ap1509-s Diodes, Inc., ap1509-s Datasheet - Page 6

• Manufacturer Part Number: ap1509-s
• Description: 150khz, 2a Pwm Buck Dc/dc Converter
• Manufacturer: Diodes, Inc.

Typical Application Circuit
(1) Fixed Type Circuit
(2) Adjustable Type Circuit
(3) Delay Start Circuit
AP1509 Rev. 2
DC Input
Capacitor
12V
C
in
DC Input
DC Input
Capacitor
Capacitor
12V
12V
Cin
Cin
V
in
R2 1K
R2 1K
C
0.1uF
R
DELAY
10K
DELAY
1
4
Vin
Vin
SD
V
V
R2 = 1K ~ 3K
1
1
4
out
FB
4
AP1509
SD
5
GND
SD
-33
= 1.23V
= V
AP1509
AP1509
3
5
5
Gnd
Gnd
6
GND
FB
FB
6
6
www.diodes.com
3
3
Gnd
Gnd
×
7
GND
FB
FB
(1 +
7
7
Gnd
Gnd
2
8
6 of 12
GND
2
2
8
8
R2
R1
Gnd
Gnd
150KHz, 2A PWM BUCK DC/DC CONVERTER
Output
Output
Output
)
R1 1K
R1 1K
Schottky Diode
Schottky
Schottky
Diode
Diode
D1
D1
D1
Inductor
Inductor
39uH
39uH
L1
L1
Inductor
47uH
L1
Capacitor
Capacitor
Output Load
Output Load
Co
Co
2.5V/2A
2.5V/2A
Capacitor
Co
©
FEBRUARY 2008
AP1509
Diodes Incorporated
Output Load
3.3V/2A