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UNISONIC TECHNOLOGIES CO., LTD
93334
LINEAR INTEGRATED CIRCUIT
HIGH ENERGY IGNITION
CIRCUIT
DESCRIPTION
This device is designed to use the 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 Protected Inputs and Outputs
SOP-8
*Pb-free plating product number: 93334L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
93334-S08-R
93334L-S08-R
93334-S08-T
93334L-S08-T
Package
SOP-8
SOP-8
Packing
Tape Reel
Tube
93334L-S08-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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QW-R121-006,A

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93334
PIN CONFIGURATION
POWER GND 1
LINEAR INTEGRATED CIRCUIT
8 IL
SENS GND 2
C3
UTC 93334
7 OUT
6 VCC
S1 4
5 S2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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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
R
12k
R2
20k
S2
5
S1
4
CFilter
0.2
Input
+ Comparator
- with
Hysteresis
RBAT
300
RDRIVE
100
Power
Output
&OVP
RGAIN
5.0k
CDWELL
0.1
C
3
+ Dwell
- Reference
Buffer
UTC 93334
Current
Limit
Sense
RD2
100
21
* 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 = 800±10% @ 25 , inductance= 1.35H @ 1.0kHz @ 15Vrms
Leakage L=0.6mH, primary R=0.43±5% @ 25 , primary L=7.5mH ~ 8.5mH @ 5.0A
Load resistor for pickup=10±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) =300±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) =0.075±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 = 100±20%, 5.0W
Starting with 35assures less than 5.5A, increasing as required to set 5.5A
RD1=(IO(PEAK) RS – VREF)/((VREF/RD2)-(1.4/RGAIN))- 100)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R121-006,A