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LM2574M-12 bảng dữ liệu(PDF) 5 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
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LM2574M-12 bảng dữ liệu(HTML) 5 Page - Texas Instruments

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LM2574, LM2574HV
www.ti.com
SNVS104D – JUNE 1999 – REVISED APRIL 2016
Product Folder Links: LM2574 LM2574HV
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
(1)
All limits specified at room temperature TYP and MAX. All room temperature limits are 100% production tested. All limits at temperature
extremes are specified through correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate
Average Outgoing Quality Level.
(2)
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% (see Figure 6).
(3)
Output pin sourcing current. No diode, inductor or capacitor connected to output pin.
(4)
Feedback pin removed from output and connected to 0 V.
(5)
Feedback pin removed from output and connected to 12 V for the adjustable, 3.3-V, and 5-V versions, and 25 V for the 12-V and 15-V
versions, to force the output transistor OFF.
(6)
VIN = 40 V (60 V for high voltage version).
6.5 Electrical Characteristics for All Output Voltage Versions
TJ = 25°C, and MIN and MAX apply over full operating temperature range. VIN = 12 V for the 3.3-V, 5-V, and adjustable
version, VIN = 25 V for the 12-V version, and VIN = 30 V for the 15-V version, ILOAD = 100 mA (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN(1)
TYP
MAX(1)
UNIT
Ib
Feedback bias current
Adjustable version
only, VOUT = 5 V
TJ = 25°C
50
100
nA
–40°C < TJ < 125°C
500
fO
Oscillator frequency
See(2)
TJ = 25°C
47
52
58
kHz
–40°C < TJ < 125°C
42
63
VSAT
Saturation voltage
IOUT = 0.5 A
(3)
TJ = 25°C
0.9
1.2
V
–40°C < TJ < 125°C
1.4
DC
Maximum duty cycle (ON)
See(4)
93%
98%
ICL
Current limit
Peak current(3)(2)
0.7
1
1.6
A
0.65
1.8
IL
Current output leakage
Output = 0 V
2
mA
Output = –1 V(5)(6)
7.5
30
IQ
Quiescent current
See(5)
5
10
mA
ISTBY
Standby quiescent current
ON/OFF pin = 5 V (OFF)
50
200
μA
ON/OFF CONTROL (SEE Figure 27)
VIH
ON/OFF pin logic input level
VOUT = 0 V
TJ = 25°C
2.2
1.4
V
–40°C < TJ < 125°C
2.4
VIL
VOUT = Nominal output
voltage
TJ = 25°C
1.2
1
V
–40°C < TJ < 125°C
0.8
IH
ON/OFF pin input current
ON/OFF pin = 5 V (OFF)
12
30
μA
IIL
ON/OFF pin = 0 V (ON)
0
10
μA
(1)
Test Circuit in Figure 22 and Figure 27.
(2)
All limits specified at room temperature and at temperature extremes . All room temperature limits are 100% production tested. All limits
at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to
calculate Average Outgoing Quality Level.
6.6 Electrical Characteristics – 3.3-V Version
TJ = 25°C, and all MIN and MAX apply over full operating temperature range (unless otherwise noted).
PARAMETER(1)
TEST CONDITIONS
MIN(2)
TYP
MAX(2)
UNIT
VOUT
Output voltage
VIN = 12 V, ILOAD = 100 mA
3.234
3.3
3.366
V
LM2574, 4.75 V
≤ VIN ≤ 40 V,
0.1 A
≤ ILOAD ≤ 0.5 A
TJ = 25°C
3.168
3.3
3.432
−40°C ≤ TJ ≤ 125°C
3.135
3.465
LM2574HV, 4.75 V
≤ VIN ≤ 60 V,
0.1 A
≤ ILOAD ≤ 0.5 A
TJ = 25°C
3.168
3.3
3.45
−40°C ≤ TJ ≤ 125°C
3.135
3.482
η
Efficiency
VIN = 12 V, ILOAD = 0.5 A
72%


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