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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)： | 4/24頁 |
| 文件大?。?/td> | 397K |
| 代理商： | LM2574 |
LM2574
4
MOTOROLA ANALOG IC DEVICE DATA
SYSTEM PARAMETERS
([Note 1] Test Circuit Figure 16)
ELECTRICAL CHARACTERISTICS
(continued)
(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version,
Vin = 25 V for the 12 V version, Vin = 30 V for the 15 V version. ILoad = 100 mA. For typical values TJ = 25
°
C, for min/max values TJ is the
operating junction temperature range that applies [Note 2], unless otherwise noted).
Characteristic
Unit
Max
Typ
Min
Symbol
ALL OUTPUT VOLTAGE VERSIONS
Feedback Bias Current Vout = 5.0 V (Adjustable Version Only)
TJ = 25
°
C
TJ = –40 to +125
°
C
Oscillator Frequency (Note 3)
TJ = 25
°
C
TJ = 0 to +125
°
C
TJ = –40 to +125
°
C
Saturation Voltage (Iout = 0.5 A, [Note 4])
TJ = 25
°
C
TJ = –40 to +125
°
C
Max Duty Cycle (“on”) [Note 5]
Ib
nA
–
–
25
–
100
200
fO
kHz
–
47
42
52
52
–
–
58
63
Vsat
V
–
–
1.0
–
1.2
1.4
DC
93
98
–
%
Current Limit Peak Current (Notes 3 and 4)
TJ = 25
°
C
TJ = –40 to +125
°
C
Output Leakage Current (Notes 6 and 7), TJ = 25
°
C
Output = 0 V
Output = – 1.0 V
ICL
A
0.7
0.65
1.0
–
1.6
1.8
IL
mA
–
–
0.6
10
2.0
30
Quiescent Current (Note 6)
TJ = 25
°
C
TJ = –40 to +125
°
C
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
TJ = 25
°
C
TJ = –40 to +125
°
C
ON/OFF Pin Logic Input Level
Vout = 0 V
TJ = 25
°
C
TJ = –40 to +125
°
C
Nominal Output Voltage
TJ = 25
°
C
TJ = –40 to +125
°
C
ON/OFF Pin Input Current
ON/OFF Pin = 5.0 V (“off”), TJ = 25
°
C
ON/OFF Pin = 0 V (“on”), TJ = 25
°
C
IQ
mA
–
–
5.0
–
9.0
11
Istby
μ
A
–
–
60
–
200
400
V
VIH
2.2
2.4
1.4
–
–
–
VIL
–
–
1.2
–
1.0
0.8
μ
A
IIH
IIL
–
–
15
0
30
5.0
NOTES:
1.External components such as the catch diode, inductor, input and output capacitors can affect the switching regulator system
performance. When the LM2574 is used as shown in the Figure 16 test circuit, the system performance will be as
shown in the system parameters section of the Electrical Characteristics.
2.Tested junction temperature range for the LM2574: Tlow = –40
°
C Thigh = +125
°
C
3.The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output
voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of
the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
4.Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to the output pin.
5.Feedback (Pin 4) removed from output and connected to 0 V.
6.Feedback (Pin 4) removed from output and connected to 12 V for the Adjustable, 3.3 V, and 5.0 V versions, and 25 V for the 12 V and 15 V
versions, to force the output transistor OFF.
7.Vin = 40 V.
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