Diodes AP1507 - Manual (Page 2)

AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
AP1507
Document number: DS31067 Rev. 3 - 2
2 of 12
www.diodes.com
May 2012
© Diodes Incorporated
Typical Application Circuit
(1) Fixed Type Circuit
1 2
3 5
4
12V
DC Input
C
in
Capacitor
FB
SD
D1
Schottky
Diode
V
in
GND
Output AP1507
-33
Co
Capacitor
Inductor
L1
33uH
3.3V/3A
Output Load
(2) Adjustable Type Circuit
1 2
3 5
4 12V
DC Input
C
in
Capacitor
FB
SD
D1
Schottky Diode
V
in
GND
Output
AP1507
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
C
in
Capacitor
FB
SD
D1
Schottky Diode
V
in
GND
Output
AP1507
Co
Capacitor
L1
47uH
5V/ 3A
Output Load
R2
R1
C
DELAY
0.1uF
10K
R
DELAY