TL494 Datasheet, PDF (4/12 Pages) Motorola, Inc – SWITCHMODE PULSE WIDTH MODULATION CONTROL CIRCUIT

TL494
Figure 1. Representative Block Diagram
6
RT
5
CT
4
Deadtime
Control
Oscillator
0.12V
0.7V
0.7mA
+
1
–
Deadtime
Comparator
–
+
–
+
PWM
Comparator
+
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.
Capacitor CT
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
VCC
8
Q1
9
Q2 ¹¹
10
12
VCC
4
MOTOROLA ANALOG IC DEVICE DATA