For further information contact your local STMicroelectronics sales office.

May 2012

Doc ID 023212 Rev 1

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STEVAL-ISF001V2

New 3 kW FOT PFC based on the L6563S and STW88N65M5

Data brief

Features

@ 50/60 Hz line

EN55022)

Description

The STEVAL-ISF001V2 demonstration board

provides a compact and ready-to-use solution for

the implementation of a simple PFC system able

to supply loads with a power close to the

maximum delivered in the most typical domestic

installations.

For such a power range the use of a continuous

mode PFC operation becomes mandatory in

order to drain from the net a current with an RMS

value that does not surpass the maximum allowed

from the metering system and to have a

reasonable device size involved in the system

operations.

Normally, the use of a standard continuous mode

driver chip means the use of a more expensive

and complex driver along with all the passive

components required.

STMicroelectronics has patented a solution that

allows the use of a simple driver, designed for

transition mode operation, in a fixed off-time,

variable frequency, PWM modulation.

This kind of modulation gives a current on the

boost inductor of the PFC that is comparable with

the current obtained using a classic continuous

mode modulation.

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