UC3844B STMicroelectronics, UC3844B Datasheet - Page 10

• Manufacturer Part Number: UC3844B
• Description: Current Mode PWM
• Manufacturer: STMicroelectronics

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