Diodes AP1506 - Manual (Page 2)

AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
AP1506
Document number: DS31015 Rev. 7 - 2
2 of 14
www.diodes.com
June 2010
© 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
AP1506
- 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
AP1506
Co
Capacitor
L 1
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
AP1506
Co
Capacitor
L1
47uH
5V/ 3A
Output Load
R2 R1
C
DELAY
0.1uF
10K
R
DELAY
Notes: 2. For up to 2A = DFLS230L (V
f
= 0.42V)
For up to 3A = B340LA, B340LB (V
f
= 0.45V)