LM2575HV-12 데이터 시트보기 (PDF) - Unspecified
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LM2575HV-12 Datasheet PDF : 13 Pages
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LM2575HV/LM2576HV/HM2676HV
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
LM2575HV/LM2576HV/HM2676HV
VIN
UNREGULATED
DC INPUT
- +VIN
1
LM2576H2VH-
FEEDBACK
4
FIXED OUTPUT OUTPUT
L1
2
100 H
+ 100 FGND 3 ON/OFF 5
CIN
D1
+
MBR360
VOUT
L
COUT
O
1000
F
A
D
CIN — 100F, 75V, Aluminum Electrolytic
COUT —1000F, 25V, Aluminum Electrolytic
D1 — Schottky, MBR360
L1 — 100H, Pulse Eng. PE-92108
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
Adjustable Output Voltage Version
7V -60V
UNREGULATED
DC INPUT
+VIN
1
LMLM2527557H6VH--AVD- J
LM257A6DHJV-ADJ
FEEDBACK
4
OUTPUT
L1
HM2676HV-ADJ
VOUT
5.00V
2
+ 100 F GND
CIN
3 ON/OFF 5
100 H
D1
+ COUT
R2
L
O
A
MBR360 1000 F
D
R1
R2
VOUT VREF(1 )
R1
VOUT
R2 R1(
1)
VREF
where VREF = 1.23V, R1 between 1k and 5k
FIGURE 2.
10
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