LM2576 View Datasheet(PDF) - Estek Electronics Co. Ltd
Part Name
Description
Manufacturer
LM2576 Datasheet PDF : 8 Pages
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LM2576 Series
Test Circuit and Layout Guidelines
As in any switching regulator, layout is very important. Rapidly 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 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.
Fixed Output Voltage Versions (Figure 2a)
VIN
UNREGULATED
DC INPUT
FEEDBACK
+VIN MIK2576HV- 4
1 FIXED OUTPUT OUTPUT
L1
+ GN100
F
2
D
3
ON/OFF
5
100
H
+
D1
MBR360
VOUT
L
COUT
O
1000
A
F
D
CIN — 100µF, 75V, Aluminum Electrolytic
COUT — 1000µF, 25V, Aluminum Electrolytic
D1 — Schottky, MBR360
L1 — 100µH, Pulse Eng. PE-92108
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
Adjustable Output Voltage Version (Figure 2b)
7V -60V
UNREGULATED
DC INPUT
+VIN MIK2576HV-
ADJ
1
+ 100 FGND 3
5
CIN
ON/OFF
FEEDBACK
4
L1
OUTPUT
2
100
H
COUT
+
MBR360
1000
F
VOUT
5.00V
L
R2
O
A
D
R1
VOUT
=
VREF 1(
+
R
2)
R
R
2
R1 (VVROEFUT− )1
where VREF = 1.23V, R1 between 1k and 5k
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