CYT1000AE Datasheet PDF - JXY
Part Number | CYT1000AE | |
Description | Linear constant current IC | |
Manufacturers | JXY | |
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CYT1000AE 线性恒流 LED 芯片
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![]() ![]() CYT1000A 理论计算
CYT1000AE 线性恒流 LED 芯片
VF/IF
T1 T2
1、 市电的波形函数是一个正弦曲线(如图 2),表达是如下:
u 2U sin(2ft )
(1)
其中:U:市电有效值,f:市电频率,φ:初始相位
式 1 的逆运算可以求出
T1 arcsin(VF / 2U ) / 2f
T2 1/ 2 f arcsin(VF / 2U ) / 2f
由此可以求出 LED 电流导通时间
(2)
T T 2 T1
(3)
2、 灯珠的 V-I 特性曲线:
由式(2)可以看出灯珠的电压 VF 影响 LED 的导通时间,进而影响 LED 的有
效电流,如下:
VF n *VLED (I LED 600mV / R)
(4)
电阻 R 不同,流经 LED 的电流就不同,所呈现的 VF 就不一样,进而影响 LED
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