Series:Control System

  Product Description

  TP8301 is a high power factor primary feedback flyback type LED constant current driver chip.The chip integrates a single stage active power factor correction circuit,which is particularly suitable for high-performance isolated LED lighting systems with a full voltage input range of 85VAC to 265VAC.

  TP8301 integrates a single-stage active power factor correction circuit,which can achieve high power factor and low input current Total harmonic distortion.TP8301 operates in quasi resonant switching mode,with the power transistor conducting at zero current.This has

  Effectively reducing the switching loss of the power transistor,improving system efficiency,and also improving the EMI characteristics of the system.

  TP8301 adopts the control method of primary feedback,which can achieve high-precision LED constant current output through the information of primary feedback,without the need for optocouplers,secondary feedback circuits,etc.This saves the cost and volume of the system and simplifies the LED lighting system

  Design.TP8301 integrates line voltage and load compensation functions,and the system has excellent line voltage regulation and load regulation rates.

  TP8301 has a wide working voltage range and is suitable for AC input in the full voltage range of 85VAC to 265VAC.At the same time,TP8301 integrates multiple protection functions to ensure the stability and reliability of the system.Including VCC power supply overvoltage protection,VCC power supply undervoltage protection,LED open circuit and short circuit protection,chip over temperature protection,and transformer primary winding cycle by cycle current limiting.

  Highlights

  Port setting single stage active PFC function

  Low Total harmonic distortion of port input current

  Primary feedback constant current control without the need for secondary feedback wires

  Quasi harmonic vibration switch mode with minimal damage to the switch

  +3%LED output current concentration

  ]Excellent line voltage regulation rate and load regulation rate

  Port ultra-low starting current

  Port LED output path protection

  Port LED output short circuit protection

  VCC provides voltage protection

  VCC provides voltage protection

  Cycle by cycle current limiting of mouth CS

  Automatic restart function of port

  Port chip over temperature protection

  The mouth adopts SOT23-6L packaging

  Application Description

  TP8301 is a high power factor primary feedback flyback LED constant current driving chip.The chip integrates a single-stage active power factor calibration circuit,which can achieve a large amount of power factor and a small amount of Total harmonic distortion of input current,and is particularly suitable for the application of performance isolated LED lighting system in the full voltage input range of 8SVAC~265VAC.TP8301 operates in the mode of primary feedback and quasi resonant switching,achieving LED constant current output and simple power tube switching.

  Startup process

  After the system is powered on,the bus voltage charges the VCC capacitor through the starting resistor.When the VCC reaches the opening threshold of the voltage chip,the control circuit inside TP8301 begins to work.At this point,the chip first pre charges the RC network of COMP,and the COMP voltage quickly rises to 1.55V.After the pre charging of COMP is completed,the power transistor begins to switch.At this time,the LED output voltage starts to rise from zero,and the COMP voltage also rises.After the LED output voltage is established,the auxiliary winding of the transformer begins to supply power to the VCC,and the chip startup is completed.Pre charging time of COMP can be adjusted through R COMP,and larger R COMP can obtain larger loop Phase margin.