LM2575T-5.0 National Semiconductor, LM2575T-5.0 Datasheet - Page 12
LM2575T-5.0
Manufacturer Part Number
LM2575T-5.0
Description
Voltage Regulator IC
Manufacturer
National Semiconductor
Specifications of LM2575T-5.0
Input Voltage
40V
Output Current
1A
Output Voltage
5V
No. Of Outputs
1
No. Of Pins
5
Operating Temperature Range
-40°C To +125°C
Termination Type
Through Hole
Mounting Type
Through Hole
Dc
0848
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Test Circuit and Layout Guidelines
As in any switching regulator, layout is very important. Rapidly
switching currents associated with wiring inductance gener-
ate voltage transients which can cause problems. For minimal
inductance and ground loops, the length of the leads indicated
C
C
D1 — Schottky, 11DQ06
L1 — 330 μH, PE-52627 (for 5V in, 3.3V out, use 100 μH, PE-92108)
where V
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
Note: Pin numbers are for the TO-220 package.
IN
OUT
— 100 μF, 75V, Aluminum Electrolytic
— 330 μF, 25V, Aluminum Electrolytic
REF
= 1.23V, R1 between 1k and 5k.
Adjustable Output Voltage Version
Fixed Output Voltage Versions
FIGURE 2.
12
by heavy lines should be kept as short as possible. Single-
point grounding (as indicated) or ground plane construction
should be used for best results. When using the Adjustable
version, physically locate the programming resistors near the
regulator, to keep the sensitive feedback wiring short.
1147508
1147509