LM1575, LM2575-N, LM2575HV
SNVS106E –MAY 1999–REVISED APRIL 2013
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PROCEDURE (Adjustable Output Voltage Versions)
4. Catch Diode Selection (D1)
EXAMPLE (Adjustable Output Voltage Versions)
4. Catch Diode Selection (D1)
A. The catch-diode current rating must be at least 1.2 times greater A. For this example, a 3A current rating is adequate.
than the maximum load current. Also, if the power supply design
B. Use a 40V MBR340 or 31DQ04 Schottky diode, or any of the
suggested fast-recovery diodes in Table 1.
must withstand a continuous output short, the diode should have a
current rating equal to the maximum current limit of the LM2575. The
most stressful condition for this diode is an overload or shorted
output. See Table 1.
B. The reverse voltage rating of the diode should be at least 1.25
times the maximum input voltage.
5. Input Capacitor (CIN
An aluminum or tantalum electrolytic bypass capacitor located close A 100 μF aluminum electrolytic capacitor located near the input and
to the regulator is needed for stable operation. ground pins provides sufficient bypassing.
)
5. Input Capacitor (CIN)
To further simplify the buck regulator design procedure, TI is making available computer design software to be
used with the Simple Switcher line of switching regulators. Switchers Made Simple (version 3.3) is available on
a (3½″) diskette for IBM compatible computers from a TI sales office in your area.
Table 1. Diode Selection Guide
Schottky
Fast Recovery
VR
1A
3A
1A
3A
20V
30V
1N5817
MBR120P
SR102
1N5820
MBR320
SR302
The following
diodes are all
rated to 100V:
The following
diodes are all
rated to 100V:
1N5818
MBR130P
11DQ03
SR103
1N5821
MBR330
31DQ03
SR303
11DF1
MUR110
HER102
31DF1
MURD310
HER302
40V
1N5819
MBR140P
11DQ04
SR104
IN5822
MBR340
31DQ04
SR304
50V
60V
MBR150
11DQ05
SR105
MBR350
31DQ05
SR305
MBR160
11DQ06
SR106
MBR360
31DQ06
SR306
Table 2. Inductor Selection by Manufacturer's Part Number
(1)
(2)
(3)
Inductor Code
L100
Inductor Value
100 μH
Schott
Pulse Eng.
PE-92108
PE-53113
PE-52626
PE-52627
PE-53114
PE-52629
PE-53115
PE-53116
PE-53117
PE-53118
PE-53119
PE-53120
Renco
67127000
67127010
67127020
67127030
67127040
67127050
67127060
67127070
67127080
67127090
67127100
67127110
RL2444
RL1954
RL1953
RL1952
RL1951
RL1950
RL2445
RL2446
RL2447
RL1961
RL1960
RL1959
L150
150 μH
L220
220 μH
L330
330 μH
L470
470 μH
L680
680 μH
H150
150 μH
H220
220 μH
H330
330 μH
H470
470 μH
H680
680 μH
H1000
1000 μH
(1) Schott Corp., (612) 475-1173, 1000 Parkers Lake Rd., Wayzata, MN 55391.
(2) Pulse Engineering, (619) 674-8100, P.O. Box 12236, San Diego, CA 92112.
(3) Renco Electronics Inc., (516) 586-5566, 60 Jeffryn Blvd. East, Deer Park, NY 11729.
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