TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
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FUNCTION TABLE
INPUT TO
OUTPUT CTRL
V
I
= GND
V
I
= V
ref
OUTPUT FUNCTION
Single-ended or parallel output
Normal push-pull operation
FUNCTIONAL BLOCK DIAGRAM
OUTPUT CTRL
(see Function Table)
RT 6
CT 5
≈
0.1 V
13
Oscillator
1D
4
Dead-Time Control
Comparator
C1
≈
0.7 V
Error Amplifier 1
1IN+
1IN−
1
2
+
−
Error Amplifier 2
2IN+
16
+
−
Reference
Regulator
14
REF
2IN− 15
Pulse-Steering
Flip-Flop
12
V
CC
Q2 11
10
Q1
8
9
C1
E1
DTC
PWM
Comparator
C2
E2
7
FEEDBACK
3
0.7 mA
GND
2