LM2576BU 데이터 시트보기 (PDF) - Micrel
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LM2576BU Datasheet PDF : 8 Pages
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LM2576
Typical Performance Characteristics (continued) (Circuit of Figure 1)
Micrel
Supply Current
20
Measured at
18
Ground Pin
TJ = 25˚C
16
VOUT = 5V
14
12
10
8
ILOAD to 1A
6
4
0 10 20 30 40 50 60
INPUT VOLTAGE (V)
Supply Current
vs. Duty Cycle
20.0
17.5
15.0
12.5
10.0
7.5
ILOAD = 200 mA
5.0
2.5
VIN from 7V to 40V
0
0 20 40 60 80 100
DUTY CYCLE (%)
Standby
Quiescent Current
200
VIN = 40V
150
VON/OFF = 5V
100
VIN = 12V
50
0
-75 -50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (˚C)
Current Limit
Switch
Saturation Voltage
Efficiency
6.5
1.5
VIN = 12V
1.4
6.0
1.2
-55˚C
5.5
1.0
0.8
5.0
25˚C
0.6
150˚C
0.4
4.5
0.2
100
95
VOUT = 12V
1A
90
85
80
200 mA
75
200 mA
3A
70 1A
65 3A
VOUT = 3V
4
4.0
-75 -50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (˚C)
0
0 0.5 1.0 1.5 2.0 2.5 3.0
SWITCH CURRENT (A)
60
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Minimum Operating
Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-75 -50 -25 0
VOUT = 1.23V
ILOAD = 200 mA
25 50 75 100 125 150
JUNCTION TEMPERATURE (˚C)
Line Regulation
14
12 Normalized to VIN = 10V
10 VOUT = 5V
8
6
ILOAD = 500mA
TJ = 25
4
2
0
-2
-4
-6
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
Feedback Pin Current
100
75
50
25
0
-25
-50
-75
-100
-75 -50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (˚C)
Normalized
Output Voltage
100
VIN = 12V
75
ILOAD = 200mA
50
Normalized to TJ = 25˚C
25
0
-25
-50
-75
-100
-75 -50 -25 0 25 50 75 100 125 150
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 75 100 125 150
JUNCTION TEMPERATURE (˚C)
Dropout Voltage
2.0
ILOAD = 3A
L1 = 330 µH
1.5
ILOAD = 1A
1.0
0.5
ILOAD = 200 mA
0
-75 -50 -25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (˚C)
October 1998
4-125
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