LM2576

http://onsemi.com

23

THE LM2576−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

−

1000

mF, 16 V, Aluminium Electrolytic

D1

−

3.0 A, 40 V, Schottky Rectifier, 1N5822

L1

−

150

mH, RL2444, Renco Electronics

R1

−

1.8 k

W, 0.25 W

R2

−

10 k

W, 0.25 W

Figure 38. Schematic Diagram of the 8.0 V @ 3.0 A Step−Down Converter Using the LM2576−ADJ

R1 is between 1.0 k and 5.0 k

D1

1N5822

L1

150

mH

Output

2

R2

10 k

R1

1.8 k

Regulated

Output Filtered

Unregulated

DC Input

C2

1000

mF

/16 V

C1

100

mF

/50 V

LM2576−ADJ

1

5

3ON/OFF

GN

D

4

Feedback

R2

R1

ON/OFF

Figure 39. Printed Circuit Board Layout

Component Side

Figure 40. Printed Circuit Board Layout

Copper Side

LM2576

U1

D1

R1

R2

C1

+

C2

+

L1

ON/OFF

NOTE: Not to scale.

NOTE: Not to scale.

References