DC/DC converter rated 25A/300W runs up to 96% efficient

March 21, 2016 // By Graham Prophet
Ericsson’s latest bus converter modules uses the company’s advanced hybrid regulated ratio (HRR) topology to deliver up to 300W and 25A for high-power and high-performance applications; efficiencies are up to 96% at 12V output, cutting cooling burden.

A new, low-profile, 12V-output, digital DC/DC converter module delivering tightly regulated voltages to point-of-load (POL) DC/DC regulators, the module is compatible with the DOSA (Distributed-power Open Standards Alliance) 5-pin eighth-brick footprint standard and offers an input range from 36V to 75V. Use the PKB4313D advanced bus converter for intermediate bus conversion in ICT (Information and Communication Technologies) applications.

Delivering a typical efficiency that exceeds 96% with a 48V input and 12V output at half-load, the module also offers significantly reduced energy and cooling costs. Competitive products will typically dissipate 15% or more power at full load than the PKB4313D, Ericsson claims. It is the first product to be launched from Ericsson’s high-power PKB-D eighth-brick platform and will be followed by 3.3V and 5V output regulators, as well as additional 12V output modules that will offer different input voltage ranges and power levels.

The HRR topology was initially introduced in the company’s high-end quarter-brick PKM-NH family and operates with ratio-regulation in the very-low-input range with the ability to handle transients and sudden changes in input voltage, and it operates in normally regulated fixed-voltage mode from a 42V input and above. The module’s response to line and load transients guarantees the output voltage will remain stable and immune from voltage deviations that are due to power disturbances on the system bus. This retains intermediate bus voltage integrity within the tolerance band required by power system architects.

The module’s powertrain also employs full-bridge synchronous rectification on the primary side, which is not commonly found in competitive devices in this price range. This combined with the use of latest-generation FETs results in excellent efficiency across the entire power range. Use of the HRR control scheme has resulted in a reduction in overall power loss, below a 42V input, of up to 15%.

The regulator provides higher useable power in high ambient temperatures or limited-airflow environments leading to higher reliability. Tellurium copper pins provide excellent