LM2574N-3.3 데이터 시트보기 (PDF) - Motorola => Freescale
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LM2574N-3.3 Datasheet PDF : 24 Pages
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LM2574
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 16) (continued)
Figure 8. Oscillator Frequency
8.0
6.0 Vin = 12 V
4.0 Normalized at 25°C
2.0
0
–2.0
–4.0
–6.0
–8.0
10
–50 –25
0
25
50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Switch Saturation Voltage
1.3
1.2
1.1
1.0
0.9 –40°C
0.8
25°C
0.7
0.6
125°C
0.5
0.4
0.3
0
0.1
0.2
0.3
0.4
0.5
SWITCH CURRENT (A)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–50
Figure 10. Minimum Operating Voltage
Adjustable Version Only
Vin = 1.23 V
ILoad = 100 mA
–25
0
25
50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 11. Feedback Pin Current
100
80
Adjustable Version Only
60
40
20
0
–20
–40
–60
–80
–100
–50 –25
0
25
50
75
100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 12. Continuous Mode Switching Waveforms
Vout = 5.0 V, 500 mA Load Current, L = 330 µH
20 V
Figure 13. Discontinuous Mode Switching Waveforms
Vout = 5.0 V, 100 mA Load Current, L = 100 µH
20 V
A 10 V
A 10 V
0
0
0.6 A
B 0.4 A
0.2 A
0.6 A
B 0.4 A
0.2 A
0
C
20 mV
AC
0
C
20 mV
AC
5 µs/DIV
A: Output Pin Voltage, 10 V/DIV.
B: Inductor Current, 0.2 A/DIV.
C: Output Ripple Voltage, 20 mV/DIV, AC–Coupled
5 µs/DIV
A: Output Pin Voltage, 10 V/DIV.
B: Inductor Current, 0.2 A/DIV.
C: Output Ripple Voltage, 20 mV/DIV, AC–Coupled
6
MOTOROLA ANALOG IC DEVICE DATA
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