Data Sheet

©2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
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
16
15
12
1
2
9
8
10
5
7
3
6
4
14
11
13
U.V.L.O.
BAND GAP
REF 5V
LATCH
S
R
F/F
Q
Q
5K
VC
OUTPUT A
OUTPUT B
OSCILLATOR
DISCHARGE
5K
ERR
AMP
PWM
COMP
_
+
_
+
C
T
V
REF
V
CC
GND
EA(-)
EA(+)
EAOUT
C
(SOFT
START)
SHUT DOWN
SYNC
R
T
OSC
OUTPUT
KA3525A
SMPS Controller