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UC3842BDG Datasheet(PDF) 16 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) 16 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B
http://onsemi.com
16
Figure 35. 27 W Off−Line Flyback Regulator
MUR110
+
-
+
-
S
R
+
R
R
5.0V Ref
Q
Bias
EA
5(9)
7(11)
6(10)
5(8)
3(5)
0.5
MTP
4N50
1(1)
2(3)
4(7)
8(14)
10k
4700pF
470pF
150k
100
pF
18k
4.7k
0.01
100
+
1.0k
115 Vac
4.7
W
MDA
202
250
56k
4.7k
3300
pF
1N4935
1N4935
++
68
47
1N4937
1N4937
680pF
2.7k
L3
L2
L1
++
++
++
1000
1000
2200
10
10
1000
5.0V/4.0A
5.0V RTN
12V/0.3A
±12V RTN
-12V/0.3A
Primary: 45 Turns #26 AWG
Secondary
±12 V: 9 Turns #30 AWG
(2 Strands) Bifiliar Wound
Secondary 5.0 V: 4 Turns (six strands)
#26 Hexfiliar Wound
Secondary Feedback: 10 Turns
#30 AWG (2 strands) Bifiliar Wound
Core: Ferroxcube EC35-3C8
Bobbin: Ferroxcube EC35PCB1
Gap:
≈ 0.10" for a primary inductance
of 1.0 mH
MUR110
MBR1635
T1
22
Osc
T1 -
7(12)
Comp/Latch
L1
L2, L3
- 15
mH at 5.0 A, Coilcraft Z7156
- 25
mH at 5.0 A, Coilcraft Z7157
1N5819
Test
Conditions
Results
Line Regulation: 5.0 V
±12 V
Vin = 95 to 130 Vac
D = 50 mV or ± 0.5%
D = 24 mV or ± 0.1%
Load Regulation: 5.0 V
±12 V
Vin = 115 Vac,
Iout = 1.0 A to 4.0 A
Vin = 115 Vac,
Iout = 100 mA to 300 mA
D = 300 mV or ± 3.0%
D = 60 mV or ± 0.25%
Output Ripple:
5.0 V
±12 V
Vin = 115 Vac
40 mVpp
80 mVpp
Efficiency
Vin = 115 Vac
70%
All outputs are at nominal load currents, unless otherwise noted


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