LM2575D2T-5 데이터 시트보기 (PDF) - ON Semiconductor

부품명

상세내역

제조사

LM2575D2T-5

1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator

ON Semiconductor 

LM2575, NCV2575

+

Vin

Unregulated

DC Input

8.0 V - 40 V

5.0 Output Voltage Versions

Feedback

Vin

1

LM2575−5

4

Output

L1

330 mH

3 GND

Cin

100 mF/50 V

2

5 ON/OFF

D1

1N5819

Vout

Regulated

Output

Cout

330 mF

/16 V

Load

-

+

Unregulated

DC Input

8.0 V - 40 V

Adjustable Output Voltage Versions

Feedback

Vin

LM2575

4

1

Adjustable

Output

3 GND

Cin

100 mF/50 V

2

5 ON/OFF

L1

330 mH

D1

1N5819

Cout

330 mF

/16 V

-

ǒ Ǔ Vout + Vref 

1

) 

R2

R1

ǒ Ǔ R2 + R1

Vout

Vref

  1

Where Vref = 1.23 V, R1

between 1.0 kW and 5.0 kW

Figure 14. Typical Test Circuit

Vout

Regulated

Output

R2

Load

R1

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 14, 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 2

(emitter of the internal switch) of the LM2575 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

LM2575 regulator.

http://onsemi.com

7

Share Link: