L6566ATR datasheet(41/51 Pages) STMICROELECTRONICS

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L6566A

Application information

41/51

5.14

Summary of L6566A power management functions

It has been seen that the device is provided with a number of power management functions:

multiple operating mode upon loading conditions, protection functions, as well as interaction

with the PFC pre-regulator. To help the designer familiarize with these functions, in the

following tables all of theme are summarized with their respective activation mechanism and

the resulting status of the most important pins. This can be useful not only for a correct use

of the IC but also for diagnostic purposes: especially at prototyping/debugging stage, it is

quite common to bump into unwanted activation of some function, and these tables can be

used as a sort of quick troubleshooting guide.

Table 6. L6566A light load management features

Feature Description

Caused

behavior

Vcc_restart

(V)

Consump.

(Iqdis,mA)

VREF

(V)

VCOMP

(V)

OSC

(V)

FMOD

Burst

mode

Controlled

ON-OFF

operation for

low power

consumption

at light load

VCOMP <

VCOMPBM -

Hys

Pulse

skipping

operation

N.A.

1.34mA

unchan

ged

VCOMPB

M-HYS to

VCOMPB

0/1

PFC

manage

ment

PFC off at

light load, on

at heavy load

VCOMP <

VCOMPO

VCC_PFC =

N.A.

unchan

ged

unchang

VCOMP <

VCOMPL

VCC_PFC =

VCC

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