200W DC/DC has ultra-wide output voltage range for radio PA applications

February 16, 2015 // By Graham Prophet
From Ericsson, this 200W DC/DC converter module in an eighth-brick format has been designed for radio-frequency power amplifier (RFPA) applications and supplying the PA transistors that are used in new generation of integrated radio amplifiers.

The module series features ultra-wide output voltage range from 15V to 33V; enhanced thermal layout improves power dissipation for cold-wall assembling; an adjustable voltage range means ability to handle wide range of power transistors and reduce power consumption when system is in sleep mode; and the module delivers 95% typical efficiency at 30V output half load.

Delivering power up to 200W and an output current up to 6.67A, the PKB4216C is suitable for powering RFPA applications that use semiconductor technologies such as Laterally Diffused Metal Oxide Semiconductor (LDMOS).

In addition to powering RFPA applications, the output voltage range meets specifications as defined by the Antenna Interface Standards Group (AISG), which mandates a 10 to 30V input voltage range to power active RF antennas. The module’s voltage range also covers 24V and 28V, making it suitable for its use in industrial applications interconnected to ICT equipment that requires either a sub-24V or 28V supply from the mains rectifier.

A key feature of the PKB4216C series is that it has been designed for deployment in environments where only natural convection will be available. The series’ mechanical design has been optimised to reduce thermal resistance to an absolute minimum between power dissipating components and the cold-wall conduction-cooling element, thereby delivering thermal performance for applications that have limited airflow such as integrated antennas.

Available in an industry-standard eighth-brick footprint with dimensions of 2.3 x 0.89 in. and a low-profile height of 0.34 in. (58.4 x 22.7 x 8.6 mm), the module delivers 95% typical efficiency at 30V output half load, guaranteeing low power dissipation and reduced energy consumption. Operating over a 36V to 75V input-voltage range, the PKB4216C series meets requirements for normal input-voltages ranges in 48 and 60V(DC) systems.

Offering an MTBF (Mean-Time-Before-Failure) of 3.53 million hours, the PKB4216C series meets safety requirements according to IEC/EN/UL 60950-1 and offers input/output isolation of 1500V DC. The series also includes protection features including output-over-voltage protection