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| AP1538 Datasheet, PDF (5/14 Pages) Diodes Incorporated – 18V 3A 300KHz BUCK CONVERTER | |||
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Typical Application Circuit
AP1538
18V 3A 300KHz BUCK CONVERTER
VIN
Vcc
Output
ROCSET COCSET
3K Option
AP 1538
C IN
OCSET
FB
470uF
EN
V SS
CVcc
REN
100K
0.1uF
CEN
0.1uF
L1
22uH
Cc
Option
(Note 8)
D1
(Note 6)
VOUT = 5V/3A
RA
6.8K
+
-
RB
1.3K
+
C
0.1uF-
COUT
470uF
(Note 7)
VOUT =V FB x (1+ RA/RB)
R B= 0.7K~5 K ohm
Notes:
6. Suggested DIODES Power Schottky P/N: B340 series or PDS340.
7. Suggested COUT for VOUT < 1V; 680μF.
8. Typical feedback compensation (Cc): 5600pF.
AP1538 Rev. 2
5 of 14
www.diodes.com
JUNE 2008
© Diodes Incorporated
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