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LM2574N bảng dữ liệu(PDF) 6 Page - ON Semiconductor

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Giải thích chi tiết về linh kiện  0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
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LM2574
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6
A
B
C
5 µs/DIV
TJ, JUNCTION TEMPERATURE (°C)
SWITCH CURRENT (A)
5 µs/DIV
TJ, JUNCTION TEMPERATURE (°C)
Figure 8. Oscillator Frequency
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Switch Saturation Voltage
Figure 10. Minimum Operating Voltage
Figure 11. Feedback Pin Current
Figure 12. Continuous Mode Switching Waveforms
Vout = 5.0 V, 500 mA Load Current, L = 330 µH
Figure 13. Discontinuous Mode Switching Waveforms
Vout = 5.0 V, 100 mA Load Current, L = 100 µH
Vin = 1.23 V
ILoad = 100 mA
Adjustable Version Only
Vin = 12 V
Normalized at 25°C
Adjustable Version Only
A
B
C
A: Output Pin Voltage, 10 V/DIV.
B: Inductor Current, 0.2 A/DIV.
C: Output Ripple Voltage, 20 mV/DIV, AC–Coupled
A: Output Pin Voltage, 10 V/DIV.
B: Inductor Current, 0.2 A/DIV.
C: Output Ripple Voltage, 20 mV/DIV, AC–Coupled
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 16) (continued)
8.0
6.0
4.0
2.0
0
-2.0
-4.0
-6.0
-8.0
10
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
80
60
40
20
0
-20
-40
-60
-80
-100
125
100
75
50
25
0
-25
-50
0
0.1
0.2
0.3
0.4
0.5
125
100
75
50
25
0
-25
-50
125
100
75
50
25
0
-25
-50
20 V
10 V
0
0.6 A
0.4 A
0.2 A
0
20 mV
AC
20 V
10 V
0
0.6 A
0.4 A
0.2 A
0
20 mV
AC
-40°C
25°C
125°C


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