| 摘要 |
When a drive signal that is a PWM input signal is small (when the drive duty component of the PWM drive signal is small), shoot-through (through state) between the upper transistor and lower transistor can occur when there is variation in the drive circuit or transistors. An upper switching device and lower switching device control current supply to a load, and an upper drive circuit and lower drive circuit respectively drive the upper switching device and lower switching device. The upper drive circuit has an input terminal that receives a control signal that turns the upper switching device on or off; an upper source circuit that SOURCE outputs a drive current to the control terminal of the upper switching device according to a first level or second level signal applied to the input terminal; an upper sink circuit that SINK outputs drive current to the control terminal of the upper switching device according to a second level or first level signal applied to the input terminal; an upper sink transistor that sinks capacitive current through the control terminal when the upper switching device is off; an upper interface circuit that generates a first input drive signal to the upper source circuit according to the input terminal signal, and a second input drive signal to the upper sink circuit or the upper sink transistor; and a selector that selectively supplies the second input drive signal to the upper sink circuit or the upper sink transistor based on a signal from the inverter. The lower drive circuit is identically configured. |
