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LM2576T-12 Scheda tecnica(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM2576T-12
Spiegazioni elettronici  SIMPLE SWITCHER 3A Step-Down Voltage Regulator
Download  24 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2576T-12 Scheda tecnica(HTML) 5 Page - National Semiconductor (TI)

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LM2576-ADJ, LM2576HV-ADJ
Electrical Characteristics
Specifications with standard type face are for T
J = 25˚C, and those with boldface type apply over full Operating Temperature
Range.
Symbol
Parameter
Conditions
LM2576-ADJ
Units
(Limits)
LM2576HV-ADJ
Typ
Limit
(Note 2)
SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2
V
OUT
Feedback Voltage
V
IN = 12V, ILOAD = 0.5A
1.230
V
V
OUT = 5V,
1.217
V(Min)
Circuit of Figure 2
1.243
V(Max)
V
OUT
Feedback Voltage
0.5A
≤ I
LOAD
≤ 3A,
1.230
V
LM2576
8V
≤ V
IN
≤ 40V
1.193/1.180
V(Min)
V
OUT = 5V, Circuit of Figure 2
1.267/1.280
V(Max)
V
OUT
Feedback Voltage
0.5A
≤ I
LOAD
≤ 3A,
1.230
V
LM2576HV
8V
≤ V
IN
≤ 60V
1.193/1.180
V(Min)
V
OUT = 5V, Circuit of Figure 2
1.273/1.286
V(Max)
η
Efficiency
V
IN = 12V, ILOAD = 3A, VOUT =5V
77
%
All Output Voltage Versions
Electrical Characteristics
Specifications with standard type face are for T
J = 25˚C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 12V for the 3.3V, 5V, and Adjustable version, VIN = 25V for the 12V version, and VIN
= 30V for the 15V version. I
LOAD = 500 mA.
Symbol
Parameter
Conditions
LM2576-XX
Units
(Limits)
LM2576HV-XX
Typ
Limit
(Note 2)
DEVICE PARAMETERS
I
b
Feedback Bias Current
V
OUT = 5V (Adjustable Version Only)
50
100/500
nA
f
O
Oscillator Frequency
(Note 11)
52
kHz
47/42
kHz
(Min)
58/63
kHz
(Max)
V
SAT
Saturation Voltage
I
OUT = 3A (Note 4)
1.4
V
1.8/2.0
V(Max)
DC
Max Duty Cycle (ON)
(Note 5)
98
%
93
%(Min)
I
CL
Current Limit
(Notes 4, 11)
5.8
A
4.2/3.5
A(Min)
6.9/7.5
A(Max)
I
L
Output Leakage Current
(Notes 6, 7):
Output = 0V
2
mA(Max)
Output = −1V
7.5
mA
Output = −1V
30
mA(Max)
I
Q
Quiescent Current
(Note 6)
5
mA
10
mA(Max)
I
STBY
Standby Quiescent
ON /OFF Pin = 5V (OFF)
50
µA
Current
200
µA(Max)
www.national.com
5


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