Power stage control circuit
AssigneeRichpower Microelectronics Corporation
InventorsYu-Chang Chen, Pei-Lun Huang, Li-Di Lo
Life of this patent
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Abstract
The present invention discloses a power stage control circuit including: a driver circuit for controlling a power stage according to an error amplified signal; an error amplifier circuit for comparing a feedback voltage at a feedback terminal with a reference signal to generate the error amplified signal; a current generator circuit coupled to the feedback terminal for generating a fault detection current flowing to the feedback terminal; and a feedback terminal short detection circuit for generating a fault signal to stop the operation of the power stage when the feedback voltage is smaller than a short-circuit threshold voltage or when the fault detection current is larger than a short-circuit threshold current.
Claims17
A power stage control circuit controlling a power stage, wherein the power stage is driven by a driver signal to convert an input voltage to an output voltage or an output current, the power stage control circuit comprising:
- a driver circuit for generating the driver signal to drive the power stage according to an error amplified signal;
- an error amplifier circuit for comparing a feedback voltage at a feedback terminal with a reference signal to generate the error amplified signal, wherein the feedback terminal is for electrically connecting to the output voltage through a first resistor and electrically connecting to ground through a second resistor;
- a current generator circuit coupled to the feedback terminal for generating a fault detection current flowing out through the feedback terminal such that when the output voltage is zero or low, the first and second resistors form a parallel circuit between the feedback terminal and the ground;
- and
- a feedback terminal short detection circuit for generating a fault signal when, after the fault detection current is generated, the feedback voltage is smaller than a short-circuit threshold voltage, such that the driver circuit stops driving the power stage.
A power stage control circuit controlling a power stage, wherein the power stage is driven by a driver signal to convert an input voltage to an output voltage or an output current, the power stage control circuit comprising:
- a driver circuit for generating the driver signal to drive the power stage according to an error amplified signal;
- an error amplifier circuit for comparing a feedback voltage at a feedback terminal with a reference signal to generate the error amplified signal, wherein the feedback terminal is for electrically connecting to the output voltage through a first resistor and electrically connecting to ground through a second resistor;
- a current generator circuit coupled to the feedback terminal for generating a fault detection current flowing out through the feedback terminal such that when the output voltage is zero or low, the first and second resistors form a parallel circuit between the feedback terminal and the ground;
- and
- a feedback terminal short detection circuit for generating a fault signal when, after the fault detection current is generated, the fault detection current is larger than a short-circuit threshold current, such that the driver circuit stops driving the power stage.
Dependencies are inferred from the claim text.