CP494
SWITCHMODE Pulse Width Modulation Control Circuit
V
CC
Output Control
13
8
9
6
5
D
Q
Q
Q1
Q2
Oscillator
Flip-
Flop
R
T
C
T
Deadtime
Comparator
11
10
Ck
-
+
0.12V
0.7V
4
Deadtime
Control
-
+
12
-
V
CC
+
4.9V
PWM
Comparator
0.7mA
UV
Lockout
Reference
Regulator
-
+
+
-
+
2
-
1
3.5V
1
2
3
15
16
14
7
Gnd
Error Amp
1
Feedback PWM
Comparator Input
Error Amp
2
Ref.
Output
This device contains 46 active transistors.
Figure 1. Representative Block Diagram
Capacitor C
T
Feedback/PWM Comp.
Deadtime Control
Flip-Flop
Clock Input
Flip-Flop
Q
Flip-Flop
Q
Output Q1
Emitter
Output Q2
Emitter
Output
Control
Figure 2. Timing Diagram
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Tel:886-3-3214525
Email: server@ceramate.com.tw
Http: www.ceramate.com.tw
Rev 1.0 Apr.19,2004
Page 4 of 11
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
