UC2842ADR2G 查看數據表（PDF） - ON Semiconductor
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UC2842ADR2G Datasheet PDF : 18 Pages
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UC3842A, UC3843A, UC2842A, UC2843A
VCC
Vin
7(12)
MPS3904
RSlope
From VO
8(14)
RT
4(7)
CT
R
Bias
R
Osc
+
5.0Vref
+
+−
−
−m
+
−
+
−
7(11)
6(10)
Ri
1.0mA
2(3)
+
−
EA
2R
S
−
+
Q
R
5(8)
Rd
Cf
Rf
R
1.0V
Comp/Latch
m
1(1)
−3.0 m
5(9)
3(5)
RS
The buffered oscillator ramp can be resistively summed with either the voltage feedback or current sense inputs to provide slope compensation.
Figure 33. Slope Compensation
115Va
c
8(14)
0.01
10k
4(7)
4700pF
18k
2(3)
4.7k
1(1)
4.7W
Bias
Osc
+
+
−
EA
MDA
+
250
202
56k
5.0Vref
+
+−
7(12)
+
−+
4.7k
1N4935
+
68
100
1N4937
3300pF
1N4935
+
47
MBR1635 L1
T1
+
2200
1000
MUR110
+ L2
1000
10
1000
10
+
MUR110
680pF
L3
5.0V/4.0A
+
5.0V RTN
12V/0.3A
+
±12V RTN
+ −12V/0.3A
7(11)
22W
2.7k
1N4937
−
+
SQ
R
Comp/Latch
5(9)
6(10)
5(8)
3(5)
1.0k
470pF
MTP
4N50
0.5W
Figure 34. 27 Watt Off−Line Flyback Regulator
L1 − 15 mH at 5.0 A, Coilcraft Z7156.
L2, L3 − 25 mH at 1.0 A, Coilcraft Z7157.
T1 − Primary: 45 Turns # 26 AWG
T1 − Secondary ± 12 V: 9 Turns # 30 AWG
T1 − (2 strands) Bifiliar Wound
T1 − Secondary 5.0 V: 4 Turns (six strands)
T1 − #26 Hexfiliar Wound
T1 − Secondary Feedback: 10 Turns #30 AWG
T1 − (2 strands) Bifiliar Wound
T1 − Core: Ferroxcube EC35−3C8
T1 − Bobbin: Ferroxcube EC35PCB1
T1 − Gap ≈ 0.01" for a primary inductance of 1.0 mH
Test
Conditions
Line Regulation: 5.0 V
± 12 V
Vin = 95 Vac to 130 Vac
Load Regulation: 5.0 V
± 12 V
Output Ripple: 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
Vin = 115 Vac
Efficiency
Vin = 115 Vac
All outputs are at nominal load currents, unless otherwise noted.
Results
D = 50 mV or ± 0.5%
D = 24 mV or ± 0.1%
D = 300 mV or ± 3.0%
D = 60 mV or ± 0.25%
40 mVpp
80 mVpp
70%
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