LM2575 datasheet(21/26 Pages) ONSEMI

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LM2575

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Figure 32. Undervoltage Lockout Circuit for

Buck−Boost Converter

15 k

1N5242B

15 k

2N3904

68 k

Vth ≈ 13 V

Cin

100

LM2575−5.0

GND

ON/OFF

+Vin

Vout = −5.0 V

NOTE: This picture does not show the complete circuit.

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.

Figure 33. Adjustable Power Supply with Low Ripple Voltage

1N5819

150

Output

Feedback

50 k

1.1 k

Regulated

Output Voltage

1.2 V to 35 V @1.0 A

Optional Output

Ripple Filter

Unregulated

DC Input

Cout

2200

100

Cin

100

/50 V

LM2575−Adj

3ON/OFF

GND

+Vin

1.0

1.5

2.0

2.5

3.0

3.5

010

5.0

L, LENGTH OF COPPER (mm)

Minimum

Size Pad

2.0 oz. Copper

Free Air

Mounted

Vertically

Figure 34. D2PAK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

PD(max) for TA = 50°C

RqJA

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