FAN8040G3 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8040G3

4-Channel Motor Driver

Fairchild Semiconductor 

FAN8040

5. Channel 4 Driver (Spindle Motor Driver)

• The channel 4 driver is composed of input amplifer with input selection switch, V-I converter and output power amplifiers.

• The voltage, VREF, is the external reference voltage given by the bias voltage of the pin 26 in Figure. 4.

• The input signal, VIN, through the CH4IN (pin24) is amplified by 100K/100K times and then fed to the next amplifier. And

the amplified voltage is amplified by R2/R1 times and then the fed to the level shift circuit.

• Level shifit produces the current due to the difference between the input signal and the internal power reference (PVCC/2).

The current produced as + ∆I and - ∆I is fed into the driver buffer.

• If it is desired to change the gain, then the CH4CAPA (pin25) can be used. It is controlld by the SW (pin3) input signal.

• When the SW (pin3) is high level, then the input voltage,VIN, applied to the CH4CAPA (pin25).

Servo Output

R1

C1

VREF

100K

24

C2

25

10K

26

VREF

50K

3

100K

R2

R1

+ ∆I

Level

Shift

- ∆I

PVCC

50K VREF

50K

D

16

D

15

Figure 4. Channel 4 Spindle Driver

11

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