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UC3842BD1 Datasheet(PDF) 10 Page - STMicroelectronics

Part No. UC3842BD1
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3842BD1 Datasheet(HTML) 10 Page - STMicroelectronics

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


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