參數(shù)資料
型號： LM2577M-12/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PDSO24
封裝： 0.300 INCH, SO-24
文件頁數(shù)： 30/31頁
文件大小： 1406K
代理商： LM2577M-12/NOPB
Electrical Characteristics—LM1577-ADJ, LM2577-ADJ (Continued)
Specifications with standard type face are for T
J = 25C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 5V, VFEEDBACK =VREF, and ISWITCH =0.
LM1577-ADJ LM2577-ADJ
Units
Symbol
Parameter
Conditions
Typical
Limit
(Limits)
(Notes 3, 4)
DEVICE PARAMETERS
Error Amplifier
Upper Limit
2.4
V
Output Swing
V
FEEDBACK = 1.0V
2.2/2.0
V(min)
Lower Limit
0.3
V
FEEDBACK = 1.5V
0.40/0.55
V(max)
Error Amp
V
FEEDBACK = 1.0V to 1.5V
±200
A
Output Current
V
COMP = 1.0V
±130/±90
A(min)
±300/±400
A(max)
I
SS
Soft Start Current
V
FEEDBACK = 1.0V
5.0
A
V
COMP = 0V
2.5/1.5
A(min)
7.5/9.5
A(max)
D
Maximum Duty Cycle
V
COMP = 1.5V
95
%
I
SWITCH = 100 mA
93/90
%(min)
I
SWITCH/
Switch
12.5
A/V
V
COMP
Transconductance
I
L
Switch Leakage
V
SWITCH = 65V
10
A
Current
V
FEEDBACK = 1.5V (Switch Off)
300/600
A(max)
V
SAT
Switch Saturation
I
SWITCH = 2.0A
0.5
V
Voltage
V
COMP = 2.0V (Max Duty Cycle)
0.7/0.9
V(max)
NPN Switch
V
COMP = 2.0V
4.3
A
Current Limit
3.7/3.0
A(min)
5.3/6.0
A(max)
THERMAL PARAMETERS (All Versions)
θ
JA
Thermal Resistance
K Package, Junction to Ambient
35
C/W
θ
JC
K Package, Junction to Case
1.5
θ
JA
T Package, Junction to Ambient
65
θ
JC
T Package, Junction to Case
2
θ
JA
N Package, Junction to
85
Ambient (Note 8)
θ
JA
M Package, Junction
100
to Ambient (Note 8)
θ
JA
S Package, Junction to
37
Ambient (Note 9)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended to
be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the
Electrical Characteristics.
Note 2: Due to timing considerations of the LM1577/LM2577 current limit circuit, output current cannot be internally limited when the LM1577/LM2577 is used as
a step-up regulator. To prevent damage to the switch, its current must be externally limited to 6.0A. However, output current is internally limited when the
LM1577/LM2577 is used as a flyback or forward converter regulator in accordance to the Application Hints.
Note 3: All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All limits are used to calculate Outgoing Quality
Level, and are 100% production tested.
Note 4: A military RETS electrical test specification is available on request. At the time of printing, the LM1577K-12/883, LM1577K-15/883, and LM1577K-ADJ/883
RETS specifications complied fully with the boldface limits in these columns. The LM1577K-12/883, LM1577K-15/883, and LM1577K-ADJ/883 may also be procured
to Standard Military Drawing specifications.
Note 5: All limits guaranteed at room temperature (standard type face) and at temperature extremes (boldface type). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Note 6: External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM1577/LM2577 is
used as shown in the Test Circuit, system performance will be as specified by the system parameters.
Note 7: A 1.0 M
resistor is connected to the compensation pin (which is the error amplifier’s output) to ensure accuracy in measuring AVOL. In actual applications,
this pin’s load resistance should be
≥10 M, resulting in AVOL that is typically twice the guaranteed minimum limit.
LM1577/LM2577
www.national.com
8
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LM2577NADJ 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PDIP24
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相關代理商/技術參數(shù)
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