LD7593AA/AB6-Pin Transition-Mode PFC Controller

The LD7593AA/AB is a voltage mode PFC controller operating on transition mode, with several integrated functions of protection, such as OVP and OCP. It reduces the components counts and is available in a SOT-26 package. Those make it an ideal design for low cost applications.

The LD7593AA/AB adopts transition mode for power factor correction and realizes high efficiency performance and a low switching noise by zero current switching. The exquisite designed CS pin integrates inductor current limit, ZCD detection, and 2nd OVP on one pin. The special designed ZCD detection method eliminates the need for ZCD auxiliary winding.




  • Transition Mode of PFC Pre-Regulator
  • Voltage Mode Control
  • ZCD Auxiliary Winding is Unnecessary
  • Low Startup Current (<1mA)
  • LEB (Leading-Edge Blanking) on CS pin
  • OCP (Cycle by Cycle Current Limit)
  • VO OVP (Over Voltage Protection) on INV pin
  • VO OVP (Over Voltage Protection) on CS/ZCD pin
  • -700/300mA Driving Capability
  • Internal OTP (Over Temperature Protection)



  • Desktop PC
  • Adaptor
  • LCD TV Power Supply