ORDERING INFORMATION
22-DIP-400
Device
Package
Operating Temperature
° °
-25 C ~ 85 C
KA3511
22 DIP
FEATURES
• Complete PWM control and house keeping circuitry
• Few external components
• Precision voltage reference trimmed to 2%
• Dual output for push-pull operation
• Each output TR for 200mA sink current
• Variable duty cycle by dead time control
• Soft start capability by using dead time control
• Double pulse suppression logic
• Over voltage protection for 3.3V / 5V / 12V
• Under voltage protection for 3.3V / 5V / 12V
• One more external input for various protection (PT)
• Remote on/off control function (PS-ON)
• Latch function controlled by remote and protection input
• Power good signal generator with hysteresis
• 22-Pin dual in-line package
2. BLOCK DIAGRAM
22 C1
R
T
7
8
D
Q
Q
OSCILLATOR
C
T
PWM
CONTROL
C2
E
20
CK
COMP
2
21
5
V5
V12
DELAY
CONTROLLER
DEAD TIME
CONTROLLER
R
S
REMOTE ON/OFF
1.4V
T
REM
E/A(-)
E/A(+)
3
4
Q
6
REM
(PS-ON)
1.25V
0.1V
DEAD TIME
CONTROL
11
PG
19
5V
16
15
14
PT
INTERNAL
BIAS
V12
12
1
VREF
V5
VREF
VREF
VREF
OVP
13 V3.3
Start Up
PG
COMP
V
CC
GENERATOR
Ichag
COMP1
COMP2
1.25V
5V
COMP3
DET
9
1.8V 0.6V
0.6V
1.8V
1.25V
UVP
COMP
1.25V
10
17
18
T
T
GND
PG
UVP
2.2uF
2.2uF
Rev C, November 1999
2
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
