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KA3525A

SMPS Controller
Features
5V 1% Reference Oscillator Sync Terminal Internal Soft Start Deadtime Control Under Voltage Lockout

Description
The KA3525A is a monolithic integrated circuit that includes all of the control circuits necessary for a pulse width modulating regulator. There are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, an under voltage lockout, a soft start circuit, and the output driver in the chip.
16-DIP

1

Internal Block Diagram
VC VREF 16 VCC 15
GND

13
BAND GAP REF 5V U.V.L.O.

12 1 2 9
ERR AMP PWM COMP

EA(-) EA( ) EAOUT

11
OUTPUT A

LATCH S R

C (SOFT START)

8
Q Q

14
OUTPUT B

5K

CT

5 7

OSCILLATOR

F/F

10
SHUT DOWN 5K DISCHARGE

3
SYNC

6
RT

4
OSC OUTPUT

Rev. 1.0.1
2002 Fairchild Semiconductor Corporation

KA3525A Datasheet Fairchild Download PDF

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KA3525A DATASHEET