Electrical Characteristics: 6V < VB < 16V, −30°C < TA < 125°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ꢀꢀ Dwell: continued
Excess Dwell @ 200Hz
(Run Mode)
VBAT = 14V
14
20.8
%
Reduced Dwell Threshold
Reduced Dwell Hysteresis
Reduced Dwell
16.6
200
4.0
21.0
800
6.0
V
mV
%
VBAT = 20V
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
16 lead SO wide
CS290 CS291
14 lead PDIP
1
2
6
2
6
3
Gnd
MB
Signal Ground.
Master Bias. Sets up operating currents on the IC with exter-
nal resistor.
3
4
3
4
4
5
AC
Adaptive Capacitor. Follows the 25/75 capacitor. Voltage
trip points control the Output for setting dwell.
25/75
Run Capacitor. Provides 25%/75% charge and discharge
current to an external capacitor for setting dwell.
5
6
5
7
NC
7
VIN+
VIN−
Start
VCC
D
Input pin +.
Input pin −.
7
8
8
Input pin to put device in the “start mode”.
Supply input voltage.
8
9
9
9
10
11
12
10
11
12
Supply current to output pin.
Collector Voltage Sense. Input for flyback detect.
Output. Driver for external darlington.
No connection.
10
11
12
13
14
NC
CVS
OUT
NC
CS
1,13,16 1,2,16
14
15
14
15
13
Current Sense. Feedback for max coil current.
Battery Int. Input for “stall mode” of operation
BI
NC
Test
Factory test pin. Pin should be grounded in customer
application.
Typical Performance Characteristics
Timing Diagram, ICOIL vs. Time
Dwell Time
Normal Run Mode 17.5%
High Voltage Mode 5.0%
Start Mode 50.0%
Current
Limit
40
30
20
10
0
Spark Plug
Fires
Dwell Time
Time
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
