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LR2257 PDF预览

LR2257

更新时间: 2024-10-19 12:01:31
品牌 Logo 应用领域
乐山 - LRC 控制器
页数 文件大小 规格书
8页 408K
描述
AC/DC Current Mode PWM power management controller

LR2257 数据手册

 浏览型号LR2257的Datasheet PDF文件第2页浏览型号LR2257的Datasheet PDF文件第3页浏览型号LR2257的Datasheet PDF文件第4页浏览型号LR2257的Datasheet PDF文件第5页浏览型号LR2257的Datasheet PDF文件第6页浏览型号LR2257的Datasheet PDF文件第7页 
LESHAN RADIO COMPANY, LTD.  
LR2257 AC/DC Current Mode PWM  
power management controller  
The LR2257 AC—DC is a high  
efficiency current-mode PWM power  
supply controller that drives an internal  
NPN transistor for high voltage switching.  
Apply with BiCMOS technology, the  
device consist of Bandgap reference  
voltage, Oscillator, High voltage switching  
transistor and build in safety features of  
over current and over voltage protection  
mechanisms  
¾
¾
Lowest Total Cost Solution  
Low Power for Green Environments  
Protection, as lower as 0.3W  
¾
¾
Current Mode PWM  
Over-Current Protection, Over and  
Under-voltage Protection  
¾
¾
Emitter Drive of Internal Power Transistor  
65kHz Switching Frequency  
Delivering up to 3W yet consumes, the  
typical application of the device will  
include:  
z
z
z
z
Battery Charger, such as handset phone  
Power Adapter  
Offline Power Generator  
Etc.  
Absolute Maxim Ratings  
Item  
Symbol  
VDD  
Vs  
Typical  
912  
5
Unit  
V
Power Supply  
FB Start Voltage  
V
FB Under-voltage Threshold  
Vu  
Vo  
3.5  
5.5  
V
V
FB Clamp Voltage  
FB input current  
IFB  
<1  
mA  
KHz  
Switching Frequency  
Maximum Duty Cycle  
FBSW Current Gain  
Current Limit  
Fs  
65  
DMAX  
GF  
75  
0.3  
A/V  
mA  
V
ILIM  
Vsw  
PS  
400  
>400  
<0.3W  
>70  
SW Break Down Voltage  
Stand By Current  
W
System Efficiency (Full Load)  
η
%
1/8  

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