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AP5725
WHITE LED STEP-UP CONVERTER
Applications Information (Continued)
VOUT
L1
22uH
VIN
C1
1uF
D2
LED
D1
B0540WS
1
U1
SW
Vin
6
C2
1uF
D3
2
GND
OVP
5
LED
R1
12ohm
3
FB
EN
4
ON
OFF
AP5725
D4
LED
D5
LED
D6
LED
D7
LED
Table 2. Suggested Inductors
Vendor
Wurth Electronics
GOTREND
TAIYO YUDRN
Inductors
(uH)
22
22
22
Current Rating
(A)
0.51A
0.56A
0.51A
Type
SMD
SMD
SMD
Dimensions
(mm)
3.8X 3.8 X 1.6
3.8 X 3.8 X 1.05
4.0 X 4.0 X 1.25
Series
744031220
GLP3810PH220N
NR4012
Table 3. Suggested Capacitors for C IN and C OUT
Vendor
TAIYO YUDEN
Capacitance
1uF
Type
SMD
Series
TMK212 B7105MG-T
Table 4. Suggested Diodes
Vendor
ZETEX
DIODES
DIODES
Rating
40V/0.5A
40V/0.5A
40V/0.25A
Type
SOD323
SOD323
SOD523
Series
ZLLS400
B0540WS
SDM20U40
Table 5. Suggested Resistor
Vendor
Type
Series
YAGEO SMD
Table 6. Suggested W-LED
FR-SK
Vendor
Type
Series
LITEON SMD
LTW-C1911UC5
AP5725
Document number: DS31844 Rev. 3 - 2
12 of 17
www.diodes.com
July 2010
? Diodes Incorporated
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