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LR2257 Datasheet(PDF) 4 Page - Leshan Radio Company

Part # LR2257
Description  AC/DC Current Mode PWM power management controller
PDF  8 Pages
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Manufacturer  LRC [Leshan Radio Company]
Direct Link  http://www.lrc.cn/
Logo LRC - Leshan Radio Company

LR2257 Datasheet(HTML) 4 Page - Leshan Radio Company

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Electrical Characteristics（
Test condition：TA=25C,VFB＝4V ）
Parameter
Symbol
Test condition
Min
Typ
Max
Unit
Power Supply
VDD
8.5
12
V
FB Start Voltage
Vs
5
V
FB Under-voltage
Threshold
Vu
3.25
3.5
3.65
FB Clamp Voltage
Vo
10mA
5.2
5.5
5.8
V
FB input current
IFB
-
-
0.7
1
mA
Switching Frequency
Fs
-
-
70
-
KHz
Maximum Duty Cycle
DMAX
VFB =4V, ISW=10mA
70
75
80
%
Minimum Duty Cycle
DMIN
VFB=4.6V, ISW=100mA
3.5
5.5
%
Current Limit
ILIM
VFB=VUV+0.1V
-
400
-
mA
FB to SW Current
Gain
GFB
-
-0.29
-
A/V
FB Dynamic
Impedance
RFB/VFB
-
9
-
K
Ω
SW Break Down
Voltage
Vsw
>400
V
Stand By Power
PS
<0.3
W
System Efficiency (Full
Load)
η
74
%
4/8
LESHAN RADIO COMPANY, LTD.
LR2257



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