OBSOLETE

LM2575EP, LM2575HVEP

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SNVS301B – DECEMBER 2004 – REVISED APRIL 2013

TEST CIRCUIT AND LAYOUT GUIDELINES

As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring

inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the

length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as

indicated) or ground plane construction should be used for best results. When using the Adjustable version,

physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short.

D1 — Schottky, 11DQ06

L1 — 330

μH, PE-52627 (for 5V in, 3.3V out, use 100 μH, PE-92108)

Figure 24. Fixed Output Voltage Versions

R1 — 2k, 0.1%

R2 — 6.12k, 0.1%

Note: Pin numbers are for the TO-220 package.

Figure 25. Adjustable Output Voltage Version

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