CM6565 Datasheet, PDF (13/19 Pages) Champion Microelectronic Corp. – Noise Free 16 pin Self-Start Interleaved PFC with 180 Degree Phase Shift CRM PFC Controller for 90+/85+

CM6565
Noise Free 16 pin Self-Start Interleaved PFC with
180 Degree Phase Shift CRM PFC Controller for 90+/85+
ISENSE master (PIN 8) and ISENSE slave (PIN 9)
Usually, ISENSE slave sensing function is reduced by reducing the PFC slave sensing resistor value to be less than 50% value of
PFC master sensing resistor. Adding a much smaller value of PFC slave sensing resistor is to protect against any catastrophic
fault conditions.
The ISENSE master is comparing the product of Gain Modulator Output current and Rmul and it provides the sine wave envelope
to obtain the sine wave input current. The maximum threshold voltage, which is the product of Gain Modulator output current and
Rmul, is about 500mV. A RC filter which has a 500Khz pole needs to be applied to avoid false triggered by the switching noise.
VCC (PIN 13)
CM6565’s turn on and turn off VCC is like the other PFC product family; on at 13V and off at 10V. It has 50mA zener/shunt
regulator threshold at ~ 16.75V at VCC. The minimum bypass capacitor should be greater than 1uF.
Vref (PIN 14)
Vref is 1% 3mA buffered 7.5V reference. It requires a 0.1uF to 0.01uF bypass capacitor to filter out the switching the noise.
SS (PIN 6)
SS pin 6 is the Soft Start Capacitor pin. CM6565 SS pin provides a close loop soft start for the interleaved CRM PFC.
The Charging Current is about 8uA. By clamping SS below 5V, it disables the 380V to 340V function at light load and both Master
and Slave are on at light load. When SS is above 5V, both light load functions are enabled.
2008/10/09 Rev1.0
Champion Microelectronic Corporation
Page 13