PI2001 datasheet(8/23 Pages) VICOR

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be {VG-SP = VC - VSP – 0.5V}. Note that VC is the

controller internal regulated voltage.

When a reverse current fault is initiated, the gate

driver pulls the GATE pin low and discharges the

FET gate with 4Apeak capability.

When the input source voltage is applied and before

the MOSFET is fully enhanced, a voltage greater

than the Forward Over Current (FOC) Threshold will

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 77% of VG-CLMP. If

VC is too low to establish the Gate Clamp condition

the reference for detection is 77% of {VC-V(SP) -

0.25V}.

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

occur:

•

Reverse current

•

Forward Over-Current

•

Forward Low Current

•

Over-Temperature

•

Input Under-Voltage

•

Input Over-Voltage

•

VC pin Under-Voltage

The only fault condition that initiates gate turn-off of

the MOSFET (as well as a fault flag signal) is when

the reverse current fault conditions are met. All other

fault conditions issue only a fault flag signal via the

FT pin, but do not affect the gate of the MOSFET.

The FT pin serves as an indicator that a fault

condition may be present. This information can be

reported to a Host to signal that some system level

maintenance may be required.

Picor Corporation • picorpower.com

PI2001

Rev 1.0

Page 8 of 23

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