50A digitally-controlled point-of-load DC/DC

December 11, 2014 // By Graham Prophet
Murata’s OKDx-T/50 series of 50A digitally controlled point-of-load (PoL) DC-DC converters join the company’s Okami range of non-isolated converters; they are capable of delivering 50A or 165W from a high power density module measuring 30.85 x 20.0 x 8.2 mm.

Available in three different package formats – through-hole, single-in-line and surface-mount – the converters can be configured and monitored using standard PMBus commands. These POLs have are a footprint-compatible uprating from the 40A OKDx-T/40 series and have 25% higher power density. In addition to all the features of the 40A, these units also have 'Dynamic Loop Compensation', where the PID parameters of the control loop are automatically calculated and configured depending on the operating conditions and output filter. Non-linear transient response decreases response time and output voltage deviation.

Other functions include phase spreading to reduce input capacitance requirements and efficiency losses, and optimised dead-time control that constantly adjusts dead time non-overlap in order to minimise duty cycle and maximise efficiency. Digital current sharing enables 100% current sharing accuracy with up to 7 PoLs in parallel.

The OKDx-T50 series accepts input voltages in the range 4.5 to 14 VDC and provides a configurable output voltage from 0.6 to 3.3 VDC. Typical efficiency is 97.2% at 5 Vin, 3.3 Vout and with 50% load. Standard safety features are output short circuit, over current, output over voltage and input under voltage protection. Power good, remote sense and remote on/off are also included.

Murata Power Solutions; www.murata.com