LM2574 datasheet(21/26 Pages) ONSEMI

21 / 26 page

LM2574, NCV2574

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15 k

1N5242

15 k

2N3904

68 k

Cin

LM2574−XX

and

Gnds

Pins

ON/OFF

+Vin

-Vout

NOTE: This picture does not show the complete circuit (see Figure 27).

Figure 34. Undervoltage Lockout Circuit for

Buck−Boost Converter

(5)

(12)

(4)

and

(6)

Adjustable Output, Low−Ripple Power Supply

A 0.5 A output current capability power supply that

features an adjustable output voltage is shown in Figure 35.

This regulator delivers 0.5 A into 1.2 to 35 V output. The

input voltage ranges from roughly 3.0 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.

1N5819

150

Output

Feedback

50 k

1.1 k

Output

Voltage

1.2 to 35 V @ 0.5 A

Optional Output

Ripple Filter

40 V Max

Unregulated

DC Input

Cout

1000

100

Cin

LM2574−ADJ

4ON/OFF

Pwr

Gnd

+Vin

Sig

Gnd

Figure 35. 1.2 to 35 V Adjustable 500 mA Power Supply with Low Output Ripple

(12)

(5)

(3)

(14)

(6)

(4)

LM2574 Datasheet(PDF) 21 Page - ON Semiconductor

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