Run logic direct from 48V distribution with integrated HV regulator

February 14, 2014 // By Graham Prophet
A pair of high voltage linear regulators are designed for use in 48V DC power systems in telecom, networking and Power-over-Ethernet equipment. Integrating several components into TO252-4 and PowerDI5060-8 packages, the ZXTR1005K4 and ZXTR1005PD8 help minimise circuit footprint while providing a fixed 5V (±2%) output and a high drive capability of 50 mA.

For high voltage regulation tasks, where industry standard linear regulators can't be used, the ZXTR1005 provides a cost effective alternative that offers a significant improvement in supply reliability. The regulated 5V output enables microcontrollers to be powered from 48V telecom rails, while the devices' 100V-tolerant inputs cope with any transient conditions.

The ZXTR1005's high performance line and load regulation capability also ensures transient voltage drops will not result in latch-up, thereby safeguarding continuous operation of the voltage supply. To simplify regulator control and aid diagnostics, the device includes an active high enable pin allowing the output to be toggled on and off.

The ZXTR1005K4 (TO252-4) and ZXTR1005PD8 (PowerDI5060-8) are priced at $0.30 (10,000).

Diodes Inc.;