700W Half-Brick DC/DC Converters for LDMOS & GaN RF Power Amplifiers

Flex Power Modules has introduced the PKJ4000 series of DC/DC converters primarily targeting RF power amplifier applications for the telecom market. The new series delivers 28V DC or 50V DC at up to 700 W of power from an input voltage range of 36V to 75V.

Packaged in an industry-standard half-brick format measuring 2.40 x 2.28 x 0.50 inches (61 x 57.9 x 12.7mm), the PKJ4000 achieves a power density of more than 255 W/in3. With special attention being paid to thermal design during the development of the product, conduction cooling of the module is optimized via the attached base-plate, which enables full power delivery at up to 85°C ambient, with a 100°C base-plate temperature and zero airflow in closed-box environments, which is typical within RFPA applications.

Two models are initially available at release. The PKJ4716 APIHS delivers 28V at up to 25A/700 W, with an output voltage adjustment range of 14V to 35V, while the PKJ4716 HPIHS delivers 50V at up to 14A/700 W, adjustable from 25V to 55V. The wide range of adjustability of the outputs makes them not only suitable for RFPA applications using LDMOS or GaN transistor technology, but also for other applications and markets that require a regulated programmable bus voltage such as 24V, 28V, 32V, 48V, 50V or 53/54V, Test and Automation, and Industrial Control and Instrumentation, to name a few.

Other product features of the PKJ4000 series include 1500V input/output isolation, basic level insulation, monotonic start-up, remote sensing, remote control, and a range of protection capabilities including over-temperature, output-short-circuit and output-over-voltage. Offering a calculated MTBF figure of 7.5 Mhrs, the new series has been designed and manufactured by Flex Power Modules to deliver the levels of quality and confidence that are required by power system designers to develop long-term and high-performance reliable platforms.