Low-loss 3-phase ideal diode bridge rectifier operated by evaluation board DC2465

Linear Technology Korea (CEO Hong Sa-kwak) announced a low-loss 3-phase ideal diode bridge rectifier reference design operated by evaluation board DC2465.

Conventional three-phase rectifiers use six diodes that step down the voltage and dissipate significant power with only a few amperes of load current. This necessitates expensive heat sinks and active cooling solutions, complicating the thermal design and increasing the solution size.

However, the DC2465 design replaces six diodes with three LT4320 ideal diode bridge controllers while driving six low-loss N-channel MOSFETs, significantly reducing power and voltage losses. This feature improves power efficiency, allowing the overall system to be designed to operate with smaller, more cost-effective power supplies. For low-voltage applications, it provides the benefit of additional voltage margin by eliminating the two diode drops caused by the diode bridge. Compared to conventional approaches, the MOSFET bridge enables a very space-efficient and power-efficient rectifier design.


The DC2465 board rectifies line-to-line AC voltages ranging from 9 VRMS to 48 VRMS at frequencies up to 400 Hz, sourcing loads up to 25 A without forced airflow. At 9 V input, efficiency is 84% for the diode bridge, but the active bridge increases efficiency to 97%.

The DC2465 evaluation board is available now, priced at $125 each. The LT4320 ideal diode bridge controller IC is available in 8-pin MSOP, PDIP, and 3mm x 3mm DFN packages. Evaluation circuit boards are available online or from your local Linear Technology sales office.