LM2574M-12 National Semiconductor, LM2574M-12 Datasheet - Page 12

• Manufacturer Part Number: LM2574M-12
• Description: IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,SOP,14PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LM2574M-12

• Rohs Compliant: NO

Test Circuit and Layout Guidelines
C
C
D1 — Schottky, 11DQ06
L1 — 330 µH, 52627
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
As in any switching regulator, layout is very important. Rap-
idly switching currents associated with wiring inductance
generate voltage transients which can cause problems. For
minimal inductance and ground loops, the length of the leads
indicated by heavy lines should be kept as short as
IN
OUT
— 22 µF, 75V
— 220 µF, 25V
Aluminum Electrolytic
Aluminum Electrolytic
(for 5V in, 3.3V out, use
100 µH, RL-1284-100)
Adjustable Output Voltage Version
Fixed Output Voltage Versions
FIGURE 2.
11
possible. Single-point grounding (as indicated) or ground
plane construction should be used for best results. When
using the Adjustable version, physically locate the program-
ming resistors near the regulator, to keep the sensitive feed-
back wiring short.
01139411
01139412
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