CYT3000CSpecification

The product description

CYT3000C is a high power factor linear constant current driver on high voltage LED chips, used in LED lighting field.The IC CYT3000B through a unique patented technology, constant current control to realize constant current precision is less than ±5%, the output current can be regulated by the external R1 resistance. The IC CYT3000B with high power factor and low harmonic distortion.

CYT3000C have the function of the output current with the temperature automatic adjustment. When the temperature is too high, it will reduce the output current, in order to achieve the effect of lowering the temperature, temperature protection point can set through the pin RTH’s external resistance.

CYT3000C has the function of the input power automatic adjustment when the input voltage is too high, it will reduce the output current, reduce the magnitude of the current through the external resistors RD Settings, to ensure the input power does not change with the input voltage
   Simple system structure , the IC CYT3000B has a variety of protection function without transformer and electrolytic capacitor, the IC CYT3000B use few peripheral components, can save the space of electronic components, which can  realize all SMT processing and full automatic operation.

Features

 With no transformer and electrolytic capacitors

  Integrated high voltage power supply

 Output current can be adjusted, the maximum of 60mA

 Current deviation＜±5%

  Efficiency：＞80%

 PF＞0.95

 THD:＜20%

  With overheating protection function

 Applications without EMI problems

  ESOP8 packaging format

Application

  T5 / T8 series LED tube

  LED bulb light

 LED downlight

  LED ceiling light

Pin figure

picture 1 3000C Model Application Solutions

Pin Definition

Absolute Maximum Rating

Electrical characteristics

Current Settings

    CYT3000C is LED constant current drive control circuit, integrated multi-functions module such as LED constant current control module, the OUT port driver module and so on. The IC CYT3000B D1 port minimum input voltage is 6 v (IOUT = 20 ma), can be achieved through external REXT resistance output current from 10mA～60mA, built-in LED constant current driver module can make the LED current in high precision and is not affected by environmental temperature. IC CYT3000C can be realized through step by step to open four switch high efficiency, high power factor.
    CYT3000C output current adjusted by RT resistance, 4 level switch opens output current step by step as follows:
 ID1=0.65V/RT       ID2=0.72V/RT       ID3=0.80V/RT      ID4=0.90V/RT

Automatic temperature adjustment function

CYT3000C output current with the temperature automatic adjustment function.When the temperature is too high, the system will reduce the output current, inorder to achieve the effect of lowering the temperature,

Temperature protection points can set by pin RTH’s external resistor, the RTH voltage will be 1.0 V. The smaller the resistance, the lower the temperature

protection point.

If the RTH feet up, then the point temperature protection for the default

value is 139 degrees Celsius.

The input power automatic adjustment function

CYT3000C has the function of the input power automatic adjustment by monitoring the D4’s voltage VD4, when the input voltage is too high, VD4 increases, the internal logic control VR4 R side voltage is reduced, thus reducing the output current, reduce the magnitude of the current through the external resistors R2 Setting, adjust the formula is as follows:

VR4=0.9-(1.6K/RD)*VD4

Application solutions

  CYT3000B Typical application solutions

picture 2. 3000B Model Application Solutions

CYT3000B Parallel scheme

Picture3.CYT3000A Parallel scheme

    Reference design－PCB design

PCB Picture

   Reference design - 9W Module BOM

   Order Information

Package Type

ESOP8