ICE1CS02 Datasheet, PDF (7/27 Pages) Infineon Technologies AG – Combi PFC/ PWM Controller

Combi PFC/ PWM Controller
ICE1CS02
Pin Configuration and Functionality
PFC ISENSE (Current Sense Input)
The ISENSE Pin senses the voltage drop at the
external sense resistor (R1). This is the input signal for
the average current regulation in the current loop. It is
also fed to the peak current limitation block.
immediately switched off. Furthermore the current
information is used for Current Mode control. Slope
compensation is activated when Vsync is less than
3.0V.
VINS (Input Voltage Sensing)
The VINS pin can sense the rectified AC main line
signal. When the signal drops below the voltage set
externally, the gate signal will stop and it would resume
with soft-start when the signal exceeds the voltage
externally set.
VINS HYS (Input Voltage Sensing hystersis)
This pin is the output of a comparator. Putting a resistor
between VINS and VINS HYS will set the hystersis of
PFC Brown Out protection.
VREF (Reference Voltage)
This pin is the output of buffer, which has a capability of
supplying 5V with a 12mA sourcing current (minimum).
When the output is pulled to low, the PWM portion will
stop switching and when the output is released, the
PWM will resume switching with soft-start.
PWM FB (PWM Feedback)
The IC will obtain the output information through his
pin. The internal Protection Unit and the internal PWM-
Comparator will then control the duty cycle.
PWM Pre-short
This pin set the blanking time the IC will enter into
Output Pre-short protection mode by connecting a
capacitor.
PWM SYNC (External Sychronization) and Duty
Cycle (Duty Cycle Selection)
This pin allows 2 functions: 1)synchronization of
external oscillator with internal PWM clock and 2) Duty
Cycle selection. The frequency range is from 70kHz to
150kHz while PFC frequency range is from 35kHz to
75kHz respectively and the duty cycle is set according
to resistor tied to the pin, setting the max duty cycle to
either to 47% or 60%. If Vsense is greater than 2.6V
(Vout is greater than 330V), the max duty cycle will still
be set back to 47%.
PWM CS (Current Sense)
The Current Sense pin senses the voltage developed
on the series resistor inserted in the source of the MOS
switch. If CS reaches the internal threshold of the
Current Limit Comparator, the Driver output is
Version 1.0
7
25 July 2008