Datasheet

AN4165 Functional check
Doc ID 023661 Rev 1 23/37
shorting the low-side resistor of the output voltage divider, R4 = R4a + R4b. The same
behavior can be caused by opening the high-side resistor, R3.
The protection acts in auto-restart mode with t
RESTART
= 1 s ( Figure 31 ). When the fault is
removed, normal operation is restored after the last t
RESTART
interval has been completed
(
Figure 33 ).
Figure 30. Feedback loop failure protection:
tripping
Figure 31. Feedback loop failure protection:
steady-state
AM11578v1
Normal
operation
< t
OVL
Fault is applied here
V
DD
reaches V
DDCLAMP
AM11579v1
t
RESTART
Figure 32. Feedback loop failure protection:
steady-state, zoom
Figure 33. Feedback loop failure removal:
converter restart
AM11580v1
< t
OVL
AM11581v1
t
RESTART
Fault is removed here
Normal
o
p
eration