v] rm_ss charge current 0 5 10 15 20 ?30 ?5 20 45 70 95 120 rm_ss charge current [a] temp [?c] temp [?c] free datasheet http://
CXA3812M - 27 - rm_fmin minimum oscillation frequency setting 2 90 92 98 96 94 104 102 100 ?30 ?5 20 45 70 95 120 rm_fmin minimum oscillation frequency setting 2 [khz] temp [?c] rm_fmin minimum oscillation frequency setting 3 130 135 140 145 150 155 ?30 ?5 20 45 70 95 120 rm_fmin minimum oscillation frequency setting 3 [khz] temp [?c] rm_rt maximum resonant oscillation frequency 700 800 900 1000 1100 ?30 ?5 20 45 70 95 120 rm_rt maximum resonant oscillation frequency [khz] temp [?c] rm_rt deadband width 260 270 300 290 280 310 320 330 340 ?30 ?5 20 45 70 95 120 rm_rt deadband width [s] temp [?c] rm_rt clamp frequency magnification during soft start 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 ?30 ?5 20 45 70 95 120 rm_rt clamp frequency magnification during soft start temp [?c] rm_fmin minimum oscillation frequency setting 1 40 42 44 46 48 50 ?30 ?5 20 45 70 95 120 rm_fmin minimum oscillation frequency setting 1 [khz] temp [?c] free datasheet http://
CXA3812M - 28 - rm_cs2 continuous overcurrent detection voltage 0.15 0.16 0.17 0.18 0.19 0.20 ?30 ?5 20 45 70 95 120 rm_cs2 continuous overcurrent detection voltage [v] temp [?c] 350 400 450 500 550 600 ?30 ?5 20 45 70 95 120 temp [?c] rm_cs1 overcurrent mask time rm_cs1 overcurrent mask time [ns] rm_cs1 positive overcurrent detection voltage 0.20 0.21 0.22 0.23 0.24 ?30 ?5 20 45 70 95 120 rm_cs1 positive overcurrent detection voltage [v] temp [?c] rm_cs1 negative overcurrent detection voltage rm_cs1 negative overcurrent detection voltage [v] ?30 ?5 20 45 70 95 120 temp [?c] ?0.30 ?0.22 ?0.23 ?0.24 ?0.25 ?0.26 ?0.27 ?0.28 ?0.29 rm_cs1 overcurrent detection delay time (rectangular wave input) 80 100 120 140 160 200 180 220 ?30 ?5 20 45 70 95 120 rm_cs1 overcurrent detection delay time [ns] temp [?c] rm_cs1 overcurrent detection delay time (sine wave input: 90 khz) reference data (design guarantee) 100 150 200 250 300 350 400 ?30 ?5 20 45 70 95 120 rm_cs1 overcurrent detection delay time [ns] temp [?c] free datasheet http://
CXA3812M - 29 - rm_cs1 offset current 6 7 8 9 10 11 12 13 ?30 ?5 20 45 70 95 120 rm_cs1 offset current [a] temp [?c] free datasheet http://
CXA3812M - 30 - package outline (unit: mm) sdt: 875337235 14pin sop (plastic) 9.9 ? 0.1 + 0.4 0.45 0.1 1.27 7.9 0.4 + 0.3 m 0.24 sony code eiaj code jedec code package structure package material lead treatment lead material package mass epoxy resin solder plating 42/copper alloy sop-14p-l01 sop014-p-0300 0.2g 17 14 8 1.85 ? 0.15 + 0.4 0.2 ? 0.05 + 0.1 0.1 + 0.2 ? 0.05 6.9 0.15 0.5 0.2 5.3 ? 0.1 free datasheet http://
CXA3812M - 31 - sony corporation aoi: 875337236 free datasheet http://

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