SA6392

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:2.2

2004.02.12

Http: www.silan.com.cn

Page 4 of 9

(Continued)

* Pin 23 and pin 25 shorted internally.

FUNCTION DESCRIPTION

CIRCUIT OPERATION

(1) Fig. 2 shows the inputs from the digital servo IC for CH1-CH3 drivers (all drivers except the spindle).

SW1 is on when the forward input signal (HIGH level, over 2.4V) is present. SW2 is on when the reverse input

signal is present (Fig. 1)

The constant current (I1 ) at this time enters the RC and generates an integral waveform based on the duty of

the input waveform. The BTL is output from BUF1 and BUF2 (Fig. 3).

Fig.1

Pin no

Symbol

Description

10

IN2R

Driver channel 2 reverse input

11

IN2RC

Connect to attached resistor/capacitor (2)

12

OUT2R

Driver channel 2 reverse output

13

OUT2F

Driver channel 2 forward output

14

GND

Ground

15

MUTE

Driver mute control input

16

OUT3F

Driver channel 3 forward output

17

OUT3R

Driver channel 3 reverse output

18

IN3RC

Connect to attached resistor/capacitor (3)

19

IN3R

Driver channel 3 reverse input

20

IN3F

Driver channel 3 forward input

21

VCC

Power supply

22

VCC

Power supply

23

INB

Driver channel 4 bias input*

24

INS

Driver channel 4 input

25

INB

Driver channel 4 bias input*

26

OUT4R

Driver channel 4 reverse output

27

OUT4F

Driver channel 4 forward output

28

GND

Ground