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UC3842BDG Datasheet(PDF) 15 Page - ON Semiconductor

Part No. UC3842BDG
Description  High Performance Current Mode Controllers
Download  22 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3842BDG Datasheet(HTML) 15 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B
http://onsemi.com
15
+
-
+
-
5.0V Ref
36V
S
R
Q
Bias
+
1.0mA
Osc
R
R
R
2R
EA
1.0V
7(12)
7(11)
6(10)
5(8)
3(5)
RS
VCC
Vin
1(1)
2(3)
4(7)
8(14)
RT
CT
The buffered oscillator ramp can be resistively summed with either the voltage
feedback or current sense inputs to provide slope compensation.
m
- 3.0m
-m
Rf
Cf
Ri
Rd
From VO
RSlope
MPS3904
5(9)
Comp/Latch
Figure 33. Error Amplifier Compensation
+
R
2R
1.0mA
EA
2(3)
5(9)
2.5V
1(1)
Rf
Cf
Rd
Ri
From VO
Error Amp compensation circuit for stabilizing any current mode topology except for boost and flyback
converters operating with continuous inductor current.
Rf ≥ 8.8 k
+
R
2R
1.0mA
EA
2(3)
5(9)
2.5V
1(1)
Rf
Cf
Rd
Rp
From VO
Error Amp compensation circuit for stabilizing current mode boost and flyback
topologies operating with continuous inductor current.
Cp
Ri
Figure 34. Slope Compensation


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