A switching driver capable of reducing EMI effect and power ripple, coupled to a load through an output end, and the switching driver comprising:
- a non-overlapping signal generator, configured for generating a high-side signal and a low-side signal according to a pulse width control signal;
- a high-side switch, coupled between a power end and the output end, and having a high-side control end;
- a high-side auxiliary switch, connected in parallel to the high-side switch, and having a high-side auxiliary control end;
- a low-side switch, coupled between the output end and a ground end, and having a low-side control end;
- a low-side auxiliary switch, connected in parallel to the low-side switch, and having a low-side auxiliary control end;
- a high-side driver, coupled among the non-overlapping signal generator, the power end, the high-side control end, and the high-side auxiliary control end;
- and
- a low-side driver, coupled among the non-overlapping signal generator, the output end, the low-side control end, and the low-side auxiliary control end;
- wherein when the pulse width control signal is low level, the high-side driver turns off the high-side switch and the high-side auxiliary switch according to the high-side signal, the low-side driver turns on the low-side switch and the low-side auxiliary switch according to the low-side signal;
- wherein when the pulse width control signal is converted from the low level to a high level, the high-side driver turns off the high-side switch and the high-side auxiliary switch for a dead-time, and simultaneously turns on the high-side switch and the high-side auxiliary switch after the dead-time according to the high-side signal, the low-side driver decreases the voltage of the low-side control end to less than a turn-on voltage to turn off the low-side switch according to the low-side signal, and detects an ascending slope of the voltage of the output end to control a cut-off velocity of the low-side auxiliary switch, and as the ascending slope becomes higher, the cut-off velocity of the low-side auxiliary switch becomes slower;
- wherein the low-side driver comprises:
- a first capacitor, coupled between the output end and the low-side auxiliary control end;
- a first low impedance element, coupled among a low-side high-voltage end, the low-side control end, and the ground end, and configured for controlling the low-side control end connected to the low-side high-voltage end or connected to the ground end according to the low-side signal;
- a first high impedance element, coupled between the low-side auxiliary control end and the ground end, and configured for controlling the low-side auxiliary control end connected to the ground end according to the low-side signal;
- and
- a first short switch, coupled between the low-side control end and the low-side auxiliary control end, and configured for adjusting the voltage of the low-side control end and the voltage of the low-side auxiliary control end according to the low-side signal;
- wherein when the pulse width control signal is converted from the low level to the high level, the first low impedance element connects to the ground end and the low-side control end, to decrease the voltage of the low-side control end to a low voltage, the first high impedance element connects to the ground end and the low-side auxiliary control end, to decrease the voltage of the low-side auxiliary control end according to the ascending slope of the voltage of the output end detected from the first capacitor;
- wherein when the pulse width control signal is converted from the high level to the low level, the first short switch is turned off for the dead-time and then turned on, to simultaneously raise the voltage of the low-side control end and the voltage of the low-side auxiliary control end.