FAN8729 Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN8729

Spindle+4-CH Motor Drive IC

Fairchild Semiconductor 

FAN8729

Application Information

1. MUTE Function

• MUTE circuit turns BTL output ON/OFF.

• When MUTE terminal (pin42, pin43) is OPEN, or terminal voltage is

42

lower than 1V, BTL is disable.

43

• When MUTE terminal (pin42, pin43) is voltage is higher than 1.5V,

BTL output operates normally.

• Feature Table.

MUTE circuit voltage MUTE status

Above 1.5V

OFF

Below 1V or Open

ON

2. TSD Function

• TSD circuit intercepts all IC output to protect the IC against high

temperatures.

• When chip temperature rises above 165°C, BTL and spindle output is

disable.

• When chip temperature falls below 140°C, BTL and spindle output

operates normally.

• TSD has hysteresis of 25°C.

SVCC

IREF

R1

Q0

R2

Hysteresis

Ihys

R3

Output driver

Bias

3. TSD Monitor Function

• TSD monitor circuit displays TSD status.

• When TSD is ON, pin18 is HIGH.

• When TSD is OFF, pin18 is LOW.

• Since output pin(PIN18) is open-collector, pull-up resistance should be

attached outside.

• Feature Table.

TSD

Pin18

TSD On

High

TSD Off

Low

VCC

R(external)

TSD

18

Q6

SVCC

20k

Q5

11

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