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UC3842BD1 Datasheet(PDF) 12 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) 12 Page - STMicroelectronics

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D95IN354
+
R
BIAS
OSC
C
R
+
-
+
-
EA
R
2R
R
S
Q
8
4
2
1
5
1mA
1V
+
-
5Vref
1M
Figure 24: Soft-Start Circuit
D95IN355
+
R
BIAS
OSC
C
R
+
-
+
-
EA
R
2R
R
S
Q
8
4
2
1
5
1mA
1V
5Vref
R2
R1
VClamp
+
-
Comp/Latch
7
RS
VCC
Q1
Vin
7
6
5
BC109
VCLAMP = ·
R1
R1 + R2
where 0 <VCLAMP <1V
Ipk(max) =
VCLAMP
RS
Figure 25: Soft-Start and Error Amplifier Output Duty Cycle Clamp.
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
12/15


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