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Application Information
Inductor & Output Capacitor Selection
# of LEDs
Inductor (L)
Part Number
Manufacturer
Min C OUT
Part Number
Manufacturer
LQH43MN100K03
Murata
10.0μH
NLCV32T-100K-PFR
TDK
1.00μF
CV105X5R105K25AT
AVX/Kyocera
3, 4, 5
VLF3010AT-100MR49-1
LQH43MN4R7K03
TDK
Murata
4.7μH
NLCV32T-4R7M-PFR
TDK
1.00μF
CV105X5R105K25AT
AVX/Kyocera
LPF2010T-4R7M
ABCO
Table 1. Recommended External Components
Component Placement and PCB Recomendations
Figure 15. Recommended Component Placement
Input Capacitance
In a typical application, the input and output capacitors
should be placed as close to the IC as possible; no
additional capacitance is needed to ensure proper
functionality. However, in a testing environment, where the
FAN5341 is typically powered by a power supply with
relatively long cables, an additional input capacitor (10μF)
may be needed to ensure stable functioning. This capacitor
should be placed close to where the power supply cables
attach to the FAN5341 evaluation board.
? 2009 Fairchild Semiconductor Corporation
FAN5341 ? Rev. 1.0.1
9
PCB Recommendations
The inductor can be connected to VIN with vias through
another layer if needed.
The feedback pin should be connected back to the IC on
a sub-layer.
www.fairchildsemi.com
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