FAN8422G View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN8422G

Floppy Disk Drive Spindle Motor Driver

Fairchild Semiconductor 

FAN8422G

Internal Block Diagram

VCC

17

CURRENT CURRENT

DETECTION2 DETECTION1

18

28

U INPUT(+) 20

U INPUT(−) 19

V INPUT(+) 26

V INPUT(−) 27

AGC 2

HALL BIAS 29

CE 7

FG INPUT(+) 30

FG INPUT(−) 1

FG OUTPUT 11

FG ZERO 10

CROSS

VOLTAGE REGULATOR 4

INDEX BURST 5

OSC INPUT 14

+

U_AMP

−

+

V_AMP

−

AGC

Output

control

Start-up

CE

1.3V

FG_AMP

+

−

Hall

zero-cross

FG

zero-cross

U_OUT

V_OUT

W_OUT

25 U PHASE

OUTPUT

24 V PHASE

OUTPUT

22 W PHASE

OUTPUT

TSD

CON_AMP

−

+

−

+

BUF_AMP

0.24V

16 PHASE

COMPENSATION

0.69V

Timing

detector

Burst time

circuit

2.2V

OSC

RPM select

Clock divider

Speed

control

Pulse width

adjustment

Charge

pump

6 INDEX

OUTPUT

3 INDEX PULSE

WIDTH

13 CHARGE

PUMP

OUTPUT

12

RPM

SELECT

9 8 23

SIGNAL

GROUND

15 21

NC

4

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