FAN8038 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8038

4-Channel Motor Drive IC

Fairchild Semiconductor 

Application Information

1. MUTE FUNCTION

• When The BRAKE Pin is low is normal opration (high is CH1 mute on).

• When The Mute2 Pin is low is normal opration (high is CH2 mute on).

• When The Mute34 Pin is high is normal opration (low is CH3,4 mute on).

FAN8038 (KA3038)

2. VREF DROP MUTE (FIGURE 1)

• When the Voltage of the mute pin is above 1V, the mute circuit is stopped and the output circuit is.

VCC

VCC

VREF

CH Bias Block

Hysteresis

2

CH Bias Block

Q1 1

Figure 1. VREF Drop MUTE Circuit

Figure 2. TSD Circuit

3. THERMAL SHUTDOWN(FIGURE 2)

• If the chip temperature rises above 150°C, then the thermal shutdown (TSD) circuit is activated and the output circuit will

be mute.

4. H-BRIDGE DRIVER (4-CHANNELS)

Driver input resistance is 10KΩ of CH1, CH3, CH4 and input resistance of CH2 is 7.5KΩ.

Driver gain can obtain under -mentioned

CH1, 3, 4:

CH2

GV = 20log ------5---5----K--------

11K + R

GV = 20log -----1---1----0---K-------

7.5K + R

R is External resistance.

10

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