AP1501

Document number: DS31014 Rev. 14 - 2

2 of 13

www.diodes.com

March 2021

© Diodes Incorporated

AP1501

1

2

3

5

4

12V

DC Input

Cin

Capacitor

FB

SD

D1

B340A

Vin

Gnd

Output

AP1501

-33

Co

Capacitor

Inductor

L1

33uH

3.3V/3A

Output Load

Typical Applications Circuit

(1) Fixed Type Circuit

Typical Applications Circuit (continued)

(2) Adjustable Type Circuit

1

2

3

5

4

12V

DC Input

Cin

Capacitor

FB

SD

D1

(Note 5)

Vin

Gnd

Output

AP1501

Co

Capacitor

L1

47uH

5V/ 3A

Output Load

R2

R1

Vout = VFB × (1 +

R2

R1

)

VFB = 1.23V

R2 = 1K ~ 3K

(3) Delay Start Circuit

1

2

3

5

4

12V

DC Input

Cin

Capacitor

FB

SD

D1

(Note 5)

Vin

Gnd

Output

AP1501

Co

Capacitor

L1

47uH

5V/ 3A

Output Load

R2

R1

CDELAY

0.1uF

10K

RDELAY

Note: Suggested Diodes Incorporated’s Power Schottky: B340A or PDS340 series.