Flex expands PKU-D DC/DC range
Flex Power Modules has expanded its PKU-D range with two high-efficiency DC/DC converters – the PKU4911D and PKU4917VD – designed for low power radio-frequency power amplifiers (RFPAs) and microwave applications. The additions strengthen the PKU-D family of analogue-controlled DC/DC converters in a sixteenth-brick format suited to the size and thermal limits typical of dense RF and telecom boards.
The PKU4911D is a 5 V nominal (4-5.5 V adjustable), 100W converter with a 36‑75 V input range. Typical efficiency is 93 percent at 48 V input and full load, reducing heat losses and helping engineers stay within thermal limits in compact RFPA assemblies. It provides a stable, low-noise output (2 percent max) for RF and microwave stages where voltage stability and ripple are critical performance factors.
The PKU4917VD is a 6 V nominal (5.5-6.6 V), 100 W converter in the same sixteenth-brick PKU-D form factor and accepts 36‑60 V input. Efficiency reaches 92.7 percent, helping reduce heat and ease cooling requirements. The 6 V rail provides a stable intermediate voltage that can directly power driver and control circuits efficiently.
Validated thermal models are available for both modules to speed derating decisions and heatsink/airflow sizing. Sharing the established PKU-D footprint allows design teams to reuse board layouts across voltage options with minimal modification, shortening development cycles for 5G/6G network microwave links, satellite communications and radar equipment.
“In RF and microwave systems, managing heat effectively is just as critical as saving space,” said Olle Hellgren, director, product management & marketing at Flex Power Modules. “By offering 5 V and 6 V options at around 93 percent efficiency in a sixteenth-brick format along with ready-to-use thermal models, engineers are empowered with practical solutions to reduce design cycles and time to market.”
Both modules comply with telecom and industrial safety standards for isolated DC/DC converters, with 2250 V input-to-output isolation for use in RF/microwave equipment. They are approved to IEC/EN/UL 62368-1 safety requirements and are suitable for use in high-reliability infrastructure such as 5G/6G microwave links, satellite and radar systems.
