PQC20-O 20W 1/16th Brick DC/DC Converters CUI Inc PQC20-O 20W 1/16th Brick DC/DC Converters feature 20W isolated output and a 2:1 input range (36VDC to 60VDC). The CUI Inc PQC20-O offers single regulated outputs and up to 90% efficiency in an industry-standard 1/16th brick package. These DC-DC converters include over-current, input under-voltage, over-voltage, and output short-circuit protection.