48V regulators deliver 100W from a 1-cm-square package

May 25, 2015 // By Graham Prophet
Vicor has added to its Picor Cool-Power ZVS regulator range with 48V buck regulators that enable direct stepdown from 48V distribution buses to point-of-load with high efficiency. Vicor says that these device increase flexibility for designers and power system architects; as well as regulated-voltage outputs, these parts can be used in a constant-current mode for applications such as LED lighting and battery management.

Peak efficiency exceeding 96% is achieved at 48V to 12V stepdown. The added devices are the PI3542, PI3543, PI3545, and PI3546 buck regulators, all of which use Vicor’s zero-voltage switching (ZVS) topology; a high-density 10 x 10 x 2.5 mm LGA system in package (SiP) module handles power delivery over 100W

With step-down regulation from a higher voltage source, engineers can deploy more efficient power distribution architectures, reduce I ²R losses, and eliminate costly and inefficient intermediate conversion stages. The PI354x series operates from 36 Vin to 60 Vin, and deliver a regulated output voltage ranging from 2.2V to 14V, with output current delivery up to 10A. Power delivery can be further increased by using single wire current sharing without any additional components. At a 48V to 5V stepdown efficiency of around 93% is achieved. When used in conjunction with Vicor’s front-end products and Factorised Power products, the PI354x series can – the company says – enable a complete power chain from AC or HVDC (200 V+) source to PoL.

Building on its applicability to large-scale lighting designs – commercial/retail lighting, and large matrix panels – Vicor adds that it will add more lighting-related features, such as dimming, to the portfolio.

PI354x series pricing starts at $12.80 (1000).

Vicor; www.vicorpower.com