Transient response of a switching converter
AssigneeShaoxing Yuanfang Semiconductor Co., Ltd.
InventorsRamasiddaiah Pamidi, Shyam Somayajula, Ramkishore Ganti
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Abstract
A transient handling module (of a switching converter) containing a first circuit portion designed to handle an undershoot of the regulated supply voltage and a second circuit portion designed to handle an overshoot of the regulated supply voltage. Each circuit portion contains a respective capacitor pre-charged to a respective pre-determined voltage and a respective switch coupled between the capacitor and the output node. The capacitor in the first circuit portion is operable to supply current to the output node via the switch upon occurrence of an undershoot. The capacitor in the second circuit portion is operable to draw current from the output node via the switch upon occurrence of an overshoot.
Claims20
A switching converter comprising:
- a high-side switch and a low-side switch coupled in series at a switching node, and together operable to provide a regulated output voltage at an output node based on an input voltage received at an input node;
- and
- a transient handling module comprising a first circuit portion designed to handle an undershoot of said regulated output voltage, said first circuit portion comprising:
- a first capacitor having a first terminal and a second terminal, said first terminal of said first capacitor being coupled to a constant reference potential;
- a first switch coupled between said input node and said second terminal of said first capacitor;
- and
- a second switch coupled between second terminal of said first capacitor and said output node,
- wherein in a first time duration, said first switch is closed with said second switch being open such that said first capacitor is charged to a first voltage via said first switch,
- wherein upon occurrence of said undershoot of said regulated output voltage following said first time duration, said second switch is closed for a second time duration with said first switch being open in said second time duration such that said output node is coupled to said first capacitor via said second switch to cause said first capacitor to supply current to said output node.
A voltage regulator module (VRM) comprising:
- a power stage comprising a high-side switch and a low-side switch coupled in series at a switching node, and together operable to provide a regulated supply voltage of a desired magnitude at an output node based on an input voltage received at an input node;
- and
- a transient handling module comprising a first circuit portion designed to handle an overshoot of said regulated output voltage, said first circuit portion comprising:
- a first capacitor having a first terminal and a second terminal, said first terminal being coupled to a constant reference potential;
- a first switch coupled between said constant reference potential and said second terminal of said first capacitor;
- and
- a second switch coupled between said second terminal of said first capacitor and said output node,
- wherein in a first time duration, said first switch is closed with said second switch being open such that said first capacitor is discharged to a first voltage via said first switch,
- wherein upon occurrence of said overshoot of said regulated output voltage following said first time duration, said second switch is closed for a second time duration with said first switch being open in said second time duration such that said output node is coupled to said first capacitor via said second switch to cause said first capacitor to draw current from said output node.
Dependencies are inferred from the claim text.