Datasheet
Application information L6566B
42/51
Table 6. L6566B protections
Protection Description Caused by
IC
behavior
Vcc
restart
(V)
IC Iq
(mA)
VREF
(V)
SS
VCOMP
(V)
OSC
(V)
FMOD VFF
OVP
Output
overvoltage
protection
V
ZCD
>V
ZCDt
h
for 4
consecutive
switching
cycles
Auto
restart
(1)
52.25
(6)
unchanged
(6)
0 0 0 unchanged
VFF >
VFFlatch
Latched 13.5 0.33 0 0 0 00 0
OLP
Output
overload
protection
V
COMP
=V
COMPHi
V
SS
>
V
SSDIS
Auto
restart
(2)
5 1.46 5
(6)
V
SS
<V
SSLAT
(3)
V
COMPHi
(6)
0 0 unchanged
V
COMP
=V
COMPHi
V
SS
>
V
SSLAT
Latched 13.5 0.33 0 0 0 0 0 0
Short circuit
protection
Output short
circuit
protection
V
COMP
=V
COMPHi
V
SS
>
V
SSDIS
(4)
Auto
restart
5 1.46 0
V
SS
<V
SSLAT
(6)
V
COMPHi
(5)
0 unchanged
V
COMP
=V
COMPHi
V
SS
>
V
SSLAT
(6)
Latched 13.5 0.33 0 0 0 0 0 0
2
nd
OCP
Transformer
saturation or
shorted
secondary
diode
protection
V
CS
>
V
CSDIS
for 2-3
consecutive
switching
cycles
Latched 5 0.33 0 0 0 0 0 0
OTP
Externally
settable
overtempera
ture
protection
V
DIS
>V
OTP
Latched 13.5 0.33 0 0 0 0 0 0
Internal
thermal
shutdown
T
j
> 160
o
C
Auto
restart
(5)
5 0.33 0 0 0 0 0 0
Brownout
Mains
undervoltag
e protection
V
AC_OK
<
V
th
Auto
restart
5 0.33 0 0 0 0 0 unchanged
Reference
drift
V
REF
drift
protection
V
REF
> V
ov
Latched 13.5 0.33 0 0 0 0 0 0
Shutdown1
Gate driver
disable
V
FF
> V
off
Auto
restart
5 2.5 5 unchanged
unchang
ed
1
uncha
nged
unchanged