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| 93334 Datasheet, PDF (3/5 Pages) Unisonic Technologies – HIGH ENERGY IGNITION CIRCUIT | |||
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93334
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM AND TYPICAL APPLICATION
Figure 1
Reluctor
Pickup
1.35H
C1*
470
C2*
0.01
R1
20k
S2
R
5
12k
S1
R2
4
20k
CFilter
0.2
Input
+ Comparator
-
with
Hysteresis
RBAT
300
RDRIVE
100
Power
Output
&OVP
RGAIN
5.0k
+ Dwell
C
-
Reference Current
3
Buffer
Limit
CDWELL
Sense
0.1
RD2
UTC 93334
100
2
1
* Optional parts for extended transient protection
Power Ground
** A350V zener clamp is required when using the standard BU941
This clamp is not required if a selected version with VCEO(SUS) 550V is used
RD1
35-350
Ignition
Coil
Primary
8.0mH
**BU941
RS
0.075
Component Values
Pickup
Coil
RL
RA, RB
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=10â¦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
3 of 5
QW-R121-006,A
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