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NCV8660B Scheda tecnica(PDF) 10 Page - ON Semiconductor

Il numero della parte NCV8660B
Spiegazioni elettronici  Very Low Iq LD0 150 mA Regulator Delay Time Select
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCV8660B Scheda tecnica(HTML) 10 Page - ON Semiconductor

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NCV8660B
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10
IN
OUT
RO
Reset Delay Time
Reset
Threshold
Plus
Hysteresis
Thermal
Shutdown
Voltage Dip
at Input
Secondary
Spike
Overload
at Output
Reset
Reaction
Time
t
t
t
OUT Reset Threshold plus Hysteresis
OUT Reset Threshold
Figure 25. Reset Timing
Thermal Shutdown
minus
Thermal Hysteresis
Reset Delay Time
Reset Delay Time
t < Reset Reaction Time
During power−up (or restoring OUT voltage from a reset
event), the OUT voltage must be maintained above the Reset
threshold for the Reset Delay time before RO goes high. The
time for Reset Delay is determined by the choice of IC and
the state of the DT pin.
Reset Delay Time Select
Selection of the NCV8660B device and the state of the DT
pin determines the available Reset Delay times. The part is
designed for use with DT tied to ground or OUT, but may be
controlled by any logic signal which provides a threshold
between 0.8 V and 2 V. The default condition for an open DT
pin is the slower Reset time (DT = GND condition). Times
are in pairs and are highlighted in the chart below. Consult
factory for availability.
DT=GND
DT=OUT
Reset Time
Reset Time
NCV86601B
8 ms
128 ms
NCV86602B
8 ms
32 ms
NCV86603B
16 ms
64 ms
NCV86604B
32 ms
128 ms
The Delay Time select (DT) pin is logic level controlled
and provides Reset Delay time per the chart. Note the DT pin
is sampled only when RO is low, and changes to the DT pin
when RO is high will not effect the reset delay time.
Thermal Shutdown
When the die temperature exceeds the Thermal Shutdown
threshold, a Thermal Shutdown event is detected OUT is
turned off, and RO goes low. The IC will remain in this state
until the die temperature moves below the shutdown
threshold (175
°C typical) minus the hysteresis factor (25°C
typical). The output will then turn back on and RO will go
high after the RESET Delay time.


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