Analog/digital PWM control circuit of a winding

A feedback control circuit of the current flowing in a load constituted by a winding in series to a current sensing resistor, comprising

• a full-bridge stage, driven by a pair of control signals first (In+) and second (In−), coupled to the current terminals of said load,
• an amplifier (Sense_Ampl) having a noninverting input and an inverting input respectively coupled to the terminals of said sensing resistor, producing an amplified replica voltage (Vsense) of the voltage drop on said sensing resistor,
• a controller (Controllore) coupled to the output of said amplifier and to a voltage reference from outside (Vin) representing a desired value of the current in the load, producing a correction signal,
• a PWM converter coupled to the output of said controller and to a clock signal (sys_clk), generating said pair of control signals (In+, In−),
• characterized in that said PWM converter comprises
• an up/down counter coupled to said clock signal (sys_clk), producing a count value;
• a logic circuitry coupled to the output of said controller, producing a signal that is the complement to two of said correction signal;
• a pair of registers first (D_In+) and second (D_In−) respectively coupled to the outputs of said controller and of said circuitry;
• a first comparator (comp—1) coupled to the outputs of said counter and of said first register (D_In+), producing said first control signal (In+) if said count value exceeds the value stored in the first register (D_In+);
• a second comparator (comp—2) coupled to the outputs of said counter and of said second register (D_In−), producing said second control signal (In−) if said count value exceeds the value stored in the second register (D_In−).