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LM2577T-12 Fiches technique(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM2577T-12
Description  SIMPLE SWITCHER Step-Up Voltage Regulator
Download  27 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2577T-12 Fiches technique(HTML) 3 Page - National Semiconductor (TI)

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Electrical Characteristics — LM1577-12, LM2577-12 (Continued)
Specifications with standard type face are for T
J = 25˚C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 5V, and ISWITCH = 0.
LM1577-12
LM2577-12
Units
Symbol
Parameter
Conditions
Typical
Limit
Limit
(Limits)
(Notes 3, 4)
(Note 5)
DEVICE PARAMETERS
Error Amplifier
Upper Limit
2.4
V
Output Swing
V
FEEDBACK = 10.0V
2.2/2.0
2.2/2.0
V(min)
Lower Limit
0.3
V
V
FEEDBACK = 15.0V
0.40/0.55
0.40/0.55
V(max)
Error Amplifier
V
FEEDBACK = 10.0V to 15.0V
±200
µA
Output Current
V
COMP = 1.0V
±130/±90
±130/±90
µA(min)
±300/±400
±300/±400
µA(max)
I
SS
Soft Start Current
V
FEEDBACK = 10.0V
5.0
µA
V
COMP = 0V
2.5/1.5
2.5/1.5
µA(min)
7.5/9.5
7.5/9.5
µA(max)
D
Maximum Duty Cycle
V
COMP = 1.5V
95
%
I
SWITCH = 100 mA
93/90
93/90
%(min)
Switch
Transconductance
12.5
A/V
I
L
Switch Leakage
V
SWITCH = 65V
10
µA
Current
V
FEEDBACK = 15V (Switch Off)
300/600
300/600
µA(max)
V
SAT
Switch Saturation
I
SWITCH = 2.0A
0.5
V
Voltage
V
COMP = 2.0V (Max Duty Cycle)
0.7/0.9
0.7/0.9
V(max)
NPN Switch
4.5
A
Current Limit
3.7/3.0
3.7/3.0
A(min)
5.3/6.0
5.3/6.0
A(max)
Electrical Characteristics — LM1577-15, LM2577-15
Specifications with standard type face are for T
J = 25˚C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 5V, and ISWITCH = 0.
LM1577-15
LM2577-15
Units
Symbol
Parameter
Conditions
Typical
Limit
Limit
(Limits)
(Notes 3, 4)
(Note 5)
SYSTEM PARAMETERS Circuit of
Figure 2 (Note 6)
V
OUT
Output Voltage
V
IN = 5V to 12V
15.0
V
I
LOAD = 100 mA to 600 mA
14.50/14.25
14.50/14.25
V(min)
(Note 3)
15.50/15.75
15.50/15.75
V(max)
Line Regulation
V
IN = 3.5V to 12V
20
50/100
50/100
mV
I
LOAD = 300 mA
mV(max)
Load Regulation
V
IN = 5V
20
50/100
50/100
mV
I
LOAD = 100 mA to 600 mA
mV(max)
η
Efficiency
V
IN = 5V, ILOAD = 600 mA
80
%
DEVICE PARAMETERS
I
S
Input Supply Current
V
FEEDBACK = 18.0V
7.5
mA
(Switch Off)
10.0/14.0
10.0/14.0
mA(max)
I
SWITCH = 2.0A
25
mA
V
COMP = 2.0V
50/85
50/85
mA(max)
(Max Duty Cycle)
V
UV
Input Supply
I
SWITCH = 100 mA
2.90
V
www.national.com
3


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