R1
Vref
R2
MC34060A MC33060A
Figure 15. Error Amplifier Sensing Techniques
VO To Output
Voltage of
System
1
+
3
–
2
Error
Amp
1
+
3
–
Error
2
Amp
Positive Output Voltage
VO = Vref (1 +
R1
R2
)
Negative Output Voltage
VO = –Vref (1 +
R1
R2
)
Vref
R2
R1
To Output
Voltage of
VO System
Figure 16. Deadtime Control Circuit
Figure 17. Soft–Start Circuit
Output
Vref
R1
Q
DT 4
RT
CT
6
5
R2
47k
0.001
Max % On Time ≈ 92 –
160
1 + R1
R2
Output
Q
Vref
4
DT
+
R1 – CS
R2
Figure 18. Slaving Two or More Control Circuits
Vref
6
RT
5
Master
CT
RT
CT
Vref
6
RT
Slave
5
CT
(Additional
Circuits)
8
MOTOROLA ANALOG IC DEVICE DATA