LM2575 Ver la hoja de datos (PDF) - First Components International

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LM2575

1.0A Step - Down Voltage Switching Regulators

First Components International 

LM2575 1.0A Step - Down Voltage Switching Regulators

TEST CIRCUIT AND LAYOUT GUIDELINES

Careful layout is important with any switching regulator. Rapidly switching currents associated with wiring

inductance generate voltage transients, which can cause problems. To minimize inductance and ground loops,

the lengths of the leads indicated by heavy lines in Figure 1 below should be kept as short as possible. Single-

point grounding (as indicated in Figure 1) or ground plane construction should be used for best results. When

using the Adjustable version, place the programming resistors as close as possible to LM2575, to keep the

sensitive feedback wiring short.

Figure 1(a). Fixed Output Voltage Versions

+VIN

LM2575

Feedback

4

1 FIXED OUTPUT Output

L1

VOUT

VIN

Unregulated

DC Input

GND 3

+

CIN

100 µF

2

ON/OFF 5

330 µH

+

L

D1

O

MBR360

COUT

A

330 µF

D

CIN - 100 µF, 75V, Aluminum Electrolytic

COUT - 330 µF, 25V, Aluminum Electrolytic

D1 - Schottky, MBR360

L1 - 330 µH, 3L Electronic Corp. TC-331M-1.0A- 5026

R1 - 2k, 0.1%

R2 - 6.12k, 0.1%

6

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