Methods and systems for driving a load

1. A circuit to selectively adjust a current for driving a load, comprising:

a sensor configured to measure a magnetic field associated with the current and provide a sensor voltage representative thereof;

a control circuit configured to selectively adjust the current as a function of the sensor voltage and a time-varying voltage threshold; and

a timing circuit, the timing circuit comprising:

an oscillator;

a serial to parallel interface (SPI);

a dither module having an first input coupled to an output of the oscillator and having a second input coupled to the SPI;

an average current block having an input coupled to the SPI; and

a hysteresis block having an input coupled to the SPI.

2. The circuit of claim 1 , further comprising:

a summation element configured to sum signals from the dither module, the average current block, and the hysteresis block to thereby provide the time-varying voltage threshold to the control block.

3. The circuit of claim 2 , further comprising:

a control path coupling the control circuit to the hysteresis block;

wherein the control circuit provides a feedback signal to the hysteresis block via the control path.

4. The circuit of claim 3 , wherein the control circuit comprises:

a selective driver configured to provide both a drive signal and an inverted drive signal as a function of the sensor voltage;

a first device configured to increase the current as a function of the drive signal if the sensor voltage favorably compares to the time-varying voltage threshold; and

a second device configured to decrease the current as a function of the inverted drive signal if the sensor voltage does not favorably compare to the time-varying voltage threshold;

wherein the control path couples the selective driver to the hysteresis block.