1/4 rev. a structure silicon monolithic integrated circuit name of product dc-ac inverter control ic type ? function 1ch control with push-pull lamp current and voltage sense feed back control sequencing easily achieved with soft start control short circuit protection with timer latch under voltage lock out short circuit protection with over voltage mode-selectable the operating or stand-by mode by stand-by p in burst mode controlled by pwm and dc input absolute maximum ratingsta = 25 parameter symbol limits unit supply voltage v cc 1 5 v operating temperature range topr -35+95 storage temperature range tstg -55+125 power dissipation pd 562 * m w maximum junction temperature tjmax +150 * pd derated at 4.5mw/ for temperature above ta = 25 (when mounted on a pcb 70.0mm70.0mm1.6mm) recommended operating condition status of this document the japanese version of this document is the official specification. please use the translation version of this document as a reference to expedite understanding of the official version. if these are any uncertainty in translation version of this document, official version takes priority. parameter symbol limits unit supply voltage vcc 4.514.0 v drive output frequency f out 20150 khz bct oscillation frequency f bct 0.100.50 khz www.datasheet.in
2/4 rev. a electric characteristicsta=25vcc=7v parameter symbol limits unit conditions min. typ. max. whole device operating current i cc 1 8 16 ma stand-by current i cc 2 2 10 a over voltage detect fb over voltage detect voltage vovf 2.20 2.40 2.60 v stand-by control stand-by voltage h1 high active vsth1 2.3 vcc v system on duty pin0.5v2.0v burst dimming100%0% stand-by voltage h2 low active vsth2 1.4 2.1 v system on duty pin0.5v2.0v burst dimming0%100% stand-by voltage l vstl -0.3 0.8 v system off timer latch timer latch voltage v scp 1.9 2.0 2.1 v timer latch current i scp 0.5 1.0 1.5 a osc block active edge current iact 1.25/rt 1.5/rt 1.75/rt a max duty maxduty 44 46.4 49 % f out =60khz soft start current iss 1.0 2.0 3.0 a is comp detect voltage visc 0.45 0.50 0.55 v ss comp detect voltage vss 2.0 2.2 2.4 v srt on resistance r srt 200 400 uvlo block operating voltage vuvloh 4.13 4.30 4.47 v shut down voltage vuvlol 3.94 4.10 4.26 v feed back block is threshold voltage vis 1.225 1.250 1.275 v vs threshold voltage vvs 1.220 1.250 1.280 v is source current 1 iis1 1.5 a duty=2.0v is source current 2 iis2 13.0 20.0 27.0 a duty=0vis=0.5v vs source current ivs 1.0 a output block n1ch output voltage h voutn1h v cc -0.3 v cc -0.1 v n2ch output voltage h voutn2h v cc -0.3 v cc -0.1 v n1ch output voltage l voutn1l 0.1 0.3 v n2ch output voltage l voutn2l 0.1 0.3 v n1ch sink resistance rsinkn1 4 8 isink = 10ma n1ch source resistance rsourcen1 7 14 isource = 10ma n2ch sink resistance rsinkn2 4 8 isink = 10ma n2ch source resistance rsourcen2 7 14 isource = 10ma drive output frequency f out 58.5 60.0 61.5 khz rt=29.2k burst mode bosc max voltage vburh 1.94 2.0 2.06 v f bct =0.2khz bosc min voltage vburl 0.4 0.5 0.6 v f bct =0.2khz bosc frequency f bosc 252.2 260 267.8 hz bct=46420pf comp block over voltage detect v comp h 1.92 2.00 2.08 v under voltage detect v comp l 0.96 1.00 1.04 v hysteresis width Sv comp 0.1 0.15 v this product is not designed for normal operation with in a ra dio active environment. www.datasheet.in
3/4 rev. a package dimensions block diagram pin description pin no. pin name function 1 rt external resistor from rt to gnd for adjusting the internal triangle oscillator 2 srt external resistor from srt to rt for adjusting the internal triangle oscillator 3 fb error amplifier output 4 is error amplifier input 5 vs error amplifier input 6 gnd ground 7 duty control pwm mode and burst mode 8 bct external capacitor from bct to gnd for adjusting the burst triangle oscillator 9 comp under, over voltage detect 10 scp external capacitor from scp to gnd for timer latch 11 ss external capacitor from ss to gnd for soft start control 12 stb stand-by switch select the burst dimming direction 13 n2 fet driver 14 pgnd ground for fet drivers 15 n1 fet driver 16 vcc supply voltage input device mark bd9893 f lot no. sop16 (unit:mm) stb block system on/off - + - + f/b block reg block - + vcc vcc uvlo pwm block logic block output block osc bosc - + protect block vs is ss rt bct duty vcc n1 n2 pgnd comp scp srt stb fb is vs reg gnd 1.25v 1.25v (include burr : 10.35) www.datasheet.in
4/4 rev. a note for use when designing the external circuit, including adequate marg ins for variation between external devices and the ic.use adequate margins for steady state and transient characteristics . recommended operating range the circuit functionality is guaranteed within of ambient temperature operation range as long as it is within recommended operating range. the standard electrical characteristic values cannot be guaranteed at other voltages in the operating ranges, however the variation will be small. mounting failures, such as misdirection or miscounts, may harm the device. a strong electromagnetic field may cause the ic to malfuncti on. . the gnd pin should be the location within 0.3v compared with the pgnd pin the BD9893F incorporate a built-in thermal shutdown circuit (tsd circuit). the thermal shutdown circuit (tsd circuit) is designed only to shut the ic off to prevent runaway thermal operation. it is not designed to protect the ic or guarantee its operation. do not continue to use the ic after operating this circuit or use the ic in an environment where the operation of the thermal shutdown circuit is assumed. absolute maximum ratings are those values that, if exceeded, may cause the life of a device to become significantly shorten ed. moreover, the exact failure mode caused by short or open is not defined. physical countermeasures, such as a fuse, need to be considered when using a device beyond its maximum ratings . about the external fet, the parasitic capacitor may cause th e gate voltage to change, when the drain voltage is switching. make sure to leave adequate margin for this ic variation. on operating slow start control (ss is less than 2.2v), it does not operate timer latch. by stb voltage, BD9893F are changed to 3 states. therefore, do not input stb pin voltage between one state and the other state (0.81.4v, 2.12.3v). the pin connected a connector need to connect to the resistor for electrical surge destruction. this ic is a monolithic ic which (as shown is fig-1)has p + substrate and between the various pins. a p-n junction is formed from this p layer of each pin. for example, the relation between each potential is as follows, (when gnd > pinb and gnd > pina, the p-n junction operates as a parasitic diode.) (when pinb > gnd > pina, the p-n junction operates as a parasitic transistor.) parasitic diodes can occur inevitably in the structure of the ic. the operation of parasitic diodes can result in mutual interference among circuits as well as operation faults and physical damage. accordingly you must not use methods by which parasitic diodes operate, such as applying a voltage that is lower than the gnd (p substrate) voltage to an input pin. fig-1 simplified structure of a bipolar ic p substrate parasitic diode gnd n p p resistance transistor (npn) other adjacent components parasitic diode (pinb) (pina) p gnd p substrate gnd n n b c e n n (pina) (pinb) parasitic diode gnd gnd parasitic diode c b e www.datasheet.in
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