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TL494_10 Datasheet, PDF (5/14 Pages) Texas Instruments – PULSE-WIDTH-MODULATION CONTROL CIRCUITS | |||
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TL494, NCV494
6
RT
5
CT
4
Deadtime
Control
Oscillator
0.12V
0.7V
0.7mA
Deadtime
Comparator
â
+
â
+
PWM
Comparator
+
+
1
2
â
â
Output Control
13
D
Q
Flipâ
Flop
Ck Q
â
+ 4.9V
UV
Lockout â
+
3.5V
Reference
Regulator
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
VCC
8
Q1
9
Q2 11
10
12
VCC
Capacitor CT
Feedback/PWM Comp.
Deadtime Control
FlipâFlop
Clock Input
FlipâFlop
Q
FlipâFlop
Q
Output Q1
Emitter
Output Q2
Emitter
Output
Control
Figure 2. Timing Diagram
http://onsemi.com
5
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