Patent ID: 9614517
Date: 2017-04-04
CPC Classifications: H03K

Claim:
1. A driver with adaptive slew rate control (adaptive driver), comprising: a gate driver including at least one driving transistor for driving a control node of at least one switching transistor within an output stage that includes an output node (OUT) which provides a voltage output (Vout); an adjustable current source in series with said driving transistor; a high pass filter (HPF) coupled between said OUT and a ground for detecting a slew rate of said switching transistor by outputting a voltage pulse (Vslp) at an output of said HPF having a peak voltage amplitude at least monotonically reflecting a slope of Vout during its switching transition; detection signal processing circuitry coupled to said output of said HPF for processing said Vslp and outputting a processed detection signal; slew rate control circuitry having an input coupled to said output of said detection signal processing circuitry for receiving said processed detection signal, wherein an output of said slew rate control circuitry is coupled to said adjustable current source for controlling a level of current of said adjustable current source (current level), said current level for changing said slew rate of said switching transistor; further comprising a peak detector coupled to receive said Vslp and provide a peak detector output (PDO), a first comparator for comparing a low vref level to said PDO and a second comparator for comparing a high vref level to said PDO, wherein outputs of said first and second comparator are coupled to said input of said slew rate control circuitry.