CM6565GIP CHAMP [Champion Microelectronic Corp.], CM6565GIP Datasheet - Page 11

• Manufacturer Part Number: CM6565GIP
• Description: Noise Free 16 pin Self-Start Interleaved PFC with 180 Degree Phase Shift CRM PFC Controller for 90+/85+
• Manufacturer: CHAMP [Champion Microelectronic Corp.]

IAC (PIN 1):
IAC serves several functions:
During the system Start-Up, IAC pin is connected to VCC; therefore, the external RAC which is between IAC and
line input voltage can be served as a Start-Up resistor (bleed resistor). Once VCC is greater than UVLO, 13V, IAC
pin will be connected to the multiplier input which is a current mirror and IAC voltage is about 1.4V.
Usually, the value of the RAC is between 4 Mohm to 10 Mohm.
Green Mode with Fast Start Up with high voltage bipolar and low voltage diode.
The following circuit can be used for the Fast Start Up, if the on time needs to be less than 100mS and Green Mode
Performance is needed.
After VCC is greater than UVLO, IAC is connected to the input of the current mirror which is also the input of the
multiplier. This current input multiplier is less sensitive to the noise since it is sensing current instead of the voltage,
not like the conventional voltage input multiplier which senses the voltage and requires a two resistor network to
sense the line input voltage information.
2008/10/09 Rev1.0
Line Input Voltage
180 Degree Phase Shift CRM PFC Controller for 90+/85+
Champion Microelectronic Corporation
Noise Free 16 pin Self-Start Interleaved PFC with
IAC
RAC 1
RAC 2
4M
100K
VCC
Q1
NPN
RIVCCLIMIT
DLOWVOLTAGE
50K
CM6565
Page 11