參數(shù)資料
型號： LM2574
廠商： ON SEMICONDUCTOR
英文描述： 0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator(0.5A,可調(diào)輸出電壓,降壓型開關(guān)穩(wěn)壓器)
中文描述： 0.5甲，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器（0.5A的，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器）
文件頁數(shù)： 3/26頁
文件大?。?/td> 295K
代理商： LM2574
LM2574, NCV2574
http://onsemi.com
3
OPERATING RATINGS
(Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee
specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics).
Rating
Symbol
Value
Unit
Operating Junction Temperature Range
T
J
40 to +125
°
C
Supply Voltage
V
in
40
V
SYSTEM PARAMETERS
([Note 1] Test Circuit Figure 16)
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, V
in
= 12 V for the 3.3 V, 5.0 V, and Adjustable
version, V
in
= 25 V for the 12 V version, V
in
= 30 V for the 15 V version. I
Load
= 100 mA. For typical values T
J
= 25
°
C, for min/max values
T
J
is the operating junction temperature range that applies [Note 2], unless otherwise noted).
Characteristic
Symbol
Min
Typ
Max
Unit
LM25743.3
([Note 1] Test Circuit
Figure 16)
Output Voltage (V
in
= 12 V, I
Load
= 100 mA, T
J
= 25
°
C)
V
out
3.234
3.3
3.366
V
Output Voltage (4.75 V
≤
V
in
≤
40 V, 0.1 A
≤
I
Load
≤
0.5 A)
T
J
= 25
°
C
T
J
= 40 to +125
°
C
Efficiency (V
in
= 12 V, I
Load
= 0.5 A)
V
out
V
3.168
3.135
3.3
3.432
3.465
η
72
%
LM25745
([Note 1] Test Circuit Figure 16)
Output Voltage (V
in
= 12 V, I
Load
= 100 mA, T
J
= 25
°
C)
V
out
4.9
5.0
5.1
V
Output Voltage (7.0 V
≤
V
in
≤
40 V, 0.1 A
≤
I
Load
≤
0.5 A)
T
J
= 25
°
C
T
J
= 40 to +125
°
C
V
out
V
4.8
4.75
5.0
5.2
5.25
Efficiency (V
in
= 12 V, I
Load
= 0.5 A)
η
77
%
LM257412
([Note 1] Test Circuit Figure 16)
Output Voltage (V
in
= 25 V, I
Load
= 100 mA, T
J
= 25
°
C)
V
out
11.76
10
12.24
V
Output Voltage (15 V
≤
V
in
≤
40 V, 0.1 A
≤
I
Load
≤
0.5 A)
T
J
= 25
°
C
T
J
= 40 to +125
°
C
V
out
V
11.52
11.4
12
12.48
12.6
Efficiency (V
in
= 15 V, I
Load
= 0.5 A)
η
88
%
LM257415
([Note 1] Test Circuit Figure 16)
Output Voltage (V
in
= 30 V, I
Load
= 100 mA, T
J
= 25
°
C)
V
out
14.7
15
15.3
V
Output Voltage (18 V < V
in
< 40 V, 0.1 A < I
Load
< 0.5 A)
T
J
= 25
°
C
T
J
= 40 to +125
°
C
Efficiency (V
in
= 18 V, I
Load
= 0.5 A)
V
out
V
14.4
14.25
15
15.6
15.75
η
88
%
LM2574 ADJUSTABLE VERSION
([Note 1] Test Circuit
Figure 16)
Feedback Voltage V
in
= 12 V, I
Load
= 100 mA, V
out
= 5.0 V, T
J
= 25
°
C
V
FB
1.217
1.23
1.243
V
Feedback Voltage 7.0 V
≤
V
in
≤
40 V, 0.1 A
≤
I
Load
≤
0.5 A, V
out
= 5.0
V
T
J
= 25
°
C
T
J
= 40 to +125
°
C
Efficiency (V
in
= 12 V, I
Load
= 0.5 A, V
out
= 5.0 V)
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, NCV2574: T
low
= 40
°
C T
high
= +125
°
C.
V
FBT
V
1.193
1.18
1.23
1.267
1.28
η
77
%
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