ICE2PCS05_10 Datasheet, PDF (9/20 Pages) Infineon Technologies AG – Standalone Power Factor Correction (PFC) Controller in Continuous Conduction Mode

CCM-PFC
ICE2PCS05/G
Functional Description
P_OUT(rated)
IC’s _Normal
State Operation
P_OUT(max)
SOC PCL
V_ISENSE
0
-0.61V -0.75V -1.04V
Figure 8 SOC and PCL Protection as function of
V_ISENSE
The rated output power with a minimum V_IN (V_INMIN) is
P_OUT(rated) = V_INMIN ´ _{-----0---.-6---1------}
R1 × 2
Due to the internal parameter tolerance, the maximum
power with V_INMIN is
P_OUT(max) = V_INMIN ´ _{-----0---.-7---5------}
R1 × 2
3.4.2 Peak Current Limit (PCL)
The IC provides a cycle by cycle peak current limitation
(PCL). It is active when the voltage at pin 3 (ISENSE)
reaches -1.04V. This voltage is amplified by OP1 by a
factor of -1.43 and connected to comparator C2 with a
reference voltage of 1.5V as shown in Figure 9. A
deglitcher with 300ns after the comparator improves
noise immunity to the activation of this protection.
connected) or an insufficient input voltage V_IN for
normal operation. In this case, most of the blocks within
the IC will be shutdown. It is implemented using
comparator C3 with a threshold of 0.6V as shown in the
IC block diagram in Figure 2.
3.4.4 Over-Voltage Protection (OVP)
Whenever V_OUT exceeds the rated value by 8%, the
over-voltage protection OVP is active as shown in
Figure 7. This is implemented by sensing the voltage at
pin VSENSE with respect to a reference voltage of
3.25V. A VSENSE voltage higher than 3.25V will
immediately turn off the gate, thereby preventing
damage to bus capacitor.
3.5 Frequency Setting
The switching frequency of the PFC converter can be
set with an external resistor R5 at FREQ pin as shown
Figure 10. The pin voltage V_FREQ is typically 1.7V. The
corresponding capacitor for the oscillator is integrated
in the device and the R5/frequency relationship is given
at the “Electrical Characteristic” section. The
recommended operating frequency range is from
20kHz to 250kHz. As an example, a R5 of 33kW at pin
FREQ will set a switching frequency F_SW of 134kHz
typically.
Full-wave
Rectifier
ISENSE
R2
I_INDUCTOR
R1
Current Limit
1.5V
1.43x
OP1
Deglitcher
C2
300ns _TurnOff
Driver
Figure 9 Peak^ICC^Eu²rr^Pe^Cn^St ⁰L¹im^/Git (PCL)
3.4.3
Open Loop Protection / Input Under
Voltage Protect (OLP)
Whenever VSENSE voltage falls below 0.6V, or
equivalently V_OUT falls below 20% of its rated value, it
indicates an open loop condition (i.e. VSENSE pin not
Figure 10
Version 1.2
9
Frequency Versus R_FREQ
22 Mar 2010