Patent ID: 6100742
Filing Date: 2000-08-08
Classification: H03K

Abstract:
A driver circuit for controlling current in a load comprising:a switching transistor coupled to the load, the switching transistor having a control terminal;a control circuit coupled to the control terminal of the switching transistor, the control circuit being structured to provide a control signal having leading edges and trailing edges to the control terminal of the switching transistor, wherein the control circuit comprises:an amplifier having an input and an output coupled to the control terminal of the switching transistor;a feedback capacitor coupled between the input of the amplifier and a terminal of the switching transistor; andan input terminal coupled to receive a switch control signal having leading edges and trailing edges; anda current circuit coupled to the control circuit to draw current from the control circuit during each leading edge and each trailing edge of the control signal, wherein the current circuit comprises:a first transistor coupled to the control terminal of the switching transistor, the first transistor having a control terminal coupled to receive a signal to enable the first transistor to draw current from the control terminal of the switching transistor during each leading edge and each trailing edge of the switch control signal;a monostable circuit having an input coupled to the input terminal to receive the switch control signal and an output coupled to the control terminal of the first transistor, the monostable circuit being structured to enable the first transistor during the leading edges and the trailing edges of the switch control signal; anda second transistor having a control terminal coupled to the output of the monostable circuit, a first terminal coupled to the control terminal of the first transistor, and a second terminal coupled to a ground, the second transistor being structured to be disabled by the monostable circuit during the leading edges and the trailing edges of the switch control signal to enable the first transistor.