Copyright

© ANPEC Electronics Corp.

Rev. A.7 - Mar., 2011

APW7145

www.anpec.com.tw

11

Typical Application Circuit

1. 4.3~14V Single Power Input Step-down Converter (with a Ceramic Output Capacitor)

LX

EN

6

VIN

2

AGND

3

COMP

5

9

U1

APW7145

FB

4

V

OUT

L1

3A

V

IN

C1

LX

7

Enable

Shutdown

PGND

8

C2

R1

±

1%

R2

±1%

C4

(±

30%, Optional)

R3

(±

5%)

C3

(±

30%)

a. Cost-effective Feedback Compensation (C4 is no connection)

V

V

L1(

µF)

C2(

µF)

C2 ESR(m

Ω)

R1(k

Ω)

R2(k

Ω)

R3(k

Ω)

C3(pF)

12

5

6.8

22

5

63.0

12

33.0

820

12

5

6.8

44

3

63.0

12

68.0

820

12

3.3

4.7

22

5

46.9

15

27.0

1000

12

3.3

4.7

44

3

46.9

15

56.0

1000

12

2

3.3

22

5

30.0

20

18.0

1800

12

2

3.3

44

3

30.0

20

33.0

1800

12

1.8

3.3

22

5

18.8

15

15.0

1800

12

1.8

3.3

44

3

18.8

15

30.0

1800

5

3.3

2.2

22

5

46.9

15

27.0

470

5

3.3

2.2

44

3

46.9

15

56.0

470

5

1.8

2.2

22

5

25.0

20

15.0

820

5

1.8

2.2

44

3

25.0

20

30.0

820

5

1.5

2.2

22

5

21.9

25

12.0

1000

5

1.5

2.2

44

3

21.9

25

24.0

1000

5

1.2

2.2

22

5

7.5

15

10.0

1200

5

1.2

2.2

44

3

7.5

15

20.0

1200