Switching regulator stability control circuit and methodology
AssigneeChaoyang Semiconductor Jiangyin Technology Co., Ltd.
InventorsBertrand Diotte, Mykhaylo Teplechuk
Life of this patent
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Abstract
A power stage output node stabilizer may be used to reduce ringing of a power stage output node of a switching DC-DC power converter. The power stage output node stabilizer may be a network of resistors and switches coupling the power stage output node to a higher voltage level and a lower voltage level.
Claims20
A DC-DC switching power converter with a power stage output node stabilizer, comprising:
- a high side switch and a low side switch coupled in series between a higher voltage and a lower voltage;
- an inductor, with a first end and a second end, the first end coupled to a power output stage node between the high side switch and the low side switch;
- a capacitor coupled to the second end of the inductor, in parallel to a load;
- a plurality of resistive legs coupling the power stage output node and the higher voltage and the lower voltage, each of the resistive legs including a high side portion coupling the power stage output node and the higher voltage and a low side portion coupling the power stage node and the lower voltage, each high side portion of each resistive leg including a first switch for activating that high side portion, and each low side portion of each resistive leg including a second switch for activating that low side portion, each of the high side portions and each of the low side portions having an associated resistance.
A method for reducing ringing of an output node of a power stage of a switching power converter, the switching power converter including a high side switch and a low side switch coupled in series between a higher voltage and a lower voltage and an output filter coupled to a power stage output node, the power stage output node being between the high side switch and the low side switch comprising:
- determining that both the high side switch and the low side switch have been opened;
- closing a first plurality of switches coupling the power stage output node to the higher voltage by way of a first set of resistances and closing a second plurality of switches coupling the power stage output node to the lower voltage by way of a second set of resistances, in response to determining that both the high side switch and the low side switch have been opened;
- and
- progressively opening the first plurality of switches and the second plurality of switches over a predetermined period of time after closing the first plurality of switches and closing the second plurality of switches.
A DC-DC switching power converter with a power stage output node stabilizer, comprising:
- a high side switch and a low side switch coupled in series between a higher voltage and a lower voltage;
- an output filter coupled to a power stage output node, the power stage output node being between the high side switch and the low side switch;
- and
- a first plurality of selectively enabled resistances between the higher voltage and the first node;
- and
- a second plurality of selectively enabled resistances between the lower voltage and the first node.
Dependencies are inferred from the claim text.