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參數(shù)資料
| 型號： | LM2574 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
| 中文描述： | ⑩0.5A的的SIMPLE SWITCHER降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 397K |
| 代理商： | LM2574 |
LM2574
6
MOTOROLA ANALOG IC DEVICE DATA
,
Vi
Vs
IF
A
B
C
5
μ
s/DIV
TJ, JUNCTION TEMPERATURE (
°
C)
SWITCH CURRENT (A)
5
μ
s/DIV
TJ, JUNCTION TEMPERATURE (
°
C)
N
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
μ
H
20 V
Figure 13. Discontinuous Mode Switching Waveforms
Vout = 5.0 V, 100 mA Load Current, L = 100
μ
H
20 V
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
–50
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
125
100
75
50
25
0
–25
–50
10 V
0
0.6 A
0.4 A
0.2 A
0
20 mV
AC
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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