Electrical Characteristics: 6V < V
B
< 16V,
−30°C
< T
A
< 125°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CS290/291
s
Dwell: continued
Excess Dwell @ 200Hz
(Run Mode)
Reduced Dwell Threshold
Reduced Dwell Hysteresis
Reduced Dwell
V
BAT
= 20V
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
V
BAT
= 14V
14
16.6
200
4.0
20.8
21.0
800
6.0
%
V
mV
%
14 lead PDIP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NC
16 lead SO wide
CS290 CS291
6
2
3
4
5
7
8
9
10
11
12
1,13,16
14
15
NC
6
3
4
5
NC
7
8
9
10
11
12
1,2,16
14
15
13
Gnd
MB
AC
25/75
V
IN+
V
IN−
Start
V
CC
D
CVS
OUT
NC
CS
BI
Test
Signal Ground.
Master Bias. Sets up operating currents on the IC with exter-
nal resistor.
Adaptive Capacitor. Follows the 25/75 capacitor. Voltage
trip points control the Output for setting dwell.
Run Capacitor. Provides 25%/75% charge and discharge
current to an external capacitor for setting dwell.
Input pin +.
Input pin
−.
Input pin to put device in the “start mode”.
Supply input voltage.
Supply current to output pin.
Collector Voltage Sense. Input for flyback detect.
Output. Driver for external darlington.
No connection.
Current Sense. Feedback for max coil current.
Battery Int. Input for “stall mode” of operation
Factory test pin. Pin should be grounded in customer
application.
Typical Performance Characteristics
Timing Diagram, I
COIL
vs. Time
40
Dwell Time
Normal Run Mode 17.5%
High Voltage Mode 5.0%
Start Mode
50.0%
Current
Limit
I
COIL
(mA)
30
20
10
0
Spark Plug
Fires
Time
Dwell Time
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
