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參數(shù)資料
| 型號： | LM2575-5.0BUT&R |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封裝： | TO-263, 5 PIN |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 152K |
| 代理商： | LM2575-5.0BUT&R |
Micrel, Inc.
LM2575
May 2009
9
M9999-051209-B
Functional Characteristics (circuit of Figure 1)
Load Transient Response
100s/div.
+100mV
0
–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: 5s/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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