Flex Power Modules boosts portfolio for RFPA applications

Flex Power Modules has launched the PKB4216HDPI, the latest model in its series of DC-DC converters aimed at Radio Frequency Power Amplifier (RFPA) applications in the telecom market segment.

Following on from the recently introduced 750W PKJ4000 series, the PKB-D is a high-density converter in the industry standard eighth-brick format with an output of 50V at 5A, and an input voltage range of 36 to 60V. This makes it suitable for 50V GaN based RFPA’s and also high voltage LDMOS applications.

The PKB4216HDPI has a wide output voltage adjustment range of 40 – 55VDC allowing for easy optimisation of the connected RF section, with typical efficiency peaking at 94.5% at 48Vin and full load. Comprehensive protection is provided including short-circuit, overload, over-temperature, output over-voltage, and input under-voltage. Start-up into pre-biased loads is guaranteed, and the isolation rating is 2250VDC from primary to secondary. A remote on/off control is provided with optional positive or negative logic.

The part is available with a baseplate option for conduction cooling inside sealed enclosures with no airflow, typical of RFPA applications. This allows full-power operation at up to 85°C baseplate temperature, and up to 4A / 200W output at 100°C baseplate temperature. The full operating temperature range for the device is -40°C to +125°C, with excellent derating characteristics.

The half-bridge design of the PKB4216HDPI features the latest PWM controller technology with a high level of integration for low component count and high reliability. Synchronous rectification contributes to cutting-edge efficiency performance leading to high power density and extremely high reliability figures of up to 10.68 Mhrs.

Author
Neil Tyler