OR’ing controller raises reliability of shared power systems
Diodes Incorporated has announced an active OR’ing controller chip enabling shared power system designers to replace heat-dissipating blocking diodes with high efficiency MOSFETs. As a result, in up-time critical telecom, server and mainframe applications, the ZXGD3102 will ensure cooler running, lower maintenance and higher reliability operation.The
Sinking a peak turn-off current of 5A, the controller’s gate drive is able to achieve a typical MOSFET turn-off time of 160ns, ensuring the rapid load protection that’s needed to avoid any variation in bus voltage in the event of a power supply failure and hot-swapping. To meet the fault handling requirements, turn-on time can be adjusted to enable a smooth hand over between supplies. The ZXGD3102’s input voltage blocking capability is 180V.
The chip is housed in the compact SM8 package and requires a minimal external component count. It uses a 5 to 15V low current bias rail, which is easily derived using a miniature zener diode. The ZXGD3102 active OR’ing controller is priced at $0.98USD in quantities of 1K.