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