NC

NC

NC

COFF

FLTR2

NC

VCC

GATE

ISNS

GND

= VIA

GND

RECTIFIED AC INPUT

LED+

LED-

LM3444

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SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015

9 Power Supply Recommendations

Use any AC power supply capable of the maximum application requirements for voltage and total power.

10 Layout

10.1 Layout Guidelines

Keep the low power components for FILTER and COFF close to the LM3444 with short traces. The ISNS trace

should also be as short and direct as possible. Keep the high current switching paths generated by R3, Q2, L2,

and D10 as short as possible to minimize generated switching noise and improve EMI.

10.2 Layout Example

Figure 21. Layout Recommendation

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