TL494 Datasheet, PDF (8/12 Pages) Motorola, Inc – SWITCHMODE PULSE WIDTH MODULATION CONTROL CIRCUIT

R1
Vref
R2
TL494
Figure 14. Error–Amplifier Sensing Techniques
VO _{To Output}
Voltage of
System
1
+
Error
Amp
3
–
2
Positive Output Voltage
VO = Vref
1+
R1
R2
1
+
Error
Amp
–
2
Negative Output Voltage
VO = Vref
R1
R2
Vref
R2
R1
VO
To Output
Voltage of
System
Figure 15. Deadtime Control Circuit
Output
Control
Output
Q
RT
6
Vref
R1
4
DT
CT
R2
5
30k
0.001
Figure 16. Soft–Start Circuit
Output
Q
Vref
CS
4
DT
RS
Max. % on Time, each output ≈ 45 –
80
1
+
R1
R2
Figure 17. Output Connections for Single–Ended and Push–Pull Configurations
Output
Control
0 ≤ VOC ≤ 0.4 V
C1
Q1 _E1
Single–Ended
C2
Q2 _E2
QC
1.0 mA to
500 mA
QE
2.4 V ≤ VOC ≤ Vref
Output
Control
C1
Q1 _E1
1.0 mA to 250 mA
Push–Pull
C2
Q2 _E2
1.0 mA to 250 mA
8
MOTOROLA ANALOG IC DEVICE DATA