LM2575HVT-ADJ datasheet(12/43 Pages) TI1

12 / 43 page

LM1575, LM2575-N, LM2575HV

SNVS106E – MAY 1999 – REVISED APRIL 2013

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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.

CIN — 100 μF, 75V, Aluminum Electrolytic

COUT — 330 μF, 25V, Aluminum Electrolytic

D1 — Schottky, 11DQ06

L1 — 330

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

Figure 25. Fixed Output Voltage Versions

where

VREF = 1.23V, R1 between 1k and 5k.

R1 — 2k, 0.1%

R2 — 6.12k, 0.1%

Pin numbers are for the TO-220 package.

Figure 26. Adjustable Output Voltage Version

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Product Folder Links: LM1575 LM2575-N LM2575HV

LM2575HVT-ADJ Datasheet(PDF) 12 Page - Texas Instruments