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93334_07 Datasheet, PDF (3/5 Pages) Unisonic Technologies – HIGH ENERGY IGNITION CIRCUIT | |||
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93334
LINEAR INTEGRATED CIRCUIT
 BLOCK DIAGRAM AND TYPICAL APPLICATION
Component Values
Pickup
Coil
RL
R1, R2
C1, C2
RBAT
CFilter
CDWELL
RGAIN
RD2
RS
RDRIVE
RD1
Series resistance = 800â¦Â±10% @ 25Â¥, inductance= 1.35H @ 1.0kHz @ 15Vrms
Leakage L=0.6mH, primary R=0.43â¦Â±5% @ 25Â¥, primary L=7.5mH ~ 8.5mH @ 5.0A
Load resistor for pickup=12Kâ¦Â±20%
Input buffer resistors provide additional transient protection to the already clamped
inputs=20k±20%
For reduction of high frequency noise and spark transients induced in pick-up and leads;
optional and non-critical
Provides load dump protection (but small enough to allow operation at VBAT =4.0V) =300â¦Â±20%
Transient filter on VCC, non-critical
Stores reference, circuit designed for 0.1µF±20%
RGAIN/RD1 sets the DC gain of the current regulator =5.0k±20%
RD2/RD1 set up voltage feedback from RS
Sense resistor (PDAG in thick film techniques) =0.075â¦Â±30%
Low enough to supply drive to the output Darlington, high enough to keep VCE(SAT) of the IC
below Darlington turn-on during load dump = 100â¦Â±20%, 5.0W
Starting with 35⦠assures less than 5.5A, increasing as required to set 5.5A
RD1=(IO(PEAK) RS â VREF)/((VREF/RD2)-(1.4/RGAIN))-(â100â¦)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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JUL 17.2007
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UTC Doc.Control Center
3 of 5
QW-R121-006.B
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