Patent ID: 8957724
Filing Date: 2015-02-17
Classification: G05F

Abstract:
1. Circuitry for controlling a power transistor of a drive circuit arranged to drive an electrical component, the circuitry comprising: a variable current source configured to set a level of a charging current for charging a control terminal of said power transistor; a control circuit configured to control said variable current source with a non-discrete, continuous first control signal based on a feedback voltage, wherein said variable current source is configured to set, based on the first control signal, both the level of said current for charging said control terminal of said power transistor and a level of a current for discharging said control terminal of said power transistor; a first current mirror arranged to supply said charging current for charging said control terminal of said power transistor based on the current through said variable current source; a second current mirror arranged to supply said discharging current for discharging said control terminal of said power transistor based on the current through said variable current source; a first switch configured to supply the charging current from the first current mirror to the control terminal of said power transistor in response to a second control signal having a first level; and a second switch configured to supply the discharging current from the control terminal of said power transistor to the second current mirror in response to the second control signal having a second level.