LM2595J-5.0-QML datasheet(11/29 Pages) NSC

부품명	LM2595J-5.0-QML

상세설명	SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator

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제조업체	NSC [National Semiconductor (TI)]

홈페이지	http://www.national.com

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LM2595 Series Buck Regulator Design Procedure (Fixed Output) (Continued)

LM2595 Series Buck Regulator Design Procedure (Adjustable Output)

PROCEDURE (Adjustable Output Voltage Version)

EXAMPLE (Adjustable Output Voltage Version)

Given:

V

OUT = Regulated Output Voltage

V

IN(max) = Maximum Input Voltage

I

LOAD(max) = Maximum Load Current

F = Switching Frequency

(Fixed at a nominal 150 kHz).

Given:

V

OUT = 20V

V

IN(max) = 28V

I

LOAD(max) = 1A

F = Switching Frequency

(Fixed at a nominal 150 kHz).

1. Programming Output Voltage (Selecting R

1 and R2,as

shown in

Figure 1)

Use the following formula to select the appropriate resistor

values.

Select a value for R

1 between 240Ω and 1.5 kΩ. The lower

resistor values minimize noise pickup in the sensitive feed-

back pin. (For the lowest temperature coefficient and the best

stability with time, use 1% metal film resistors.)

1. Programming Output Voltage (Selecting R

1 and R2,as

shown in

Figure 1)

Select R

1 to be 1 kΩ,1%. Solve for R2.

R

2 = 1k (16.26 − 1) = 15.26k, closest 1% value is 15.4 kΩ.

R

2 = 15.4 kΩ.

Procedure continued on next page.

Example continued on next page.

Conditions

Inductor

Output Capacitor

Through Hole Electrolytic

Surface Mount Tantalum

Output

Load

Max Input

Inductance

Inductor

Panasonic

Nichicon

AVX TPS

Sprague

Voltage

Current

Voltage

(µH)

(#)

HFQ Series

PL Series

Series

595D Series

(V)

(A)

(V)

(µF/V)

3.3

1

5

22

L24

330/16

220/10

330/10

7

33

L23

270/25

220/10

270/10

10

47

L31

220/25

220/35

220/10

40

68

L30

180/35

220/35

220/10

180/10

6

47

L13

220/25

220/16

220/10

0.5

10

68

L21

150/35

150/25

100/16

150/16

40

100

L20

150/35

82/35

100/16

100/20

5

1

8

33

L28

330/16

220/10

270/10

10

47

L31

220/25

220/10

15

68

L30

180/35

220/10

150/16

40

100

L29

180/35

120/35

100/16

120/16

9

68

L21

180/16

220/10

150/16

0.5

20

150

L19

120/25

1200/25

100/16

100/20

40

150

L19

100/25

68/20

68/25

12

1

15

47

L31

220/25

68/20

120/20

18

68

L30

180/35

120/25

68/20

120/20

30

150

L36

82/25

68/20

100/20

40

220

L35

82/25

68/20

68/25

15

68

L21

180/25

68/20

120/20

0.5

20

150

L19

82/25

68/20

100/20

40

330

L26

56/25

68/20

68/25

FIGURE 2. LM2595 Fixed Voltage Quick Design Component Selection Table

www.national.com

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