參數(shù)資料
型號(hào)： LM2577S-12X
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, PSSO5
封裝： PLASTIC, TO-263, SMT-5
文件頁數(shù)： 29/31頁
文件大?。?/td> 1406K
代理商： LM2577S-12X
Electrical Characteristics—LM1577-15, LM2577-15 (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, and ISWITCH =0.
LM1577-15
LM2577-15
Units
Symbol
Parameter
Conditions
Typical
Limit
(Limits)
(Notes 3, 4)
DEVICE PARAMETERS
NPN Switch
V
COMP = 2.0V
4.3
A
Current Limit
3.7/3.0
A(min)
5.3/6.0
A(max)
Electrical Characteristics—LM1577-ADJ, LM2577-ADJ
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)
SYSTEM PARAMETERS Circuit of Figure 3 (Note 6)
V
OUT
Output Voltage
V
IN = 5V to 10V
12.0
V
I
LOAD = 100 mA to 800 mA
11.60/11.40
V(min)
12.40/12.60
V(max)
V
OUT/
Line Regulation
V
IN = 3.5V to 10V
20
mV
V
IN
I
LOAD = 300 mA
50/100
mV(max)
V
OUT/
Load Regulation
V
IN =5V
20
mV
I
LOAD
I
LOAD = 100 mA to 800 mA
50/100
mV(max)
η
Efficiency
V
IN = 5V, ILOAD = 800 mA
80
%
DEVICE PARAMETERS
I
S
Input Supply Current
V
FEEDBACK = 1.5V (Switch Off)
7.5
mA
10.0/14.0
mA(max)
I
SWITCH = 2.0A
25
mA
V
COMP = 2.0V (Max Duty Cycle)
50/85
mA(max)
V
UV
Input Supply
I
SWITCH = 100 mA
2.90
V
Undervoltage Lockout
2.70/2.65
V(min)
3.10/3.15
V(max)
f
O
Oscillator Frequency
Measured at Switch Pin
52
kHz
I
SWITCH = 100 mA
48/42
kHz(min)
56/62
kHz(max)
V
REF
Reference
Measured at Feedback Pin
V
Voltage
V
IN = 3.5V to 40V
1.230
1.214/1.206
V(min)
V
COMP = 1.0V
1.246/1.254
V(max)
V
REF/
Reference Voltage
V
IN = 3.5V to 40V
0.5
mV
V
IN
Line Regulation
I
B
Error Amp
V
COMP = 1.0V
100
nA
Input Bias Current
300/800
nA(max)
G
M
Error Amp
I
COMP = 30 A to +30 A
3700
mho
Transconductance
V
COMP = 1.0V
2400/1600
mho(min)
4800/5800
mho(max)
A
VOL
Error Amp
V
COMP = 1.1V to 1.9V
800
V/V
Voltage Gain
R
COMP = 1.0 M
500/250
V/V(min)
LM1577/LM2577
www.national.com
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