LM2574YN 查看數據表（PDF） - Micrel
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LM2574YN Datasheet PDF : 8 Pages
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LM2574
Typical Characteristics (Circuit of Figure 1)
Supply Current
20
Measured at
18
Ground Pin
TJ = 25˚C
16
VOUT = 5V
14
12
10
8
ILOADto 0.5A
6
4
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
Current Limit
1.5
V IN = 25V
1
0.5
0
-75 -50 -25 0 25 50 75 100125 150
JUNCTION TEMPERATURE (˚C)
Minimum Operating
Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
VOUT = 1.23V
0.5
ILOAD= 100 mA
0
-75 -50 -25 0 25 50 75 100125150
JUNCTION TEMPERATURE (˚C)
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0
0
Supply Current
vs. Duty Cycle
ILOAD= 100 mA
VIN from 7V to 40V
20 40 60 80 100
DUTY CYCLE (%)
Switch
Saturation Voltage
1.1
0.9
-55˚C
-40˚C
0.7 25˚C
0.5 125˚C
150˚C
0.3
0
0.1 0.2 0.3 0.4 0.5
SWITCH CURRENT (A)
Line Regulation
14
12 Normalized toVIN = 10V
10 VOUT = 5V
8
6
ILO AD = 100mA
TJ = 25
4
2
0
-2
-4
-6
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
Normalized
Output Voltage
100
VIN = 12V
75
ILOAD= 100mA
50
Normalized toTJ = 25˚C
VOUT = 5V
25
0
-25
-50
-75
-100
-75 -50 -25 0 25 50 75 100125150
JUNCTION TEMPERATURE (˚C)
Oscillator Frequency
+8
Normalized at 25˚ C
+6
+4
+2
0
-2
VIN = 40V
-4
--6
VIN = 12V
-8
-75 -50 -25 0 25 50 75 100125150
JUNCTION TEMPERATURE (˚C)
Micrel, Inc.
Standby
Quiescent Current
200
VIN = 40V
150
VON/OFF= 5V
100
VIN = 12V
50
0
-75 -50 -25 0 25 50 75 100 125150
JUNCTION TEMPERATURE (˚C)
Efficiency
100
95
VOUT = 12V
90
0.5A
85 100 mA
80
100 mA
75
0.5A
70
VOUT = 3V
65
60
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Feedback Pin Current
100
75
50
25
0
-25
-50
-75
-100
-75 -50 -25 0 25 50 75 100 125150
JUNCTION TEMPERATURE (˚C)
Dropout Voltage
2.0
∆VOUT = 5%
ILOAD= 0.5A
1.5
RIND = 0.2Ω
1.0
ILOAD= 100 mA
0.5
0
-75 -50 -25 0 25 50 75 100125150
JUNCTION TEMPERATURE (˚C)
July 2005
5
M9999-072805
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