LM2574 datasheet(8/28 Pages) ONSEMI

Teilenummer	LM2574

Bauteilbeschribung	0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator

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LM2574

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Figure 16. Test Circuit and Layout Guidelines

D1

1N5819

L1

330 µH

Output

7

1

Feedback

Cout

220 µF

Cin

22 µF

LM2574

Fixed Output

1

3

4ON/OFF

Pwr

Gnd

Vin

Load

Vout

D1

1N5819

L1

330 µH

Output

7

1

Feedback

Cout

220 µF

Cin

22 µF

LM2574

Adjustable

1

Vin

Load

Vout

5.0 V

Fixed Output Voltage Versions

Adjustable Output Voltage Versions

Vout + Vref 1.0 )

R2

R1

R2 + R1

Vout

Vref

1.0

Where Vref = 1.23 V, R1

between 1.0 kΩ and 5.0 kΩ

R2

6.12 k

R1

2.0 k

7.0 - 40 V

Unregulated

DC Input

2 Sig

Gnd

3

4ON/OFF

Pwr

Gnd

2 Sig

Gnd

7.0 V - 40 V

Unregulated

DC Input

Cin

–22

µF, 60 V, Aluminium Electrolytic

Cout –

220

µF, 25 V, Aluminium Electrolytic

D1

–

Schottky, 1N5819

L1

–

330

µH, (For 5.0 Vin, 3.3 Vout, use 100 µH)

R1

–

2.0 k, 0.1%

R2

–

6.12 k, 0.1%

NOTE: Pin numbers in ( ) are for the SO–16W package.

(12)

(3)

(6)

(4)

(5)

(14)

(12)

(3)

(14)

(6)

(4)

(5)

PCB LAYOUT GUIDELINES

As in any switching regulator, the layout of the printed

circuit board is very important. Rapidly switching currents

associated with wiring inductance, stray capacitance and

parasitic inductance of the printed circuit board traces can

generate

voltage

transients

which

can

generate

electromagnetic interferences (EMI) and affect the desired

operation. As indicated in the Figure 16, to minimize

inductance and ground loops, the length of the leads

indicated by heavy lines should be kept as short as possible.

For best results, single–point grounding (as indicated) or

ground plane construction should be used.

On the other hand, the PCB area connected to the Pin 7

(emitter of the internal switch) of the LM2574 should be

kept to a minimum in order to minimize coupling to sensitive

circuitry.

Another sensitive part of the circuit is the feedback. It is

important to keep the sensitive feedback wiring short. To

assure this, physically locate the programming resistors near

to the regulator, when using the adjustable version of the

LM2574 regulator.

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