CURRENT SLOPE CONTROL METHOD AND APPARTUS FOR POWER DRIVER CIRCUIT APPLICATION

摘要

A low side driver includes a first transistor coupled in series with a second transistor at a low side voltage node for a load. A capacitance is configured to store a voltage and a voltage buffer circuit has an input coupled to receive the voltage stored by the capacitance and an output coupled to drive a control node of the second transistor with the stored voltage. A current source supplies current through a switch to the capacitance and the input of the voltage buffer circuit. The switch is configured to be actuated by an oscillating enable signal so as to cyclically source current from the current source to the capacitance and cause a stepped increase in the stored voltage which is applied by the buffer circuit to the control node of the second transistor.

主权项

1. A circuit, comprising:
a driver circuit including a first transistor coupled in series with a second transistor at a voltage node, said voltage node configured to be coupled to a load; a capacitor configured to store a voltage; a voltage buffer circuit having an input coupled to receive the voltage stored by the capacitor and an output coupled to drive a control node of the second transistor with said stored voltage; and a sense circuit configured to sense a threshold voltage of the second transistor and store said sensed threshold voltage as an initial value of the voltage stored in said capacitor.