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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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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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93334
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATING
UNIT
Power Supply Voltage-Steady State Transient 300ms or less
VCC
24
90
V
Output Sink Current-Steady State Transient 300ms of less
IOUT(SINK)
300
1.0
mA
A
Power Dissipation
Derate above 25°C
PD
1.05 W
12 mW/°C
Junction Temperature
Operating Temperature
TJ
TOPR
+125
-20~+85
°C
°C
Storage Temperature
TSTG
-40 ~ 150
°C
Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The device is guaranteed to meet performance specification within 0 ~+70 operating temperature range
and assured by design from -20 ~+85 .
ELECTRICAL CHARACTERISTICS (VCC = 13.2VDC, circuit of Figure 3, unless otherwise specified)
PARAMETER
SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Internal Supply Voltage, Pin 6
VBAT =4.0VDC
VCC
VBAT =8.0VDC
VBAT =12.0VDC
3.5
7.2
10.4
VDC
VBAT =14.0VDC
11.8
Ignition Coil Current Peak,
Cranking RPM 2.0Hz ~ 27Hz
IPEAK
VBAT =4.0VDC
VBAT =6.0VDC
VBAT =8.0VDC
VBAT =10.0VDC
F=33Hz
3.0 3.4
4.0 5.2
4.6 5.3
5.1 5.4
5.1 5.5
APEAK
F=133Hz
5.1 5.5
Ignition Coil Current Peak, Normal RPM
IPEAK F=200Hz
F=267Hz
4.2 5.4
3.4 4.4
APEAK
F=333Hz
2.7 3.4
F=33Hz
7.5 14.0
F=133Hz
5.0 5.9
Ignition Coil On-Time, Normal RPM Range
TON F=200Hz
F=267Hz
4.0 4.6 ms
3.0 3.6
F=333Hz
2.3 2.8
Shutdown Voltage
Input Threshold (Static Test)
VBAT
VTHR
Turn-on
Turn-off
25 30 35 VDC
360
90
mVDC
Input Threshold Hysteresis
Input Threshold (Active Operation)
VHYS
VTHR
Turn-on
Turn-off
75
1.8
1.5
mVDC
VDC
Total Circuit Lag from ts (Figure 1) until Ignition
Coil Current Falls to 10%
60 120 µs
Ignition Coil Current Fall Time (90% ~ 10%)
4.0 µs
Saturation Voltage IC Output (Pin 7)
(RDRIVE = 100)
Current Limit Reference, Pin 8
VCE(SAT)
VREF
VBAT =10VDC
VBAT =30VDC
VBAT =50VDC
120
280 mVDC
540
120 160 190 mVDC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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93334
LINEAR INTEGRATED CIRCUIT
LGNITION COIL CURRENT VERSUS FREQUENCY / PERIOD
6.0
5.5
5.0
Slope=
VBAT -1.5V
8.0mH
VBAT =13.2VDC
4.0
3.0
2.0
1.0
333 200 133 100
70
50
33
5 10 15 20 25 30 ms
Frequency, f (Hz)
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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