Patent ID: 9438228
Filing Date: 2016-09-06
CPC Classification: H03K

Claim Text:
1. A gate drive circuit for a power transistor, comprising: a power transistor having a control node; a current control circuit operable, during turn on of the power transistor, to source a gate drive current to a control node of the power transistor and, during turn off of the power transistor, to sink a gate drive current from the control node of the power transistor; a first secondary current source distinct from the current control circuit and coupled directly to the control node, the first secondary current source is configured to receive a first control signal and adjust the gate drive current, during turn off of the power transistor, in accordance with the first control signal, the first control signal being indicative of a rate of change of current passing through the power transistor; and a second secondary current source distinct from the current control circuit and coupled directly to the control node, the second secondary current source is configured to receive a second control signal and adjust the gate drive current, during turn on of the power transistor, in accordance with the second control signal, the second control signal being indicative of a rate of change of current passing through the power transistor.