In addition, as a type, Class D output stages are highly dependent on stable internal voltage rails, and can suffer impaired performance on marginal or unstable AC line supplies.
Enter DriveCore, initially developed with Texas Instruments for our I-Tech HD Series, which, when you think about it, acts as a “brain” for the amplifier.
This proprietary hybrid analog-digital integrated circuit (IC) drives the “front end” of the Class D output stage, which was placed in the signal chain between the DSP module and the main power output devices.
Driven fully balanced from the D-to-A converter stage, DriveCore incorporates highly refined feedback circuits and a single synchronous clock.
Further, we deployed some of our proprietary circuit-modeling techniques to optimize the relationship between the new modulator chip and the power output stage.
Applying our latest developments in power FET semiconductor technology, along with an advanced differential drive circuit topology, means that the XLS Series can deliver the efficiency of Class D but with the lower distortion and residual noise typical of Class AB designs.
Feedback and PWM modulation circuits enable fast recovery on peak transients, accurate reproduction of low-level detail, and precise tracking of low frequencies at high power levels for maximum subwoofer output.
DriveCore also integrates thermal management and protection systems that make sure maximum power is delivered to the load with minimum stress on output devices.
This power supply design is coupled with a wide-tolerance PWM clock in DriveCore that maintains full performance even with sagging or “dirty” AC line conditions.
A new, proprietary “modulator chip” in DriveCore can handle large (up to 3:1) variations in power supply noise or sag without adversely affecting audio quality.
Consequently, performance is far less likely to be compromised by fluctuating generator power or by AC circuits sagging from marginal overloading by lighting rigs, backline gear, etc.
The Class D output stage substantially reduces weight compared to older, 60 Hz transformer-based power supplies, with the microchip eliminating numerous components and also lowering weight.