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LM2595 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2595
Description  SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
PDF  29 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2595 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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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)
(µF/V)
(µF/V)
(µF/V)
3.3
1
5
22
L24
330/16
330/16
220/10
330/10
7
33
L23
270/25
270/25
220/10
270/10
10
47
L31
220/25
220/35
220/10
220/10
40
68
L30
180/35
220/35
220/10
180/10
6
47
L13
220/25
220/16
220/10
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
330/16
220/10
270/10
10
47
L31
220/25
220/25
220/10
220/10
15
68
L30
180/35
180/35
220/10
150/16
40
100
L29
180/35
120/35
100/16
120/16
9
68
L21
180/16
180/16
220/10
150/16
0.5
20
150
L19
120/25
1200/25
100/16
100/20
40
150
L19
100/25
100/25
68/20
68/25
12
1
15
47
L31
220/25
220/25
68/20
120/20
18
68
L30
180/35
120/25
68/20
120/20
30
150
L36
82/25
82/25
68/20
100/20
40
220
L35
82/25
82/25
68/20
68/25
15
68
L21
180/25
180/25
68/20
120/20
0.5
20
150
L19
82/25
82/25
68/20
100/20
40
330
L26
56/25
56/25
68/20
68/25
FIGURE 2. LM2595 Fixed Voltage Quick Design Component Selection Table
www.national.com
11



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