UC3844BDG datasheet(13/19 Pages) ONSEMI

Part #	UC3844BDG

Description	High Performance Current Mode Controllers

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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13 / 19 page

UC3844B, UC3845B, UC2844B, UC2845B

http://onsemi.com

13

MUR110

+

-

+

-

S

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)

33k

1.0nF

470pF

150k

100

pF

18k

4.7k

Figure 30. 7 W Off−Line Flyback Regulator

0.01

100

+

1.0k

115 Vac

4.7

W

MDA

202

250

56k

4.7k

3300

pF

1N4935

+

68

47

1N4937

680pF 2.7k

L3

L2

L1

++

1000

2200

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

T

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 Vac 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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UC3844BDG Datasheet(PDF) 13 Page - ON Semiconductor

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