MIC4043 데이터 시트보기 (PDF) - Micrel

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MIC4043

Low-Voltage Secondary-Side Shunt Regulator

Micrel 

MIC4043

Off-Line 1.8V/2A Power Supply

85 to 264Vac

50/60Hz

Hot

F1

Ground

1A

Neutral

L1

20mH

C2

2200pF

400V

U2a

2501

C10

0.1µF

50/63V

U1

MIC38HC43BN

R5 1 COMP

1.21k 1%

VREF 8

2 FB

R6

VDD 7

1.21k

1%

3 ISNS

VOUT 6

4 RT/CT GND 5

R7

14k 1%

C6

470pF

63V

R1

C7 1k 1%

470pF

63V

U2b

2501

R10

72k

1%

BR1

DBR1

U3

MIC4043

C1

0.1µF

IN SNK

250V

C4

GND FB

47µF

R11

400V

33k

C3

2200pF

400V

1000pF

1%

249Ω

R2

332k

1%

R3

332k

1%

R4

34Ω

1%

D2 C5

18V 0.1µF

50/

63V

1

80T

2

D1

1N4448

4

C8

10T

22µF

25V

3

D4

12CTQ045

L2

7

5µH

3T

C11

1200µF

6

10V

T1

C12

220µF

10V

VTRIP

=

1.245V



R2

R1

+

1

R13

10Ω 1%

Q1

IRFIBE30G

R8

1.9Ω

1/4W

1%

C9

100pF

1kV

R9

470Ω

1/2W

D3

UF4005

VOUT

+1.8V/2A

R14

200Ω

1%

Return

Figure 3. Off-Line 1.8V/2A Power Supply

Micrel

Figure 3a. 1.8V/1A Bode Plot

(θ margin = 102°)

Figure 3b. 1.8V/2A Bode Plot

(θ margin = 87°)

November 2000

7

MIC4043

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