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Application Information
Inductor and Output Capacitor Selection
Table 1.
Recommended External Components
# of LEDs
L
Part Number
Manufacturer Min. C OUT
Part Number
Manufacturer
LQH43MN100K03
Murata
5, 6
10.0μH
NLCV32T-100K-PFR
TDK
1.00μF
UMK212BJ105KG
Taiyo Yuden
VLF3010AT-100MR49-1
TDK
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.
? 2009 Fairchild Semiconductor Corporation
FAN5343 ? Rev. 1.0.4
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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