Clipping prevention in switched mode drivers

A driver apparatus for driving a transducer with an output signal based on an input signal comprising:

• a switching driver comprising:
• first and second input nodes for receiving first and second supply voltages defining an input voltage;
• first and second output nodes for connection to the transducer;
• a switch network;
• and
• a modulator configured to receive the input signal and a feedback signal indicative of the output signal and control the switch network so as to switch said one or both of the first and second output nodes between different switching voltages with a controlled duty-cycle, wherein the modulator comprises a quantizer controller configured to receive a quantizer input signal based on the input signal and the feedback signal and to output switch control signals for controlling the duty-cycle of one or more switches of the switch network;
• wherein the driver apparatus further comprising a clipping prevention controller configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping of the output signal, wherein the clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of said quantizer input signal.