Diodes launches active OR'ing controller chip
Diodes Incorporated
OR'ing controller chip
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 heat dissipated by the Schottky blocking diodes - traditionally used to protect a load from faulty power supplies - is high, relating directly to its 0.5V forward voltage drop.
Replacing the diodes with low on-resistance Mosfets, with typical forward voltages of under 100mV, means power dissipation is reduced.
The ZXGD3102 is therefore purpose-designed to control Mosfets in high-reliability N+1 redundant power systems.
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 is 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 5-15V low-current bias rail, which is easily derived using a miniature zener diode.
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