LM2576-12WT Ver la hoja de datos (PDF) - Micrel
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LM2576-12WT Datasheet PDF : 9 Pages
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LM2576
Test Circuits and Layout Guidelines
Micrel, Inc.
FEEDBACK
+VIN
4
LM2575
L1
1
OUTPUT
7V - 40V
UNREGULATED
+
100 µF
GND 3
ON/OFF 5
2
DC INPUT
CIN
330 µH
D1
MBR360
+ COUT
470µF
VOUT
5.00V
R2 L
O
A
R1 D
CIN — 100µF, 75V Aluminum Electrolytic
COUT — 470µF, 15V Aluminum Electrolytic
D1 — Schottky, MBR360
L1 — 330µH, 415-0926 (AIE)
R1 — 1k, 0.01%
R2 — 3.065k, 0.01%
5-pin TO-220 socket—2936 (Loranger Mfg. Co.)
4-pin TO-3 socket—8112-AG7 (Augat Inc.)
FEEDBACK
+VIN
4
LM2575-5.0
L1
1
OUTPUT
7V - 40V
UNREGULATED
+
100 µF
GND 3
ON/OFF 5
2
DC INPUT
CIN
330 µH
D1
11DQ06
VOUT
5.00V
+ COUT
L
220µF
O
A
D
CIN — 100µF, 75V Aluminum Electrolytic
COUT — 330µF, 15V Aluminum Electrolytic
D1 — Schottky, 11DQ06
L1 — 100µH, 415-0926 (AIE)
5-pin TO-220 socket—2936 (Loranger Mfg. Co.)
4-pin TO-3 socket—8112-AG7 (Augat Inc.)
Note: Pin numbers are for TO-220 Package
Figure 1.
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 stray 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.
Block Diagrams
VIN 1
FEED-
BACK
4
INTERNAL
REGULATOR
FIXED GAIN
3.1k
ERROR AMP
+
1.0k
-
COMPARATOR
+
-
ON/OFF
3 AMP
SWITCH
DRIVER
1.23V
BAND-GAP
REFERENCE
52 kHz
OSCILLATOR
RESET
THERMAL
SHUTDOWN
CURRENT
LIMIT
5 ON/OFF VIN 1
INTERNAL
REGULATOR
ON/OFF
FEED-
BACK 4
2 OUTPUT
FIXED GAIN
ERROR AMP
+
COMPARATOR
-
+
-
3 AMP
SWITCH
DRIVER
3 GND
1.23V
BAND-GAP
REFERENCE
52 kHz
OSCILLATOR
RESET
THERMAL
SHUTDOWN
CURRENT
LIMIT
5 ON/OFF
2 OUTPUT
3 GND
Note: Pin numbers are for the TO-220 package
Fixed Regulator
Adjustable Regulator
M9999-082605-B
8
August 2005
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