LM2575 Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

LM2575

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

ON Semiconductor 

LM2575

+Vin

R2

R3

15 k 68 k

+Vin

LM2575−5.0

1

Cin

100 mF 5 ON/OFF 3 GND

Z1

1N5242B

R1

15 k

Q1

2N3904

Vth ≈ 13 V

Vout = −5.0 V

Adjustable Output, Low−Ripple Power Supply

A 1.0 A output current capability power supply that

features an adjustable output voltage is shown in Figure 33.

This regulator delivers 1.0 A into 1.2 V to 35 V output.

The input voltage ranges from roughly 8.0 V to 40 V. In order

to achieve a 10 or more times reduction of output ripple, an

additional L−C filter is included in this circuit.

NOTE: This picture does not show the complete circuit.

Figure 32. Undervoltage Lockout Circuit for

Buck−Boost Converter

Unregulated

DC Input

+

Feedback

+Vin

4

LM2575−Adj

1

Output

L1

150 mH

L2

20 mH

Regulated

Output Voltage

Cin

100 mF

/50 V

2

3 GND 5 ON/OFF

D1

1N5819

R2

50 k

Cout

2200 mF

R1

1.1 k

C1

100 mF

1.2 V to 35 V @1.0 A

Optional Output

Ripple Filter

Figure 33. Adjustable Power Supply with Low Ripple Voltage

80

3.5

PD(max) for TA = 50°C

70

Free Air

Mounted

Vertically

60

50

Minimum

Size Pad

40

RqJA

3.0

2.0 oz. Copper 2.5

L

ÎÎÎÎÎÎÎÎ2.0

L

ÎÎÎÎÎÎÎÎ1.5

30

1.0

0

5.0

10

15

20

25

30

L, LENGTH OF COPPER (mm)

Figure 34. D2PAK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

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