UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
Figure 20 :
Latched Shutdown.
4
OSC
8
R
BIAS
R
+
1mA
+
2
-
EA
2R
R
1
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 V
O
R
i
2
R
d
C
f
R
f
1
2.5V
+
1mA
+
-
EA
2R
R
5
Error Amp compensation circuit for stabilizing any current-mode topology except
for boost and flyback converters operating with continuous inductor current.
+
1mA
R
P
R
i
2
C
P
R
d
C
f
R
f
1
5
D95IN351
From V
O
2.5V
+
-
EA
2R
R
Error Amp compensation circuit for stabilizing current-mode boost and flyback
topologies operating with continuous inductor current.
10/15
STMICROELECTRONICS [ STMICROELECTRONICS ]
