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LM2575-3.3WT データシート(PDF) 7 Page - Micrel Semiconductor

部品番号 LM2575-3.3WT
部品情報  52kHz Simple 1A Buck Regulator
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メーカー  MICREL [Micrel Semiconductor]
ホームページ  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

LM2575-3.3WT データシート(HTML) 7 Page - Micrel Semiconductor

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April 2005
7
M9999-042205
LM2575
Micrel, Inc.
LM2575
+
100 µF
+VIN
1
3
GND
5
ON/OFF
2
OUTPUT
4
FEEDBACK
L1
330 µH
+
D1
MBR360
COUT
470µF
R2
R1
VOUT
5.00V
7V - 40V
UNREGULATED
DC INPUT
CIN
L
O
A
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.)
LM2575-5.0
+
100 µF
+VIN
1
3
GND
5
ON/OFF
2
OUTPUT
4
FEEDBACK
L1
330 µH
+
D1
MBR360
COUT
220µF
VOUT
5.00V
Note: Pin numbers are for TO-220 Package
7V - 40V
UNREGULATED
DC INPUT
CIN
CIN — 100µF, 75V Aluminum Electrolytic
COUT — 330µF, 15V Aluminum Electrolytic
D1 — Schottky, MBR360
L1 — 330µH, 415-0926 (AIE)
5-pin TO-220 socket—2936 (Loranger Mfg. Co.)
4-pin TO-3 socket—8112-AG7 (Augat Inc.)
L
O
A
D
ON/OFF
COMPARATOR
FIXED GAIN
ERROR AMP
1 AMP
SWITCH
OUTPUT
DRIVER
+
-
+
-
VIN
FEED-
BACK
1.23V
BAND-GAP
REFERENCE
52 kHz
OSCILLATOR
RESET
THERMAL
SHUTDOWN
CURRENT
LIMIT
5
2
3
1
Note: Pin numbers are for the TO-220 package
INTERNAL
REGULATOR
ON/OFF
GND
ON/OFF
COMPARATOR
FIXED GAIN
ERROR AMP
1 AMP
SWITCH
OUTPUT
DRIVER
+
-
+
-
VIN
FEED-
BACK
1.23V
BAND-GAP
REFERENCE
52 kHz
OSCILLATOR
RESET
THERMAL
SHUTDOWN
CURRENT
LIMIT
5
2
3
1
4
INTERNAL
REGULATOR
ON/OFF
GND
3.1k
1.0k
4
Typical Performance Characteristics (Circuit of Figure 1)
Block Diagrams
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.
Switching Waveforms
10V
0
1A
0
1A
.5A
0
A
B
C
D
Load Transient Response
100µS/div.
+100mV
0
–100mV
Output
Voltage
Change
1.0A
0.5A
0
Output
Current
VOUT = 5V
A: Output pin voltage 10V/div
B: Output pin current 1A/div
C: Inductor current 0.5A/div
D: Output ripple voltage 20 mV/div. AC coupled
Horizontal Time Base: 5µs/div
VOUT = 5V VIN = 20V
Fixed Regulator
Adjustable Regulator
Test Circuits and Layout Guidelines
Figure 1.


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