L6564H

Description

Doc ID 022960 Rev 2

5/35

1

Description

The L6564H is a current-mode PFC controller operating in transition mode (TM) which

embeds the same features existing in the L6564 with the addition of a high voltage startup

source. These functions make the IC especially suitable for applications that must be

compliant with energy saving regulations and where the PFC preregulator works as the

master stage.

The highly linear multiplier, along with a special correction circuit that reduces crossover

distortion of the mains current, allows wide-range-mains operation with an extremely low

THD even over a large load range.

The output voltage is controlled by means of a voltage-mode error amplifier and an accurate

also considerably improves line transient response in the case of both mains drops and

surges (“bi-directional”).

In addition to overvoltage protection able to control the output voltage during transient

conditions, the IC also provides protection against feedback loop failures or erroneous

settings. Other onboard protection functions allow brownout conditions and boost inductor

saturation to be safely handled.

The totem pole output stage, capable of a 600 mA source and 800 mA sink current, is

suitable for a high power MOSFET or IGBT drive. This, combined with the other features

and the possibility to operate with ST's proprietary fixed-off-time control, makes the device

an excellent solution for SMPS up to 400 W that requires compliance with EN61000-3-2 and

JEITA-MITI standards.