MULTIPHASE DC-TO-DC SWITCHING POWER CONVERTER WITH LEADING EDGE AND CROSS CHANNEL BLANKING

摘要

A multiphase DC-to-DC synchronous power converter, which has a number of converter channels that generate a corresponding number of current sense signals, blanks the current sense signals in a first converter channel for periods of time that correspond with the actions of the transistors in a second converter channel, where the actions result in noise spikes across the converter that falsely interfere with current sensing in the first converter channel.

主权项

1. A power converter comprising:
a first MOS transistor; a second MOS transistor connected to the first MOS transistor; a third MOS transistor; a fourth MOS transistor connected to the third MOS transistor; a first current sense circuit connected to the second MOS transistor, the first current sense circuit to sense a current that flows through the second MOS transistor, and output a first current sense signal in response; a first blanking circuit connected to the first current sense circuit, the first blanking circuit to blank the first current sense signal for a first cross blanking period of time in response to a first cross blanking pulse of a plurality of first blanking pulses, the first cross blanking period of time to begin before the fourth MOS transistor turns off and end after the third MOS transistor turns on; a controller connected to the first, second, third, and fourth MOS transistors and the first blanking circuit, the controller to output the plurality of first blanking pulses.