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The MT7855BLS is a high-PF, non-isolate LED Driver IC. The floating-ground, high-side BUCK topology makes full wave detection possible. High precision output current is achieved. MT7855BLS works in Quasi-Resonant Mode (QRM), which improves both of efficiency and EMI performance. 
The system integrates the ultra-high voltage power supply circuit, the start-up resistor and power supply diode are not needed. MT7855BLS also integrates compensation circuit, which eliminates COMP pin and COMP capacitor. MT7855BLS can meet low THD requirements through internal THD compensation circuit.
Various protections such as over voltage protection (OVP), over current protection (OCP) and over temperature compensation, etc. are embedded to improve reliability. The MT7855BLS integrates 500V MOSFET, which further simplifies external circuit.



  • Single-stage active power factor correction (PF>0.90)
  • Ultra-high voltage power supply without start-up resistor and power supply diode
  • Built-in compensation circuit, no COMP capacitor is needed
  • Integrate THD compensation circuit, THD<15%
  • High subharmonic-Distortion-Suppression
  • High accurate LED current (±3%) 
  • Good Line and Load Regulation (±2%) 
  • Quasi-Resonant mode (QRM) operation 
  • Various protection schemes
  • Available in SOP7 packages