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KA3525A
SMPS Controller
Features
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Description
5V ±1% Reference
Oscillator Sync Terminal
Internal Soft Start
Deadtime Control
Under Voltage Lockout
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
13
VREF 16
BAND GAP
REF 5V
VCC 15
GND
12
EA(-)
1
U.V.L.O.
EA(+)
OUTPUT A
ERR
AMP
+
2
EAOUT
11
_
9
C
(SOFT
START)
_
LATCH
PWM
COMP
+
S
R
8
14
OUTPUT B
CT
5K
5
OSCILLATOR
F/F
10
SHUT DOWN
5K
Q
Q
7
DISCHARGE
3
SYNC
6
RT
4
OSC
OUTPUT
Rev. 1.0.1
©2002 Fairchild Semiconductor Corporation