Patent ID: 8585875
Filing Date: 2013-11-19
Classification: C25D

Abstract:
1. A method of operation of a substrate electroplating system, comprising: using a controller having an FPGA to independently control output current to two or more electrodes in an electroplating chamber, the FPGA having one or more output channels; monitoring the output current supplied to each electrode and adjusting the output current to a desired setpoint in a feedback loop; electroplating a substrate via current flow through an electrolyte from the electrodes to the substrate; with the output current to the electrodes provided by one of more transistors in each channel, and with the transistors mounted on a heat sink, further comprising: measuring current and voltage output of at least one transistor; measuring a temperature of the heat sink; calculating a die temperature of the at least one transistor based on the measurements of current, voltage and heat sink temperature; and reducing output of the transistor in the calculated die temperature exceeds a predetermined limit.