ICE2PCS01 Datasheet, PDF (8/19 Pages) Infineon Technologies AG – Standalone Power Factor Correction (PFC) Controller in Continuous Conduction Mode (CCM)

Window Detect
Max Vcomp current
V_OUT
95%rated
83%rated
Normal Control
V_OUT =rated
t
av(I_IN) ^{Level-shifted VCOMP}
VCOMP
t
Figure 5 Startup with controlled maximum current
CCM-PFC
ICE2PCS01/G
Functional Description
3.4 System Protection
The IC provides several protection features in order to
ensure the PFC system in safe operating range.
Depending on the input line voltage (V_IN) and output
bus voltage (V_OUT), Figure 7 and 8 show the conditions
when these protections are active.
V_IN (VAC)
VCC > V_CCUVLO
VCC<V_CCUVLO
IC’s
State
Normal
Operation
t
IC OFF
Figure 6 V_IN Related Protection Features
V_OUT
V_OUT,Rated
108%
100%
OLP
PCL / SOC
OVP
20%
t
OLP
Figure 7 V_OUT Related Protection Features
The following sections describe the functionality of
these protection features.
3.4.1 Soft Over Current Control (SOC)
The IC is designed not to support any output power
that corresponds to a voltage lower than -0.75V at the
ISENSE pin. A further increase in the inductor current,
which results in a lower ISENSE voltage, will activate
the Soft Over Current Control (SOC). This is a soft
control as it does not directly switch off the gate drive.
It acts on the nonlinear gain block to result in a reduced
PWM duty cycle.
Version 2.2
8
09 October 2007