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LM2575-12BT ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 7 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) 7 Page - Micrel Semiconductor

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Micrel, Inc.
LM2575
May 2009
7
M9999-051209-B
Typical Characteristics (circuit of Figure 1)
Supply Current
INPUT VOLTAGE ( V)
20
Measured at
Ground Pin
TJ
VOUT = 5V
18
16
14
12
10
8
6
4
0
10
203040
5060
I
LO AD to 1A
Supply Current
vs. Duty Cycle
DUTY CYC LE ( %)
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.0
0
020
40
60
80
100
VIN from 7V to 40V
ILOAD= 200 mA
200
150
100
50
0
-75
VIN= 12V
Standby
Quiescent Current
VIN = 40V
-50 -25 0 25 50 75 100 125150
Current Limit
3
2
1
0
-75
VIN = 25V
INPUT VOLTAGE ( V)
100
Efficiency
VOUT = 12V
-50 -25 0 25 50 75 100125 150
95
90
85
80
75
70
65
60
200 mA
200 mA
V
OUT = 3V
1A
0
5 10 15 20 25 30 35 40
Minimum Operating
Voltage
5.0
ILOAD= 200 mA
Line Regulation
INPUT VOLTAGE (V)
14
0
100
-100
-75
Feedback Pin Current
-50 -25 0 25 50 75 100 125150
VOUT= 1.23V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-75 -50 -25 0
25 50 75 100125150
12
10
8
6
4
2
0
-2
-4
-6
5
10
15
202530
75
50
25
0
-25
-50
-75
+8
-8
-75
Oscillator Frequency
-50 -25 0 25 50 75 100125150
+6
+4
+2
0
-2
-4
--6
VIN = 12V
VIN = 40V
Normalized at 25C
Normalized toVIN = 10V
VOUT = 5V
I
LO AD = 500mA
TJ = 25
VON/OFF= 5V
Switch
Saturation Voltage
SW I TCH CURREN T (A)
1.2
-55 C
1.0
0.8
0.6
0.4
0
0.20.4
0.60.8
1.0
25 C
125 C
150 C
-40 C
Dropout Voltage
2.0
-75 -50 -25 0 25 50 75 100125150
VOUT = 5%
RIND = 0.2
ILOAD= 1A
I LOAD= 200 mA
1.5
1.0
0.5
0
Normalized
Output Voltage
100
75
50
25
0
-25
-50
-75
-100
-75 -50 -25 0 25 50 75 100125150
VIN = 12V
ILOAD = 200mA
Normalized toTJ = 25 C
1A


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