L6566ATR(2007) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
L6566ATR Datasheet PDF : 51 Pages
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L6566A
Application information
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
by
IC Vcc_restart Consump. VREF
behavior
(V)
(Iqdis,mA) (V)
SS
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
VCOMPB
5
unchan M-HYS to
ged VCOMPB
0/1
0
M
PFC
PFC off at
manage light load, on
ment at heavy load
VCOMP <
VCOMPO
VCC_PFC =
0
N.A.
5
unchan unchang
ged
ed
1
0
VCOMP <
VCOMPL
VCC_PFC =
VCC
VCC
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