Hotswap operations for programmable logic devices

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United States of America Patent

PATENT NO 9819174
SERIAL NO

14609181

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Abstract

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Techniques are provided to control hotswap operations with programmable logic devices (PLDs). In particular, a MOSFET is provided to limit an in-rush current drawn from a power supply by capacitive components of an electronic assembly when it is plugged into the live, power supply. A controller with an algorithm is provided to control the MOSFET based on the in-rush current detected at the MOSFET. As such, a feedback control loop is established to selectively bias the gate of the MOSFET based on the detected in-rush current. The algorithm may limit the in-rush current based on a Safe Operating Area (SOA) of the MOSFET. The hotswap process may include multiple phases each with a voltage and/or current limit modeling the voltages and currents of the SOA. The algorithm may transition through the phases with the respective current and/or voltage limits during the hotswap process.

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Patent Owner(s)

Patent OwnerAddress
LATTICE SEMICONDUCTOR CORPORATION5555 NE MOORE CT HILLSBORO OR 97124

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chandra, Srirama Beaverton, US 11 38
Coplen, Joel Hillsboro, US 8 30
Dix, Christopher W Hillsboro, US 3 5
Gwo, Cheng-Jen Beaverton, US 1 2
Mui, Cleo Beaverton, US 3 8

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