UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
Figure 20 :
LatchedShutdown.
4
8
OSC
BIAS
R
R
+
1mA
2R
+
-
2
1
EA
R
5
2N
3905
2N
3903
D95IN350
SCR must be selected for a holding current of less than 0.5mA at T
.
A(min)
The simple two transistor circuit can be used in place of the SCR as shown. All resistors are 10K.
Figure 21:
Error Amplifier Compensation
+
From VO
Ri
2.5V
1mA
2R
+
-
2
1
EA
R
Rd Cf
Rf
5
Error Amp compensation circuit for stabilizing any current-mode topology except
for boost and flyback converters operating with continuous inductor current.
+
From VO
RP
2.5V
1mA
2R
+
-
Ri
2
1
EA
R
CP
Rd
Cf
Rf
5
D95IN351
Error Amp compensation circuit for stabilizing current-mode boost and flyback
topologies operating with continuous inductor current.
10/15
STMICROELECTRONICS [ ST ]
