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LM2575-5.0BU Arkusz danych(PDF) 6 Page - Micrel Semiconductor

Numer części LM2575-5.0BU
Szczegółowy opis  52kHz Simple 1A Buck Regulator
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Producent  MICREL [Micrel Semiconductor]
Strona internetowa  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

LM2575-5.0BU Arkusz danych(HTML) 6 Page - Micrel Semiconductor

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M9999-042205
6
April 2005
LM2575
Micrel, Inc.
Typical Performance Characteristics (continued) (Circuit of Figure 1)
Supply Current
INPUT VOLTAGE (V)
20
Measured at
Ground Pin
TJ = 25˚C
VOUT = 5V
18
16
14
12
10
8
6
4
010
20
3040
5060
ILOAD to 1A
Supply Current
vs. Duty Cycle
DUTY CYCLE (%)
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0
020
40
6080
100
VIN from 7V to 40V
ILOAD = 200 mA
JUNCTION TEMPERATURE (˚C)
200
150
100
50
0
-75
VIN = 12V
Standby
Quiescent Current
VIN = 40V
-50 -25
0 25 50 75 100 125 150
Current Limit
JUNCTION TEMPERATURE (˚C)
3
2
1
0
-75
VIN = 25V
INPUT VOLTAGE (V)
100
Efficiency
VOUT = 12V
-50 -25
0 25 50 75 100 125 150
95
90
85
80
75
70
65
60
200 mA
200 mA
VOUT = 3V
1A
05
10 15 20 25 30
35 40
Minimum Operating
Voltage
JUNCTION TEMPERATURE (˚C)
5.0
ILOAD = 200 mA
Line Regulation
INPUT VOLTAGE (V)
14
0
JUNCTION TEMPERATURE (˚C)
100
-100
-75
Feedback Pin Current
-50 -25 0
25 50 75 100 125 150
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 75 100 125 150
12
10
8
6
4
2
0
-2
-4
-6
510
15
202530
75
50
25
0
-25
-50
-75
JUNCTION TEMPERATURE (˚C)
+8
-8
-75
Oscillator Frequency
-50 -25
0 25 50 75 100 125 150
+6
+4
+2
0
-2
-4
--6
VIN = 12V
VIN = 40V
Normalized at 25˚C
Normalized to VIN = 10V
VOUT = 5V
ILOAD = 500mA
TJ = 25
VON/OFF = 5V
Switch
Saturation Voltage
SWITCH CURRENT (A)
1.2
-55˚C
1.0
0.8
0.6
0.4
0
0.2
0.4
0.6
0.8
1.0
25˚C
125˚C
150˚C
-40˚C
Dropout Voltage
JUNCTION TEMPERATURE (˚C)
2.0
-75 -50 -25
0 25 50 75 100 125 150
∆VOUT = 5%
RIND = 0.2Ω
ILOAD = 1A
ILOAD = 200 mA
1.5
1.0
0.5
0
Normalized
Output Voltage
JUNCTION TEMPERATURE (˚C)
100
75
50
25
0
-25
-50
-75
-100
-75 -50 -25
0
25 50 75 100 125 150
VIN = 12V
ILOAD = 200mA
Normalized to TJ = 25˚C
1A


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