ICE1PD265G Infineon Technologies Corporation, ICE1PD265G Datasheet - Page 7

• Manufacturer Part Number: ICE1PD265G
• Description: Power Factor Controller + Cool- Mos Boostset Ic For High Power Factor And Low Thd
• Manufacturer: Infineon Technologies Corporation

ICE1PD265G
Multiplier
The one quadrant multiplier regulates the gate driver with respect of the DC output voltage and the
AC half wave rectified input voltage. Both inputs are designed to achieve good linearity over a wide
dynamic range to represent an AC line free from distortion. Special efforts are made to assure uni-
versal line applications with respect to a 90 to 270 V AC range.
The multiplier output is internally clamped at 1.0V. So the MOSFET is protected against critical
operating during start up.
Current sense comparator, LEB and RS Flip-Flop
An external sense resistor transferes the source current of the MOSFET into a sense voltage.The
multiplier output voltage is compared with this sense voltage.
To protect the current comparator input from negative pulses a current source is inserted which
sends current out of the ISENSE pin every time when ISENSE is falling below ground potential. The
switch-on current peak of the MOSFET is blanked out via a resistor-capacitor circuit with a blanking
time of typically 220ns. Therefore better THD is achieved at low load conditions.
The RS Flip-Flop ensures that only one single switch-on and switch-off pulse appears at the gate
drive output during a given cycle (double pulse suppression).
Zero Current Detector
The zero current detector senses the inductor current via an auxiliary winding and ensures that the
next on-time of the MOSFET is initiated immediately when the inductor current has reached zero.
This diminishes the revers recovery losses of the boost converter diode. The MOSFET is switched
off when the voltage drop of the shunt resistor reaches the voltage level of the multipler output. So
the boost current waveform has a triangular shape and there are no deadtime gaps between the
cycles. This leads to a continuous AC line current limiting the peak current to twice of the average
current.
To prevent false tripping the zero current detector is designed as a Schmitt-Trigger with a hysteresis
of 0.5V. An internal 5V clamp protects the input from overvoltage breadkdown, a 0.6V clamp pre-
vents substrate injection. An external resistor has to be used in series with the auxiliary winding to
limit the current through the clamps.
Restart Timer
If the MOS is off for more than 150us a restart impulse is generated by the restart timer.
Version 1.0
7
10 Sep 2001