UC3845BD1 Просмотр технического описания (PDF) - Motorola => Freescale

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производитель

UC3845BD1

High Performance Current Mode Controllers

Motorola => Freescale 

UC3844B, 45B UC2844B, 45B

Figure 29. 7 W Off–Line Flyback Regulator

4.7Ω

MDA

202

115 Vac

0.01

8(14)

33k

1.0nF 4(7)

18k

100

4.7k pF

2(3)

150k

1(1)

R

Bias

R

Osc

+

EA

+ 250

56k

7(12)

5.0V Ref

+

–

+

–

T

S

Q

R

Comp/Latch

5(9)

4.7k

T1

3300

pF

1N4935 1N4935

+ 68

100

+

47

MBR1635

L1

5.0V/4.0A

+

+

2200

1000

5.0V RTN

MUR110

12V/0.3A

+ L2 +

1000

10

±12V RTN

1N4937

7(11)

22

6(10)

1N5819

1000 + 10 +

–12V/0.3A

MUR110

L3

680pF 2.7k

1N4937

MTP

4N50

5(8)

1.0k

3(5)

0.5

470pF

T1 – 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

L1 – 15 µH at 5.0 A, Coilcraft Z7156

L2, L3 – 25 µH at 5.0 A, Coilcraft Z7157

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

∆ = 50 mV or ±0.5%

∆ = 24 mV or ±0.1%

∆ = 300 mV or ±3.0%

∆ = 60 mV or ±0.25%

40 mVpp

80 mVpp

70%

MOTOROLA ANALOG IC DEVICE DATA

13

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