Diodes AP5725 - Manual (Page 12)

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