Lattice Semiconductor Corporation

Christopher W Dix

Srirama Chandra

Joel Coplen

Cleo Mui

Cheng-Jen Gwo

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.

Hotswap operations for programmable logic devices

In accordance with an embodiment of the present invention, two transistors are simultaneously controlled by a controller to control the application of power to a load and monitor a voltage level at the load. The controller may control the application of power to a number of loads simultaneously and may further provide voltage tracking for the loads.

Growing community of inventors

Hillsboro, OR, United States of America

Christopher W Dix