CS291N14 datasheet(3/4 Pages) CHERRY

No de pièce	CS291N14

Description	Ignition Controller

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Fabricant	CHERRY [Cherry Semiconductor Corporation]

Site Internet	http://www.cherrycorp.com/

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Package Pin Description

PACKAGE PIN #

PIN SYMBOL

FUNCTION

16 lead SO wide

14 lead PDIP

CS290

CS291

1

6

Gnd

Signal Ground.

2

3

MB

Master Bias. Sets up operating currents on the IC with exter-

nal resistor.

3

4

AC

Adaptive Capacitor. Follows the 25/75 capacitor. Voltage

trip points control the Output for setting dwell.

4

5

25/75

Run Capacitor. Provides 25%/75% charge and discharge

current to an external capacitor for setting dwell.

55

NC

VIN+

Input pin +.

67

7

VIN−

Input pin −.

7

8

Start

Input pin to put device in the “start mode”.

89

9

VCC

Supply input voltage.

9

10

D

Supply current to output pin.

10

11

CVS

Collector Voltage Sense. Input for flyback detect.

11

12

OUT

Output. Driver for external darlington.

12

1,13,16

1,2,16

NC

No connection.

13

14

CS

Current Sense. Feedback for max coil current.

14

15

BI

Battery Int. Input for “stall mode” of operation

NC

13

Test

Factory test pin. Pin should be grounded in customer

application.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Electrical Characteristics: 6V < VB < 16V, −30°C < TA < 125°C

s

Dwell: continued

Excess Dwell @ 200Hz

VBAT = 14V

14

20.8

%

(Run Mode)

Reduced Dwell Threshold

16.6

21.0

V

Reduced Dwell Hysteresis

200

800

mV

Reduced Dwell

VBAT = 20V

4.0

6.0

%

Typical Performance Characteristics

40

30

20

10

0

Time

Current

Limit

Spark Plug

Fires

Dwell Time

Normal Run Mode 17.5%

High Voltage Mode

5.0%

Start Mode

50.0%

Timing Diagram, ICOIL vs. Time

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