LM2594/LM2594HV Series Buck Regulator Design Procedure (Fixed
Output) (Continued)
Conditions
Inductor
Output Capacitor
Through Hole Surface Mount
Output
Voltage
(V)
Load
Current
(A)
Max Input
Inductance
Inductor
(#)
Panasonic
HFQ Series
(µF/V)
220/16
120/25
120/25
120/35
120/25
120/16
120/16
180/16
180/16
120/25
120/25
82/16
Nichicon
PL Series
(µF/V)
220/16
120/25
120/25
120/35
120/25
120/16
120/16
180/16
180/16
120/25
120/25
82/16
AVX TPS
Series
(µF/V)
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
Sprague
595D Series
(µF/V)
100/6.3
100/6.3
100/6.3
100/6.3
100/6.3
100/6.3
100/6.3
33/25
Voltage
(V)
5
(µH)
3.3
0.5
33
47
L14
L13
L21
L20
L4
7
10
40
6
68
100
68
0.2
0.5
10
40
8
150
220
47
L10
L9
5
L13
L21
L20
L19
L10
L9
10
15
40
9
68
33/25
100
150
150
220
330
68
33/25
33/25
33/25
0.2
0.5
20
40
15
18
30
40
15
20
40
120/16
120/16
82/25
120/16
120/16
82/25
33/25
L8
33/25
12
L21
L19
L27
L26
L11
L9
15/25
150
220
330
100
220
330
82/25
82/25
15/25
82/25
82/25
15/25
82/25
82/25
15/25
82/25
82/25
15/25
0.2
82/25
82/25
15/25
L17
82/25
82/25
15/25
FIGURE 2. LM2594/LM2594HV Fixed Voltage Quick Design Component Selection Table
LM2594/LM2594HV Series Buck Regulator Design Procedure (Adjustable
Output)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
Given:
Given:
=
=
VOUT 20V
VOUT Regulated Output Voltage
=
=
VIN(max) 28V
VIN(max) Maximum Input Voltage
=
=
ILOAD(max) 0.5A
ILOAD(max) Maximum Load Current
=
=
Switching Frequency (Fixed at a nominal 150 kHz).
F
Switching Frequency (Fixed at a nominal 150 kHz).
F
11
www.national.com
NSC [ National Semiconductor ]
