TL594 Datasheet, PDF (4/12 Pages) Texas Instruments – PULSE-WIDTH-MODULATION CONTROL CIRCUIT

TL594
6
R_T
5
C_T
4
Deadtime
Control
Oscillator
≈ 0.12V
≈ 0.7V
0.7mA
Deadtime
Comparator
−
+
−
+
PWM
Comparator
+
+
1
2
−
−
Output Control
13
DQ
Flip−
Flop
Ck Q
−
+ 4.9V
UV
Lockout _−
+
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
V_CC
8
Q1
9
Q2 ¹¹
10
12
V_CC
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
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4