FAN8038 データシートの表示（PDF） - Fairchild Semiconductor

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FAN8038

4-Channel Motor Drive IC

Fairchild Semiconductor 

FAN8038 (KA3038)

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 Diode and Capacitor .

BUCK

CON.

HVCC

AMP

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-----3----------R----2-----+-----R-----4--

-R-----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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