UC3844 Ver la hoja de datos (PDF) - Motorola => Freescale
Número de pieza
componentes Descripción
Fabricante
UC3844 Datasheet PDF : 14 Pages
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UC3844, 45 UC2844, 45
Figure 29. 27 Watt Off–Line Flyback Regulator
4.7Ω
115Vac
MDA
+
250
202
56k
8(14)
0.01
33k
4(7)
1.0nF
18k
2(3)
4.7k
Bias
Osc
+
+
–
EA
5.0Vref
+
+–
7(12)
+
–+
T
S
–
+
Q
R
Comp/Latch
4.7k
1N4935
+
68
100
1N4937
3300pF
MBR1635 L1
T1
+
2200
1000
1N4935
+
47
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)
22Ω
6(10)
1N5819
5(8)
3(5)
1.0k
2.7k
MTP
4N50
1N4937
1(1)
5(9)
470pF
0.5Ω
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
L1 – 15 µH at 5.0 A, Coilcraft Z7156.
L2, L3 – 25 µH at 1.0 A, Coilcraft Z7157.
Test
Conditions
Results
Line Regulation: 5.0 V Vin = 95 Vac to 130 Vac
± 12 V
∆ = 50 mV or ± 0.5%
∆ = 24 mV or ± 0.1%
Load Regulation: 5.0 V Vin = 115 Vac, Iout = 1.0 A to 4.0 A
∆ = 300 mV or ± 3.0%
± 12 V Vin = 115 Vac, Iout = 100 mA to 300 mA ∆ = 60 mV or ± 0.25%
Output Ripple: 5.0 V Vin = 115 Vac
± 12 V
40 mVpp
80 mVpp
Efficiency
Vin = 115 Vac
70%
All outputs are at nominal load currents, unless otherwise noted.
12
MOTOROLA ANALOG IC DEVICE DATA
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