unisonic technologies co., ltd 93334 linear integrated circuit www.unisonic.com.tw 1 of 4 copyright ? 2014 unisonic technologies co., ltd qw-r121-006.c high energy ignition circuit ? description this device is designed to use t he signal from a reluctor type ignition pickup to produce a well controlled output from a power darlington output transistor. ? features * very low peripheral component count * no critical system resistors * wide supply voltage operating range (4.0v ~ 24v) * overvoltage shutdown (30v) * dwell automatically adjusts to produce optimum stored energy without waste * externally adjustable peak current * transient protect ed inputs and outputs sop-8 ? ordering information ordering number package packing 93334G-S08-R sop-8 tape reel note: pin assignment: g: gate d: drain s: source ? marking
93334 linear integrated circuit unisonic technologies co., ltd 2 of 4 www.unisonic.com.tw qw-r121-006.c ? pin configuration ? block diagram and typical application component values pickup series resistance = 800 ? 10% @ 25 , inductance= 1.35h @ 1.0khz @ 15vrms coil leakage l=0.6mh, primary r=0.43 ? 5% @ 25 , primary l=7.5mh ~ 8.5mh @ 5.0a r l load resistor for pickup=12k ? 20% r 1 , r 2 input buffer resistors provide additional tr ansient protection to the already clamped inputs=20k20% c 1 , c 2 for reduction of high frequency noise and spark transients induced in pick-up and leads; optional and non-critical r bat provides load dump protection (but small enough to allow operation at v bat =4.0v) =300 ? 20% cfilter transient filter on v cc , non-critical c dwell stores reference, circuit designed for 0.1 f20% r gain r gain /r d1 sets the dc gain of the current regulator =5.0k20% r d2 r d2 /r d1 set up voltage feedback from r s r s sense resistor (p d a g in thick film techniques) =0.075 ? 30% r drive low enough to supply drive to the output darlington, high enough to keep v ce(sat) of the i c below darlington turn-on during load dump = 100 ? 20%, 5.0w r d1 starting with 35 ? assures less than 5.5a, increasing as required to set 5.5a r d1 =(i o ( peak ) r s ? v ref )/((v ref /r d2 )-(1.4/r gain ))-( 100 ? )
93334 linear integrated circuit unisonic technologies co., ltd 3 of 4 www.unisonic.com.tw qw-r121-006.c ? absolute maximum ratings parameter symbol ratings unit power supply voltage-steady st ate transient 300ms or less v cc 24 v 90 output sink current-steady st ate transient 300ms of less i out(sink) 300 ma 1.0 a power dissipation derate above 25 ? c p d 1.05 w 12 mw/ ? c junction temperature t j +125 ? c operating temperature t opr -40~+125 ? c storage temperature t stg -40 ~ 150 ? c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. ? electrical characteristics (v cc = 13.2v dc , circuit of figure 3, unless otherwise specified) parameter symbol test conditions min typ max unit internal supply voltage, pin 6 v cc v bat =4.0v dc 3.5 v dc v bat =8.0v dc 7.2 v bat =12.0v dc 10.4 v bat =14.0v dc 11.8 ignition coil current peak, cranking rpm 2.0hz ~ 27hz i peak v bat =4.0v dc 3.0 3.4 a peak v bat =6.0v dc 4.0 5.2 v bat =8.0v dc 4.6 5.3 v bat =10.0v dc 5.1 5.4 ignition coil current peak, normal rpm i peak f=33hz 5.1 5.5 a peak f=133hz 5.1 5.5 f=200hz 4.2 5.4 f=267hz 3.4 4.4 f=333hz 2.7 3.4 ignition coil on-time, normal rpm range t on f=33hz 7.5 14.0 ms f=133hz 5.0 5.9 f=200hz 4.0 4.6 f=267hz 3.0 3.6 f=333hz 2.3 2.8 shutdown voltage v bat 25 30 35 v dc input threshold (static test) v thr turn-on 360 mv dc turn-off 90 input threshold hysteresis v hys 75 mv dc input threshold (act ive operation) v thr turn-on 1.8 v dc turn-off 1.5 total circuit lag from ts (figure 1) until ignition coil current falls to 10% 60 120 ? s ignition coil current fall time (90% ~ 10%) 4.0 ? s saturation voltage ic output (pin 7) (r drive = 100 ? ) v ce(sat) v bat =10v dc 120 mv dc v bat =30v dc 280 v bat =50v dc 540 current limit reference, pin 8 v ref 120 160 190 mv dc
93334 linear integrated circuit unisonic technologies co., ltd 4 of 4 www.unisonic.com.tw qw-r121-006.c ? i gnition coil current vs. frequency / period 6.0 5.5 5.0 4.0 3.0 2.0 1.0 333 i out (a) 5 200 133 10 100 70 15 20 50 25 33 30 ms frequency, f (hz) v bat =13.2v dc 8.0mh v bat -1.5v slope= utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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