CP494 Datasheet, PDF (4/11 Pages) Ceramate Technical – SWITCHMODE Pulse Width Modulation Control Circuit

CP494
SWITCHMODE Pulse Width Modulation Control Circuit
Output Control
V_CC
13
6
R_T
5
C_T
4
Deadtime
Control
Oscillator
0.12V
0.7V
0.7mA
+
1
-
Deadtime
Comparator
-
+
-
+
PWM
Comparator
+
2
-
D
Q
Flip-
Flop
Ck Q
-
+ 4.9V
UV
Lockout _-
+
3.5V
Reference
Regulator
8
Q1 ₉
Q2 ¹¹
10
12
V_CC
12
Error Amp
1
3
Feedback PWM
Comparator Input
15 16
Error Amp
2
14
7
Gnd
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
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Rev 1.0 Apr.19,2004