UNISONIC TECHNOLOGIES CO., LTD
UL497
Preliminary
LINEAR INTEGRATED CIRCUIT
HALL EFFECT PICKUP
IGNITION CONTROLLER
DESCRIPTION
As an integrated electronic ignition controller for breakerless
ignition systems which uses Hall effect sensors, the UTC
UL497
drives an NPN external darlington to control the coil current
providing the required stored energy with low dissipation.
One of the UTC
UL497
special features is the programmable
time for the recovery of the correct dwell ratio Td/T while the coil
peak current fails to reach 94 % of the nominal value.
FEATURES
* Direct driving of the external power darlington
* Coil current charent charging angle control
* Programme coil current peak limitation
* When 94% nominal current not reached programmable dwell
recovery time
* RPM output
* Has peranent conduction protection
* Overvoltage protection
* Internal supply zener
* Reverse battery protection
ORDERING INFORMATION
Ordering Number
Lead Free
UL497L-S16-R
UL497L-S16-T
Halogen Free
UL497G-S16-R
UL497G-S16-T
Package
SOP-16
SOP-16
Packing
Tape Reel
Tube
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UL497
PIN CONFIGURATION
Preliminary
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION
(refer to APPLICATION CIRCUIT)
PIN NO.
1
2
3
4
5
PIN NAME
GND
SIGNAL GND
POWER SUPPLY
N.C.
HALL-EFFECT INPUT
DESCRIPTION
This pin must be connected to ground.
This pin must be connected to ground.
The input of supply voltage. Its voltage will be limited by an 7.5V zener. The
R5 inside will limit the current by the zener for high supply voltege.
Connected to ground or left open.
The input of the hall-effect pickup signal. This input is dwell control circuit
output to enable the current driving into the coil.
As a open collector output, it’s at low level when current flows in the ignition
coil. It should be connected pin7 zener for high volteges protection. Then R
8
must limit the zener current, too, and R
1
limits pin 6 current if RPM module
pad is accidentally connected to V
S.
A 21V Zener whose current must be limited by an internal resistor.
A capacitor connected between this pin and ground sets the slope of the
dwell time variation as it rises from zero to the correct value. It occurs just
following the detection of I
coll
≤94%
I
nom
, only before the low transition of the
hall-effect signal pulse. The duration is given :
t
src
=12.9×R
7src×
C
src
(ms)
PS: R
7
(KΩ) is the biasing resistor at pin 12 and C
src
(μF) is the delay
capacitor at pin 8.
Between this pin and ground there’s a capacitor which determines the
intervention delay of the permanent conduction protection. The coil current is
slowly reduced to zero after the delay time.
Delay Time T
P
is given by :
t
P
=16×R
7
C
P
(ms)
PS: R
7
(KΩ) is the biasing resistor at pin 12 and C
P
(μF) is the delay capacitor
at pin 9.
Connected between this pin and ground there’s a capacitor C
T
which is
charged when the Hall effect output is High and is discharged at the High to
Low transition of the Hall effect signal. When using a 62KΩ resistor at pin12
C
T
should be 100nF.
6
7
RPM OUTPUT
AUX. ZENER
8
RECOVERY TIME
9
MAX CONDUCTION
TIME
10
DWELL CONTROL
TIMER
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UL497
PIN DESCRIPTION (Cont.)
PIN NO.
11
PIN NAME
DWELL CONTROL
Preliminary
LINEAR INTEGRATED CIRCUIT
12
BIAS CURRENT
13
CURRENT SENSING
DRIVER EMITTER
OUTPUT
OVER VOLTAGE LIMIT
DRIVER COLLECTOR
INPUT
DESCRIPTION
The average voltage on the capacitor CW connected between this pin and
ground depends on the motor speed and the voltage supply. The comparison
between V
CW
and V
CT
voltage determines the timing for the dwell control.
The internal current which used to drive the external capacitors of the dwell
control(pin10 and11)permanent conduction protection (pin 9) and slow
recovery time (pin 8) can be set by a resistor(recommended 62KΩ)
connected between this pin and ground.
Connection for the Coil Current Limitation.
The current limitation value is given by :
I
sens
=0.32×(R10+R11)÷(R
S
×R11)
RS: sensing resistor
Current Driver for the External Darlington.
The internal divider R
3
/R
2
defines the limitation value given by:
V
OVP
=(22.5/R3+5×10
-3
)×R
2
+22.5
Through this pin The collector current of the internal driver which drives the
external limits darlington is supplied. Then the external resistor R
6
the
maximum current supplied to the base of the external darlington.
14
15
16
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UL497
BLOCK DIAGRAM
Preliminary
LINEAR INTEGRATED CIRCUIT
POWER SUPPLY
3
RPM OUTPUT
6
DRIVER
COLLECTION INPUT
16
RPM
BIAS CURRENT
12
REFERENCE
OVER
VOLTAGE
PROTECTION
15
OVER
VOLTAGE
LIMIT
HALL EFFECT INPUT
DWELL
CONTROL
5
10
DWELL
CONTROL
CONTROL
SWITCH
DRIVING
STAGE
14
DRIVER
EMITTER
OUTPUT
DWELL
CONTROL
11
DESATURATION SENSOR
CURRENT LIMITER
13
CURRENT
SENSING
RECOVER TIME
8
SLOW RECOVERY CIRCUIT
PERMANENT CONDUCTION PROTECTION
AUX
ZENER
7
4
N.C.
9
MAX TIME
1
GND
2
SINGLE GND
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PARAMETER
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
RATINGS
UNIT
D.C. Supply Current
200
mA
I
3
Transient Supply Current t
f
fall time constant=100ms
800
mA
Supply Voltage
V
3
Internal Limited to Vz
3
RPM Voltage
V
6
28
V
D.C. Driver Collector Current
300
mA
I
16
Pulse
(t
≤
3ms)
600
mA
Driver Collector Voltage
V
16
28
V
Auxiliary Zener Current
I
7
40
mA
Pulse t
fall
=300μs
15
mA
D.C. Overvoltage Zener
I
15
Current
t
rep
Repetition Time≥3ms
35
mA
Reverse Battery Voltage if Application Circuit
V
R
-16
V
Power Dissipation
T
C
=90°C
P
D
1.2
W
Junction Temperature
T
J
-55~150
°C
Storage Temperature
T
STG
-55~150
°C
Note: 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.
SYMBOL
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
Junction to Ambient (Note)
θ
JA
50 (MAX)
°C/W
Note: Thermal resistance junction Ambient with the device soldered on the middle of an Ambient supporting
substrate measuring 15x20; 0.65mm thickness.
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