VR
20V
Schottky
Fast Recovery
4A–6A
3A
1N5820
4A–6A
1N5823
3A
MBR320P
SR302
30V
40V
1N5821
MBR330
31DQ03
SR303
50WQ03
1N5824
The following
diodes are all
rated to 100V
The following
diodes are all
rated to 100V
1N5822
MBR340
31DQ04
SR304
MBR340
50WQ04
1N5825
50WF10
MUR410
HER602
31DF1
HER302
50V
60V
MBR350
31DQ05
SR305
50WQ05
MBR360
DQ06
50WR06
50SQ060
SR306
FIGURE 8. Diode Selection Guide
Inductor
Code
Inductor
Value
Schott
Pulse Eng.
Renco
(Note 14)
RL2442
RL2443
RL2444
RL1954
RL1953
RL1952
RL1951
RL1950
RL2445
RL2446
RL2447
RL1961
RL1960
RL1959
RL1958
RL2448
(Note 12)
(Note 13)
PE-53112
PE-92114
PE-92108
PE-53113
PE-52626
PE-52627
PE-53114
PE-52629
PE-53115
PE-53116
PE-53117
PE-53118
PE-53119
PE-53120
PE-53121
PE-53122
L47
47 µH
68 µH
671 26980
671 26990
671 27000
671 27010
671 27020
671 27030
671 27040
671 27050
671 27060
671 27070
671 27080
671 27090
671 27100
671 27110
671 27120
671 27130
L68
L100
L150
L220
L330
L470
L680
H150
H220
H330
H470
H680
H1000
H1500
H2200
100 µH
150 µH
220 µH
330 µH
470 µH
680 µH
150 µH
220 µH
330 µH
470 µH
680 µH
1000 µH
1500 µH
2200 µH
Note 12: Schott Corporation, (612) 475-1173, 1000 Parkers Lake Road, Wayzata, MN 55391.
Note 13: Pulse Engineering, (619) 674-8100, P.O. Box 12235, San Diego, CA 92112.
Note 14: Renco Electronics Incorporated, (516) 586-5566, 60 Jeffryn Blvd. East, Deer Park, NY 11729.
FIGURE 9. Inductor Selection by Manufacturer’s Part Number
If the operating temperature range includes temperatures
below −25˚C, the input capacitor value may need to be
larger. With most electrolytic capacitors, the capacitance
value decreases and the ESR increases with lower tempera-
tures and age. Paralleling a ceramic or solid tantalum ca-
pacitor will increase the regulator stability at cold tempera-
tures. For maximum capacitor operating lifetime, the
capacitor’s RMS ripple current rating should be greater than
Application Hints
INPUT CAPACITOR (CIN
)
To maintain stability, the regulator input pin must be by-
passed with at least a 100 µF electrolytic capacitor. The
capacitor’s leads must be kept short, and located near the
regulator.
15
www.national.com
NSC [ National Semiconductor ]
