Active OR’ing MOSFET controller for PSUs to 400V
A low turn-off threshold voltage enables very low RDS(on) MOSFETs to operate as ideal diodes, providing an efficient power system that is suited for target applications in telecoms systems, data centres and servers, where OR’ing two or more power supplies together provides redundancy.
Recognizing the trend towards using higher system voltages to raise power distribution efficiency, the ZXGD3112N7 also contributes to increased system reliability, since its use in conjunction with low RDS(on) MOSFETs allows operation at lower temperatures compared to the alternative of a Schottky-blocking diode. In addition to increasing system efficiency, its turn-off threshold voltage of <5 mV improves light-load stability, while the ability to turn off in <600 nsec avoids reverse current flow and prevents a voltage drop on the common rail. A 5A sink current ensures a fast discharge of the gates of paralleled MOSFETs.
Turn-off threshold voltage is presented as the best-available and the 400V rating as four times that of competitive OR’ing controllers. In an SO-7 package it is priced at $1.50 (1000).
Diodes Inc; www.diodes.com
