LM2575

http://onsemi.com

23

THE LM2575−ADJ STEP−DOWN VOLTAGE REGULATOR WITH 8.0 V @ 1.0 A OUTPUT POWER

CAPABILITY. TYPICAL APPLICATION WITH THROUGH−HOLE PC BOARD LAYOUT

C1

−

100

mF, 50 V, Aluminium Electrolytic

C2

−

330

mF, 16 V, Aluminium Electrolytic

C3

−

100

mF, 16 V, Aluminium Electrolytic

D1

−

1.0 A, 40 V, Schottky Rectifier, 1N5819

L1

−

330

mH, Tech 39: 77 458 BV, Toroid Core, Through−Hole, Pin 3 = Start, Pin 7 = Finish

L2

−

25

mH, TDK: SFT52501, Toroid Core, Through−Hole

R1

−

1.8 k

R2

−

10 k

Figure 38. Schematic Diagram of the 8.0 V @ 1.0 V Step−Down Converter Using the LM2575−Adj

(An additional LC filter is included to achieve low output ripple voltage)

Figure 39. PC Board Component Side

Figure 40. PC Board Copper Side

R1 is between 1.0 k and 5.0 k

D1

1N5819

L1

330

mH

Output

2

R2

10 k

R1

1.8 k

L2

25

mH

Regulated

Output Filtered

Unregulated

DC Input

C2

330

mF

/16 V

C3

100

mF

/16 V

C1

100

mF

/50 V

LM2575−Adj

1

5

3ON/OFF

GND

4

Feedback

Regulated

Output Unfiltered

R2

R1

C1

L1

C2

D1

J1

U1 LM2575

L2

C3

R2 R1

NOTE: Not to scale.

NOTE: Not to scale.

References