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NCP349MNTBG

P1-P3P4-P6P7-P9P10-P12
NCP349
http://onsemi.com
7
TYPICAL OPERATING CHARACTERISTICS
Figure 13. Inrush Current with C
out
= 100 mF,
I charge = 1 A, Output Wall Adaptor Inductance 1 mH
Figure 14. Output Short Circuit
Figure 15. Output Short Circuit (Zoom Fig. 14)
NCP349
http://onsemi.com
8
VOLTAGE DETECTION
IN OUT
CONDITIONS
V
IN
> OVLO
0 < V
IN
< UVLO
And/Or
/EN = 1
VOLTAGE DETECTION
IN OUT
CONDITIONS
/EN = 0
&
UVLO < V
IN
< OVLO
Figure 16. Simplified Diagram
Figure 17. Simplified Diagram
Operation
The NCP349 provides overvoltage protection for
positive voltage, up to 28 V. A low R
DS(on)
NMOSFET
protects the systems (i.e.: charger) connected on the Vout
pin, against positive overvoltage. At powerup, with EN pin
= low, the output is rising up t
on
soft−start after the input
overtaking undervoltage UVLO (Figure 3). The NCP349
provides a FLAG output, which alerts the system that a fault
has occurred. A t
start
additional delay, regarding available
output (Figure 3) is added between output signal rising up
and to FLAG signal rising up. FLAG pin is an open drain
output.
NCP349
http://onsemi.com
9
Timer Check
Check V
in
FLAG = Low
Timer Count
Timer Check
V
in
< UVLO or
V
in
> OVLO
Check EN
Check EN
V
out
= V
in
FLAG = High
Check V
in
V
out
= Open
FLAG = High
Check V
in
Figure 18. State Machine
OVLO > V
in
> UVLO
T < t
on
T = t
on
Reset Timer
V
out
= 0
FLAG = Low
Reset Timer
V
in
< UVLO or
V
in
> OVLO
V
out
= 0
FLAG = Low
Timer Count
UVLO < V
in
< OVLO
EN = 0EN = 1
V
in
< UVLO or
V
in
> OVLO
UVLO < V
in
< OVLO
EN = 0EN = 1
T = t
on
V
out
= Open
V
in
< UVLO or
V
in
> OVLO
T < t
on
UVLO < V
in
< OVLO
V
out
= V
in
P1-P3P4-P6P7-P9P10-P12

NCP349MNTBG

Mfr. #:
Buy NCP349MNTBG
Manufacturer:
ON Semiconductor
Description:
Current & Power Monitors & Regulators POSITIVE OVP
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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