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LM2575-12BT ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 9 Page - Micrel Semiconductor

๋ถ€ํ’ˆ๋ช… LM2575-12BT
์ƒ์„ธ๋‚ด์šฉ  52kHz Simple 1A Buck Regulator
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์ œ์กฐ์‚ฌ  MICREL [Micrel Semiconductor]
ํ™ˆํŽ˜์ด์ง€  http://www.micrel.com
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LM2575-12BT ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 9 Page - Micrel Semiconductor

 
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Micrel, Inc.
LM2575
May 2009
9
M9999-051209-B
Functional Characteristics (circuit of Figure 1)
Load Transient Response
100ยตs/div.
+100mV
0
โ€“100mV
Output
Voltage
Change
1.0A
0.5A
0
Output
Current
VOUT = 5V
Switching Waveforms
10V
0
1A
0
1A
.5A
0
A
B
C
D
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: 5ยตs/div
VOUT = 5V VIN = 20V
Functional Diagrams
ON/OFF
COMPARATOR
FIXED GAIN
ERROR AMP
1 AMP
SWITCH
OUT
DRIVER
+
-
+
-
VIN
FB
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
3.1k
1.0k
4
Fixed Regulator
ON/OFF
COMPARATOR
FIXED GAIN
ERROR AMP
1 AMP
SWITCH
OUT
DRIVER
+
-
+
-
VIN
FB
1.23V
BAND-GAP
REFERENCE
52 kHz
OSCILLATOR
RESET
THERMAL
SHUTDOWN
CURRENT
LIMIT
5
2
3
1
4
INTERNAL
REGULATOR
ON/OFF
GND
Adjustable Regulator


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