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LM2599 Datasheet(PDF) 12 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2599
Description  SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
PDF  31 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2599 Datasheet(HTML) 12 Page - National Semiconductor (TI)

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LM2599 Series Buck Regulator Design Procedure (Fixed Output) (Continued)
LM2599 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) = 3A
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.
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
3
5
22
L41
470/25
560/16
330/6.3
390/6.3
7
22
L41
560/35
560/35
330/6.3
390/6.3
10
22
L41
680/35
680/35
330/6.3
390/6.3
40
33
L40
560/35
470/35
330/6.3
390/6.3
6
22
L33
470/25
470/35
330/6.3
390/6.3
2
10
33
L32
330/35
330/35
330/6.3
390/6.3
40
47
L39
330/35
270/50
220/10
330/10
5
3
8
22
L41
470/25
560/16
220/10
330/10
10
22
L41
560/25
560/25
220/10
330/10
15
33
L40
330/35
330/35
220/10
330/10
40
47
L39
330/35
270/35
220/10
330/10
9
22
L33
470/25
560/16
220/10
330/10
2
20
68
L38
180/35
180/35
100/10
270/10
40
68
L38
180/35
180/35
100/10
270/10
12
3
15
22
L41
470/25
470/25
100/16
180/16
18
33
L40
330/25
330/25
100/16
180/16
30
68
L44
180/25
180/25
100/16
120/20
40
68
L44
180/35
180/35
100/16
120/20
15
33
L32
330/25
330/25
100/16
180/16
2
20
68
L38
180/25
180/25
100/16
120/20
40
150
L42
82/25
82/25
68/20
68/25
FIGURE 2. LM2599 Fixed Voltage Quick Design Component Selection Table
www.national.com
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