Optimized for 50-V GaN RFPAs and high-voltage LDMOS applications

By Alex Pluemer, contributing writer

Flex Power
, a division of Flex, recently introduced the PKB4216HDPI, the
newest edition to its family of DC/DC converters designed for radio frequency
power amplifier (RFPA) applications in the telecom sector. A descendant of Flex’s
750 W PKJ4000 series, the PKB-D high-density converter, packaged in an eighth-brick
format, is optimized for high-voltage LDMOS applications and 50-V GaN-based

features an input voltage range of 36 V to 60 V and an output of 50 V at 5 A. A
wide-output voltage adjustment range of 40 VDC to 55 VDC offers developers the
opportunity to optimize the connected RF section, with typical peak efficiency of
94.5% at 48 Vin and full load.

The PKB-D is
available with a baseplate, designed to ensure conduction cooling in typical RFPA
application environments inside sealed enclosures with no airflow. This allows
for full-power operation at up to 85°C baseplate temperature and an output of
up to 4 A/200 W at 100°C baseplate temperature. The operating temperature range
of the device is –40°C to 125°C.

PKB4216HDPI features a half-bridge design with the lastest PWM controller
technology, ensuring a high level of integration for low component count and high
reliablity (up to 10.68 Mhrs). Implementing synchronous rectification also
contributes to the device’s high power density.

PKB-D provides protection against short-circuits, overloads, overtemperature, and
output overvoltage and input undervoltage. The device also features a remote
on/off control with optional positive or negative logic. Startup into pre-biased
loads is guaranteed, and the isolation rating from primary to secondary is 2,250

PKB4216HDPI is available in OEM production quantities.

Learn more about Flex Power Modules