ASNS

FLTR1

DIM

COFF

FLTR2

BLDR

VCC

GATE

ISNS

GND

= VIA

GND

RECTIFIED AC INPUT

LED+

LED-

LM3445

www.ti.com

SNVS570M – JANUARY 2009 – REVISED NOVEMBER 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 ASNS, FLTR1, FLTR2, and COFF close to the LM3445 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 32. Layout Recommendation

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