NCV8668 データシートの表示（PDF） - ON Semiconductor
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NCV8668 Datasheet PDF : 21 Pages
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NCV8668
TYPICAL CHARACTERISTICS
Vin
Vout
VRT+V Rhys
VRT
Iout
VRO
VROH
VROL
WINDOW
VWDI
Iout_WD_OFF
Iout_WD_ON
t RD
t RD
t RD
t RR
t IW tmax=4xtOW t CW
t OW
t WD
IW 1st
CW OW
LONG
OW
OW
IW 1st CW
IW 1st CW
IW 1st CW OW
LONG
LONG
LONG
OW
OW
OW
Don‘t Care
during IW
Missing Pulse
during OW
Pulse
during CW
Current Controled
WD −Turn off
Normal
Operation
Figure 26. Window Watchdog Signal Diagram
t
t
t
t RD
t
IW
t
t
Closed window
Open window
Watchdog
trigger signal
Open window
Closed window
WDI
Valid
WDI
WDI
Not valid
WDI
tECW
Watchdog decoder sample point
Figure 27. Valid WDI trigger signal
t EOW
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