Digital control apparatus for a switching DC-DC converter
AssigneeSTMicroelectronics S.r.l.
InventorsFilippo Marino, Marco Minieri, Pietro Costanza
Life of this patent
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Abstract
A digital control apparatus for a switching DC-DC converter includes at least one power transistor and is able to provide a regulated output voltage on a load. The apparatus includes digital control having a reference digital input signal and provides a modulating signal to a PWM device to which is input the modulating signal and which provides an output square wave signal for driving the power transistor of the DC-DC converter such that there is non-linear modulation only when the value of a signal on the load is lower or higher than a prefixed value range.
Claims20
A digital control apparatus for a switching DC-DC converter including at least one power transistor and being able to provide a regulated output voltage on a load, said apparatus comprising:
- digital control means for receiving a digital reference signal and for providing a modulating signal;
- and
- a PWM device for receiving said modulating signal and providing a square wave signal for driving the power transistor of said DC-DC converter, wherein said digital means operates on the PWM device to discontinuously modify the value of the duty cycle of the square wave signal only when the value of a signal on the load is lower or higher than a prefixed value range.
A digitally controlled DC-DC converter comprising:
- a summer for receiving a reference signal;
- a digital control block coupled to said summer;
- a DAC coupled to said digital control block;
- a PWM circuit coupled to said DAC;
- a DC-DC converter coupled to said PWM circuit, having an output for providing an output signal to a load;
- and
- feedback means for providing said output signal to said summer, wherein said PWM circuit provides a square wave signal having a discontinuously modified duty cycle value only when the value of a signal on the load is lower or higher than a predetermined value range.
Dependencies are inferred from the claim text.