Apparatus and method for hysteretic boost DC-DC converter
First Claim
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1. A circuit for regulation, comprising:
- boost converter circuitry, including;
a hysteretic comparator having at least a first input, a second input, and an output, wherein the first input of the hysteretic comparator is coupled to an output node;
a power switch that is coupled between a switch node and another node; and
a resistive device that is coupled to said another node, wherein the boost converter circuitry is arranged to operate with an output capacitor coupled between the output node and said another node, the resistive device is arranged to provide a portion of an output voltage at the output node, and wherein the resistive device has a resistance that is sufficiently large that an output voltage ripple of the output voltage is out of phase with an output capacitor voltage ripple of a voltage across the output capacitor.
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Abstract
A boost hysteretic DC-DC converter is provided. The converter includes a power switch, a hysteretic comparator, an inductor, an output capacitor, and a resistive device. The resistive device is coupled to the bottom of the output capacitor, so that the output voltage is equal to the sum of the capacitor voltage and the voltage across the resistive device. The resistance of the resistance device is sufficiently large that the output voltage ripple is in phase with the inductor current.
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20 Claims
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1. A circuit for regulation, comprising:
boost converter circuitry, including; a hysteretic comparator having at least a first input, a second input, and an output, wherein the first input of the hysteretic comparator is coupled to an output node; a power switch that is coupled between a switch node and another node; and a resistive device that is coupled to said another node, wherein the boost converter circuitry is arranged to operate with an output capacitor coupled between the output node and said another node, the resistive device is arranged to provide a portion of an output voltage at the output node, and wherein the resistive device has a resistance that is sufficiently large that an output voltage ripple of the output voltage is out of phase with an output capacitor voltage ripple of a voltage across the output capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A circuit for regulation, comprising:
a boost converter, including; a hysteretic comparator having at least a first input that is coupled to a first node, a second input that is coupled to a second node, and an output that is coupled to a third node; a capacitor that is coupled between the first node and the fourth node; a resistive device that is coupled between the fourth node and a fifth node, such that a voltage drop because between the first node and the fifth node includes a sum of a voltage across the capacitor and a voltage across the resistive device; and a power transistor having at least a gate that is coupled to the third node, a source that is coupled to the fourth node, and a drain that is coupled to a sixth node. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for regulation, comprising:
converting an input voltage at an input node into an output voltage at an output node that is greater than the input voltage, including; comparing the output voltage with a reference voltage, such that the comparison includes hysteresis; employing a result of the comparison to selectively transfer energy from an inductor that is coupled to the input node to an output capacitor that is coupled to the output node; and adding a ramp to the output voltage such that the output voltage ripple is out of phase with an output capacitor ripple of a voltage across the output capacitor, and such that an output ripple of the output voltage is substantially proportional to an inductor current that is associated with the inductor. - View Dependent Claims (18, 19, 20)
Specification