Diode bridge controller reduces power dissipation, increases voltage
A diode bridge controller for 9 to 72V systems replaces each of the four diodes in a full wave bridge rectifier with a low loss n-channel mosfet to reduce power dissipation and increase available voltage.
Devloped by Linear Technology, the LT4320 enables space and power efficient rectifier designs. The controller operates from dc to 600Hz, turning on the appropriate two mosfets, while keeping the other two off to prevent reverse currents. An integrated charge pump provides the gate drive for the external low on resistance n-channel mosfets without requiring external capacitors. The choice of mosfets offers the greatest flexibility in power levels ranging from one to thousands of watts.
The LT4320 is available in two options: the LT4320 is designed for dc to 60Hz voltage rectification, while the LT4320-1 rectifies dc to 600Hz. Specified for use in temperatures ranging from -40 to 85oC, the LT4320 is supplied in an 8pin dfn package measuring 3 x 3mm or a 12lead msop with enhanced high voltage pin spacing.
