Datasheet
L6566B Application information
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It is worth reminding that “Auto-restart” means that the device will work intermittently as long
as the condition that is activating the function is not removed; “Latched” means that the
device is stopped as long as the unit is connected to the input power source and the unit
must be disconnected for some time from the source in order for the device (and the unit) to
restart. Optionally, a restart can be forced by pulling the voltage of pin 16 (AC_OK) below
0.45 V.
Protection Description Caused by
IC
behavior
Vcc
restart
(V)
IC Iq
(mA)
VREF
(V)
SS
VCOMP
(V)
OSC
(V)
FMOD VFF
Shutdown2
Shutdown
by V
COMP
low
V
COMP
<
V
COMPOFF
Latched 10 0.33 0 0 0 0 0 0
ADAPTIVE
UVLO
Shutdown
by V
cc
going
below V
ccoff
(lowering of
V
ccoff
threshold at
light load)
V
cc
< 9.4V
(
VCOMP
>
V
COMPL
)
Auto
restart
5 V
0.18
mA
00 000 0
V
cc
< 7.2V
(
VCOMP
>
V
COMPO
)
1. Use One external diode from V
FF
(#15) to AC_OK (#16), cathode to AC_OK
2. Use one external diode from SS (#14) to V
REF
(#10), cathode to V
REF
3. If C
ss
and the V
cc
capacitor are such that V
cc
falls below UVLO before latch tripping (Figure 21 on page 34)
4. If C
ss
and the Vcc capacitor are such that the latch is tripped before V
cc
falls below UVLO (Figure 21 on page 34)
5. When T
J
< 110
o
C
6. Discharged to zero by V
cc
going below UVLO
Table 6. L6566B protections (continued)