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FAN8038C

4-Channel Motor Drive IC

Fairchild Semiconductor 

FAN8038C

Application Information

1. BAKE AND MUTE FUNCTION

• Of the four channel drivers, channel 1 has a brake function, and the other channels have a mute function.

• When the BRAKE (pin23) is set to high level, both channel 1 outputs go low level. (Brake mode).

• When the MUTE2 (pin21) is set to high level, the channel 2 output is muted.

• When the MUTE34 (pin19) is set to high level, the channel 3 and 4 outputs are muted.

•

2. REFERENCE VOLTAGE(VREF) DROP MUTE

• When the voltage applied to VREF (pin16) is 1.0V or less (typical), the H-bridge driver outputs are set to high impedance.

3. THERMAL SHUTDOWN (TSD)

• If the chip temperature reaches 150°C (typical), the H-bridge driver output current is cut-off and the thermal shut down

circuit has a hysteresis temperature of 25°C.

4. H-BRIDGE DRIVER (4-CHANNELS)

• The driver input resistance is 11KΩ(typical) for channels 1, 3 , and 4, and 7.5KΩ for channel 2. Set the gain according to

the following formula.

•

Channel

Gain

Unit

CH1

CH3

Gv = 20log 55K

dB

CH4

11K + REXT

CH2

Gv = 20log 110K

dB

7.5K + REXT

where, REXT is externally connected input resistance.

5. SWITCHING REGULATED POWER SUPPLY DRIVE

• The power supply of H-bridge driver consists of DVCC(pin36) for output stage power supply and VSYS2 (pin15) for

predriver power supply.

VBAT

37

15

36

PWM

44

Maximum

Pre-

driver

Detector

9

Triangular

Waveform

25 27 29 31

24 26 30 32

28

Figure 1. Switching Regulated Power Supply

10

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