LM3503SQX-44 National Semiconductor Corporation, LM3503SQX-44 Datasheet - Page 18

• Manufacturer Part Number: LM3503SQX-44
• Description: Dual-display Constant Current Led Driver With Analog Brightness Control
• Manufacturer: National Semiconductor Corporation

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Application Information
directly effects output voltage ripple and efficiency. The cur-
rent setting resistor, R1, should be kept close to the Fb pin to
minimize copper trace connections that can inject noise into
the system. The ground connection for the current setting
resistor network should connect directly to the Pgnd pin. The
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Agnd pin should be tied directly to the Pgnd pin. Trace
connections made to the inductor should be minimized to
reduce power dissipation and increase overall efficiency
while reducing EMI radiation. For more details regarding
layout guidelines for switching regulators, refer to Applica-
tions Note AN-1149.