Diodes AP1501 - Manual (Page 8)

AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
AP1501 Rev. 11 8 of 12 JANUARY 2009
www.diodes.com © Diodes Incorporated
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 Application Circuit
(1) Fixed Type Circuit
(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
V
out
= V
FB
×
(1 +
R2
R1
)
V
FB
= 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
C
DELAY
0.1uF
10K
R
DELAY
Notes: 5. Suggested DIODES Power Schottky: B340A or PDS340 series.