EVALPFC2-ICE2PCS01 Infineon Technologies, EVALPFC2-ICE2PCS01 Datasheet - Page 6

BOARD DEMO 300/500W CCM-PFC SMPS

EVALPFC2-ICE2PCS01

Manufacturer Part Number
EVALPFC2-ICE2PCS01
Description
BOARD DEMO 300/500W CCM-PFC SMPS
Manufacturer
Infineon Technologies
Datasheet

Specifications of EVALPFC2-ICE2PCS01

Main Purpose
Power Management, Power Factor Correction
Embedded
No
Utilized Ic / Part
ICE2PS01
Primary Attributes
300W, 393V & 750mA Out, 85~265VAC In
Secondary Attributes
Boost Converter, Continuous Conduction Mode
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
EVALPFC2-ICE2PCS01IN
3 Technical specifications:
Input voltage
Input frequency
Output voltage and current
Output power
Efficiency
Switching frequency
4 Circuit Description
Line Input
The AC line input side comprises the input fuse F1 as over-current protection. The high frequency
current ripple is filtered by R1, L1 and CX1. The choke L2, X2-capacitors CX1 and CX2 and Y1-
capacitor CY1 and CY2 are used as radio interference suppressors. RT1 is placed in series to limit
inrush current during each power on.
Power Stage
After the bridge rectifier BR1, there is a boost type PFC converter consisting of L3, Q1, D1 and C2.
The third generation CoolMOS™ is used as the power switch Q1. Due to its low Rdson, the small
heat sink can fulfill the dissipation requirement. SiC Schottky diode thinQ!™ is used for D1. As SiC
Schottky diode does not show a reverse recovery behavior, the stress on the MOSFET will be
reduced due to very low current spike during turn on transient. Simultaneously higher reliability of the
entire system can be achieved. However, due to the poor pulse current capability of SiC Schottky
diode, a standard diode D2 is necessary to bypass the high inrush current during each power on
transient. Output capacitor C2 provides energy buffering to reduce the output voltage ripple (100Hz)
to the acceptable level.
PWM control of Boost Converter
The PWM control is realized by 8-Pin CCM PFC IC ICE2PCS01. Unlike the conventional PFC
controller, ICE2PCS01 does not need direct sine wave reference signal. The switching frequency is
fixed and programmed by R8. There are two control loops in the circuit, voltage loop and current loop.
The output voltage is sensed by the voltage divider of R5A, R5B, R6A and R6B and sent to internal
error amplifier. The output of error amplifier is used to control current in the inner current loop. The
compensation network C4, C5, R7 constitutes the external circuitry of the error amplifier. This circuitry
allows the feedback to be matched to various load conditions, thereby providing stable control. In
order not to make the response for 100Hz ripple, the voltage loop compensation is implemented with
low bandwidth. The inner loop, current control loop, is implemented with average current mode
strategy. The instant current is adjusted to be proportional to both of MOSFET off duty D
error amplifier output voltage of voltage loop. The current is sensed by shunt resistors R2, R2A and
R2B and fed into IC through R9. The current sense signal is averaged by an internal operating
amplifier and then processed in the PWM generator which drives the gate drive. The averaging is
realized by charging and discharging an external capacitor C7.
The IC supply is provided by external voltage source and filtered and buffered by C8 and C9. The IC
output gate driver is a fast totem pole gate drive. It has an in-built cross conduction current protection
and a Zener diode to protect the external transistor switch against undesirable over voltages. The
gate drive resistor R4 is selected to limit and gate pulse current and drive MOSFET for fast switching.
5 Circuit Operation
Soft Start
When Vcc pin is higher than turn-on threshold, typical 11V, PFC is going to start. The unique soft start
is integrated. Input current keeps sinusoidal and is increasing gradually until output voltage reaches
Boost Type PFC Converter
85VAC~265VAC
50Hz
393VDC, 0.75A
~ 300W
>90% at full load
62.5kHz (with R8=76K)
6
OFF
and the

Related parts for EVALPFC2-ICE2PCS01