FAN5343UMPX View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN5343UMPX

6-LED Series Boost LED Driver with Integrated Schottky Diode and Single-Wire Digital Interface

Fairchild Semiconductor 

Application Information

Inductor and Output Capacitor Selection

Table 1. Recommended External Components

# of LEDs L

Part Number

LQH43MN100K03

Manufacturer Min. COUT

Murata

5, 6

10.0µH NLCV32T-100K-PFR

TDK

1.00µF

VLF3010AT-100MR49-1

TDK

Part Number

UMK212BJ105KG

Manufacturer

Taiyo Yuden

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

FAN5343 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 FAN5343 evaluation board.

PCB Recommendations

ƒ The inductor can be connected to VIN with vias through

another layer if needed.

ƒ The feedback pin should be connected back to the IC

on a sub-layer.

© 2009 Fairchild Semiconductor Corporation

FAN5343 • Rev. 1.0.4

9

www.fairchildsemi.com

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