LM2575T-12/NOPB National Semiconductor, LM2575T-12/NOPB Datasheet - Page 16
![IC REG SIMPLE SWITCHER TO-220-5](/photos/7/60/76069/pkg_t05a_drawing__14_sml.jpg)
LM2575T-12/NOPB
Manufacturer Part Number
LM2575T-12/NOPB
Description
IC REG SIMPLE SWITCHER TO-220-5
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheet
1.LM2575S-5.0NOPB.pdf
(28 pages)
Specifications of LM2575T-12/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
12V
Current - Output
1A
Frequency - Switching
52kHz
Voltage - Input
4 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Straight Leads)
Primary Input Voltage
25V
No. Of Outputs
1
Output Voltage
5V
Output Current
1A
No. Of Pins
5
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Filter Terminals
Through Hole
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Other names
*LM2575T-12
*LM2575T-12/NOPB
LM2575T-12
*LM2575T-12/NOPB
LM2575T-12
www.national.com
4. Catch Diode Selection (D1)
A. The catch-diode current rating must be at least 1.2 times greater
than the maximum load current. Also, if the power supply design
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 diode selection guide in Figure 8.
B. The reverse voltage rating of the diode should be at least 1.25
times the maximum input voltage.
5. Input Capacitor (C
An aluminum or tantalum electrolytic bypass capacitor located
close to the regulator is needed for stable operation.
To further simplify the buck regulator design procedure, National Semiconductor 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 National Semiconductor sales office in your area.
PROCEDURE (Adjustable Output Voltage Versions)
IN
)
16
4. Catch Diode Selection (D1)
A. For this example, a 3A current rating is adequate.
B. Use a 40V MBR340 or 31DQ04 Schottky diode, or any of the
suggested fast-recovery diodes in Figure 8.
5. Input Capacitor (C
A 100 μF aluminum electrolytic capacitor located near the input and
ground pins provides sufficient bypassing.
EXAMPLE (Adjustable Output Voltage Versions)
IN
)