TL494, NCV494
V
O
V
ref
To Output
Voltage of
System
Error
Amp
+
−
2
R2
Positive Output Voltage
V
O
= V
ref
1+
R
1
R
2
Error
Amp
3
1
R2
R1
1
+
−
2
Negative Output Voltage
V
O
= V
ref
R
1
R
2
R1
V
O
To Output
Voltage of
System
V
ref
Figure 14. Error−Amplifier Sensing Techniques
Output
Control
Output
Q
R
T
6
5
C
T
V
ref
D
T
R
1
4
R
2
Output
Q
V
ref
D
T
4
R
S
C
S
30k
0.001
80
Max. % on Time, each output
≈
45 −
1 +
R1
R2
Figure 15. Deadtime Control Circuit
Figure 16. Soft−Start Circuit
C
1
Q
C
Q
1
Output
Control
Single−Ended
C
2
0
≤
V
OC
≤
0.4 V
Q
2
E
2
Q
2
Q
E
E
1
1.0 mA to
500 mA
Output
Control
Push−Pull
2.4 V
≤
V
OC
≤
V
ref
Q
1
C
1
E
1
1.0 mA to
250 mA
C
2
E
2
1.0 mA to
250 mA
Figure 17. Output Connections for Single−Ended and Push−Pull Configurations
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