Datasheet

L6591 Summary of L6591 power management functions
Doc ID 14821 Rev 6 35/41
Note: All values are typical unless otherwise specified.
It is worth remembering that “auto-restart” means that the device works 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.
Protection Description Caused by
IC
behavior
Vcc
restart
[V]
IC Iq
[mA]
VREF
[V]
SS
V
COMP
[V]
OSC
[V]
PFC_STOP
2
nd
OCP
Transformer
saturation or
shorted
secondary
diode
protection
V
ISEN
>
1.5 V for 2
consecutive
switching
cycles
Latched
(2)
5
0.35
max.
00 0StopActive (low)
DISABLE
Externally
programmabl
e latched
protection
V
DIS
>
4.5 V
Latched 13
0.35
max.
00 0StopActive (low)
Brownout
Mains
undervoltage
protection
V
LINE
<
1.25 V
Auto-
restart
5
0.35
max.
00 0Stop
Not active
(high Z)
1. Use one external diode from SS (#14) to VREF (#10), cathode to VREF.
2. The condition is latched as long as the IC is supplied; the HV generator is not invoked.
Table 6. Protection (continued)
Protection Description Caused by
IC
behavior
Vcc
restart
[V]
IC Iq
[mA]
VREF
[V]
SS
V
COMP
[V]
OSC
[V]
PFC_STOP