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Part Name
Description
NCP349(2009) View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
NCP349
(Rev.:2009)
Positive Overvoltage Protection Controller with Internal Low RON NMOS FET
ON Semiconductor
NCP349 Datasheet PDF : 12 Pages
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NCP349
V
out
= 0
FLAG = Low
Reset Timer
V
in
< UVLO or
V
in
> OVLO
V
out
= 0
FLAG = Low
Timer Count
OVLO > V
in
> UVLO
Timer Check
T = t
on
Reset Timer
T < t
on
V
in
< UVLO or
V
in
> OVLO
Check V
in
FLAG = Low
Timer Count
V
out
= Open
EN = 1
UVLO < V
in
< OVLO
Check EN
EN = 0
V
out
= V
in
V
in
< UVLO or
V
in
> OVLO
Timer Check
T = t
on
T < t
on
UVLO < V
in
< OVLO
Check EN
UVLO < V
in
< OVLO
EN = 1
EN = 0
V
out
= Open
FLAG = High
Check V
in
V
in
< UVLO or
V
in
> OVLO
V
out
= V
in
FLAG = High
Check V
in
Figure 18. State Machine
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