Diodes AP1662 - Manual (Page 15)

Data Sheet
HIGH PERFORMANCE POWER FACTOR CORRECTOR AP1662
Jul. 2012 Rev. 1. 3 BCD Semiconductor Manufacturing Limited
15
Functional Block Description
（Continued）
Zero Current Detection
AP1662 is a DCM boundary conduction current
mode PFC controller. Usually, the zero current
detection (ZCD) voltage signal comes from the
auxiliary winding of the boost inductor. When the
ZCD pin voltage decreases below 1.6V, the gate
drive signal becomes high to turn on the external
MOSFET. 500mV of hysteresis is provided to avoid
false triggering. The ZCD pin can be used for
disabling the IC. Making its voltage below 0.15V or
short to the ground will disable the device thus
reduce the IC supply current consumption.
Typical Application
Figure 23. 85 to 265V Wide Range Input 90W PFC Demo Board Electrical Schematic Circuit