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PI2002 数据表(PDF) 8 Page - Vicor Corporation

部件名 PI2002
功能描述  Active ORing Controller IC with Load Disconnect Feature
PDF  23 Pages
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制造商  VICOR [Vicor Corporation]
网页  http://www.vicorpower.com
标志 VICOR - Vicor Corporation

PI2002 数据表(HTML) 8 Page - Vicor Corporation

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Picor Corporation • picorpower.com
PI2002
Rev1.1 Page 8 of 23
When the input source voltage is applied and before
the MOSFET is fully enhanced, a voltage greater
than the Forward Over-Current (FOC) Threshold
may be present across the MOSFET. To avoid an
erroneous FOC detection, a VGS detector blanks
the FOC and FWD comparators from initiating a
fault, until the GATE pin reaches 45% of VG-CLMP. If
VC is too low to establish the Gate Clamp condition
the reference for detection is 45% of {VC-V(SN) -
0.25V}.
The GATE pin pulls low under the following fault
conditions:
•
Reverse Current
•
Forward Over-Current “AND” clamp detector is
cleared
•
Over Temperature
•
Input Under-Voltage
•
Input Over-Voltage “AND” nominal Forward
Current
•
VC pin Under-Voltage
Fault:
The fault circuit output is an open collector with 40μs
delay to prevent any false triggering. The FT pin
will be pulled low when any of the following faults
occurs:
•
Reverse Current
•
Forward Over-Current “AND” clamp detector is
cleared
•
Forward Low Current “AND” clamp detector is
cleared
•
Over Temperature
•
Input Under-Voltage
•
Input Over-Voltage “AND” nominal Forward
Current
•
VC pin Under-Voltage
The Forward Current fault condition occurs when the
MOSFETs gates are high but are not conducting a
significant level of forward current or may indicate
the MOSFETs are shorted either internally or
externally (VD1-D2 < 6mV).
The VGS detector prevents FOC or FWD from
initiating a fault when the MOSFET gate is low. The
gate to SN voltage has to reach sufficient voltage to
establish the Rds(on) condition before these faults
are detected.



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