CYT1000B Datasheet PDF  JXY
Part Number  CYT1000B  
Description  Linear constant current IC  
Manufacturers  JXY  
Logo  
There is a preview and CYT1000B download ( pdf file ) link at the bottom of this page. Total ( 10 pages ) 
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CYT1000B High PF linear constant current LED IC chip
CYT1000B Specification
Specialty
Summarize
Output current is adjustable
5mA60mA，constant current
CYT1000B is a linear constant current IC, the
precision can reach±3%；
With over temperature
output current is adjustable, high precision of
protection function；
constant current, simple application solutions,
No EMC Question；
Chip and PCB can share cost and resistance capacity of stepdown, over
Aluminum plate；
The circuit is simple,
low
temperature protection function, safer and more
cost；
reliable.
Packaging：T02522；
Pin figure
Application field
Bulb light
Tube light
Downlight
Ceiling light
Pin
OUT
GND
REXT
Typical application solutions
1
Function
Current output port
Chip land
Current regulation port


CYT OptoElectronic Technology Co.,Ltd. CYT1000B
different, will affect the whole of the LED voltage VF
3、 LED Power consumption calculation
The effective value of LED current calculation is as follows：
I LED I F * T / T
The effective value of LED voltage：
（5）
VLED VF * T / T
LED power consumption calculation is as follows：
（6）
PLED VLED * I LED I F *VF * (T / T )
（7）
4、 IC Power consumption calculation
Mains voltage and lamp bead voltage difference is the working voltage of
IC, the expression is as follows:
uIC(t ) u(t ) V(t ) 2Usin(2ft ) V(t )
（8）
IC power consumption is on the integral calculation, as follows：
T2
PIC ( 2Usin(2ft) VF ) * I F dt / T
T1
5、 Power efficiency calculation
（9）
PLED /（PLED PIC P固有损耗）%
（10）
Lines of the inherent loss refers to the switching loss of IC, line loss, the
wastage of the rectifier bridge and other related loss these values cannot be
calculated, but by contrast experiment we can conclude that the depletion
approximation is a fixed value.
At this point, all the theoretical calculation about CYT1000B IC has been
completed, can make the graphical user interface to the above formula, which
can simulate the photovoltaic module in different lamp bead amount, different
feedback resistance, under the condition of different types of lamp bead the
change of the power and power efficiency, reference <CYT1000B application
Tel：075586168222
Website: www.cyt.com.cn
Fax：075586168622
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