93334_15 Datasheet, PDF (2/4 Pages) Unisonic Technologies – HIGH ENERGY IGNITION CIRCUIT

93334
 PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
 BLOCK DIAGRAM AND TYPICAL APPLICATION
Component Values
Pickup
Coil
R_L
R₁, R₂
C₁, C₂
R_BAT
CFilter
C_DWELL
R_GAIN
R_D2
R_S
R_DRIVE
R_D1
Series resistance = 800Ω±10% @ 25℃, inductance= 1.35H @ 1.0kHz @ 15Vrms
Leakage L=0.6mH, primary R=0.43Ω±5% @ 25℃, primary L=7.5mH ~ 8.5mH @ 5.0A
Load resistor for pickup=12KΩ±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 V_BAT =4.0V) =300Ω±20%
Transient filter on V_CC, non-critical
Stores reference, circuit designed for 0.1μF±20%
R_GAIN/R_D1 sets the DC gain of the current regulator =5.0k±20%
R_D2/R_D1 set up voltage feedback from R_S
Sense resistor (P_DA_G in thick film techniques) =0.075Ω±30%
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 = 100Ω±20%, 5.0W
Starting with 35Ω 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))-(≈100Ω)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R121-006.C