LM2575HV datasheet(11/27 Pages) NSC

Numer części	LM2575HV

Szczegółowy opis	SIMPLE SWITCHER 1A Step-Down Voltage Regulator

PDF	27 Pages

Scroll/Zoom	100%

Producent	NSC [National Semiconductor (TI)]

Strona internetowa	http://www.national.com

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11 / 27 page

Typical Performance Characteristics (Circuit of Figure 2) (Continued)

Feedback Pin Current

Maximum Power Dissipation

(TO-263) (See (Note 12))

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Switching Waveforms

Load Transient Response

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VOUT =5V

A: Output Pin Voltage, 10V/div

B: Output Pin Current, 1A/div

C: Inductor Current, 0.5A/div

D: Output Ripple Voltage, 20 mV/div,

AC-Coupled

Horizontal Time Base: 5 µs/div

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Test Circuit and Layout Guidelines

As in any switching regulator, layout is very important. Rap-

idly 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 con-

struction should be used for best results. When using the

Adjustable version, physically locate the programming resis-

tors near the regulator, to keep the sensitive feedback wiring

short.

LM2575HV Arkusz danych(PDF) 11 Page - National Semiconductor (TI)