FAN8038B 데이터 시트보기 (PDF) - Fairchild Semiconductor

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FAN8038B

4-Channel Motor Drive IC

Fairchild Semiconductor 

5. Switching Regulated Power Supply Drive

• This circuit detects a maximum output value of 4CH drivers and then generates PWM Signal.

• External Component is PNP-Tr, Coil, Schottky Diodeand Capacitor .

FAN8038B(KA3038)

BUCK

CON.

AMP

HVCC

HVCC

OSC

OUTPUT

LEVEL DET.

Figure 1. Switching Regulated Power Supply

6. DC/DC Converter Control Circuit

• Booster circuit needs External component. and the voltage() is defined as follows.

-R-----1-----⋅---R-----3-- + -R-----2-----⋅---R-----4--

SVCC1 = 1.267 × -R----1-----+-----R--R--------3--2----------⋅------R--R-------4--2------+-----R-----4--

R2 + R4

R1 = Resistor1

R2 = Resistor2

R3 = 30KΩ

R4 = 30.5KΩ

12

R1

7

R2

30k

30.5k

Figure 2. Output Voltage

11

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