TL494_10 Datasheet, PDF (9/14 Pages) Texas Instruments – PULSE-WIDTH-MODULATION CONTROL CIRCUITS

TL494, NCV494
R1
V_ref
R2
V_{O To Output}
Voltage of
System
1
+
Error
Amp
3
−
2
Positive Output Voltage
V_O = V_ref
1+
R₁
R₂
1
+
Error
Amp
−
2
Negative Output Voltage
V_O = V_ref
R₁
R₂
V_ref
R2
R1
V_O
To Output
Voltage of
System
Figure 14. Error−Amplifier Sensing Techniques
Output
Control
Output
Q
R_T
6
30k
V_ref
R₁
4
D_T
C_T
R₂
5
0.001
Output
Q
V_ref
C_S
4
D_T
R_S
Max. % on Time, each output ≈ 45 −
80
1
+
R1
R2
Figure 15. Deadtime Control Circuit
Figure 16. Soft−Start Circuit
Output
Control
0 ≤ V_OC ≤ 0.4 V
C¹
Q_{1 E1}
Single−Ended
C²
Q₂
E²
Q_C
1.0 mA to
500 mA
Q_E
2.4 V ≤ V_OC ≤ V_ref
Output
Control
C¹
Q_{1 E1}
Push−Pull
C²
Q_{2 E2}
1.0 mA to
250 mA
1.0 mA to
250 mA
Figure 17. Output Connections for Single−Ended and Push−Pull Configurations
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