FAN8042 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8042

5-CH Motor Driver

Fairchild Semiconductor 

Application Information

1. Thermal Shutdown

• When the chip temperature reaches to 160°C by abnormal condition,

then the TSD circuit is activated.

• This shut down the bias current of the output drivers, and all the

output drivers are in cut-off state. Thus the chip temperature begin to

decrease.

• when the chip temperature falls to 135°C, the TSD circuit is

deactivated and the output drivers are normally operated.

• The TSD circuit has the hysteresis temperature of 25°C.

SVCC

IREF

R1

Q0

R2

Hysteresis Ihys

R3

Output driver

bias

2. CH MUTE Function

• When the pin21,22 is high, the TR Q1 is turned on and Q2 is off, so

the bias circuit is enabled. On the other hand, when the pin21,22 is

Low (GND) , the TR Q1 is turned off and Q2 is on, so the bias circuit

is disabled.

• That is, this function will cause all the output drivers to be in mute

state.

• Truth table is as follows;

Pin 21,22

FAN8042

High

Mute-Off

Low

Mute-On

21 22

SVCC

Bias blocks

3-Ch BTL

Q2

Q1

3. Power Save Function

• When the pin38 is high, the TR Q3 is turned on and Q4 is off, so the

bias circuit is enabled. On the other hand, when the pin38 is Low

(GND) , the TR Q3 is turned off and Q4 is on, so the bias circuit is

disabled.

• That is, this function keeps all the circuit blocks of the chip off , thus

the low power quiescent state is established

38

• Truth table is as follows;

Pin38

FAN8042

High

Power Save Off

Low

Power Save On

SVCC

Main Bias

Q4

Q3

12

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