© 2009 Fairchild Semiconductor Corporation

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FAN5341 • Rev. 1.0.0

9

Application Information

Inductor & Output Capacitor Selection

# of LEDs

Inductor (L)

Part Number

Manufacturer

Part Number

Manufacturer

3, 4, 5

10.0µH

LQH43MN100K03

Murata

1.00µF

CV105X5R105K25AT

AVX/Kyocera

NLCV32T-100K-PFR

TDK

VLF3010AT-100MR49-1

TDK

4.7µH

LQH43MN4R7K03

Murata

1.00µF

CV105X5R105K25AT

AVX/Kyocera

NLCV32T-4R7M-PFR

TDK

LPF2010T-4R7M

ABCO

Table 1. Recommended External Components

Component Placement and PCB Recomendations

Figure 1. 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.

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.