Diodes AP5002 - Manual (Page 5)

AP5002
PWM CONTROL 2A STEP-DOWN CONVERTER
AP5002 Rev. 8 5 of 10 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Typical Application Circuit
U1
AP5002
1
2
3
4 5
6
7
8
FB
EN
COMP
VCC Output
Output
VSS
VSS
C8
0.1uF
C3
0.1uF
C6
0.1uF
C7
0.1uF
C1
330pF
C4
22uF
D1
Dii 723
B340A
L1-(WURTH S05100104)
10uH
1 2
R4
0.8~2K
R1
3.8K
VIN+12V
R2
1.2K
R5
100K VOUT = 3.3V
C2
22uF
ON/OFF
Compensation Capacitor Selection(MLCC)
VIN VOUT R4 C7 C1
12V 5/ 3.3/ 2.5/ 1.8/ 1.5V 0.8~2K 0.1µF 330pF
5V 3.3/ 2.5/ 1.8/ 1.5V 0.8~2K 27nF 330pF
VOUT = 3.3V 10uH
1 2
R1
3.8K
ON/OFF
U1
AP5002
1
2
3
4 5
6
7
8
FB
EN
COMP
VCC Output
Output
VSS
VSS
R4
4.7~6.8K
C3
0.1uF
C8
0.1uF
C6
0.1uF
C7
33nF
C1
330pF
C4
470uF
D1
B340A
VIN+12V
R2
1.2K
R5
100K
C2
470uF
Dii 723
L1-(WURTH S05100104)
Notes: 4. V
OUT
= V
FB
)
R2
R1
(1
+ Ч