Method and apparatus providing final test and trimming for a power supply controller
First Claim
1. A method for providing a power supply controller circuit, comprising:
- toggling a voltage of a signal applied to an external terminal of the power supply controller circuit between a low selection voltage and a high selection voltage to select a first trim circuit of the power supply controller circuit, the external terminal one of a power supply terminal, a control terminal or a function terminal of the power supply controller circuit; and
applying a programming voltage to the external terminal after selecting the first trim circuit to program a first programmable circuit connection of the first trim circuit, wherein the programming voltage is greater than an operating voltage to be applied to the external terminal.
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Accused Products
Abstract
A power supply controller having final test and trim circuitry. In one embodiment, a power supply controller for switched mode power supply includes a selector circuit, a trim circuit, a shutdown circuit and a disable circuit. The trim circuit includes a programmable circuit connection that can be selected by the selector circuit by toggling a voltage on an external terminal such as for example a power supply terminal, a control terminal or a function terminal of the power supply controller. The programmable circuit connection in the trim circuit can be programmed by applying a programming voltage to the external terminal. The shutdown circuit shuts down the power supply controller if the temperature rises above an over temperature threshold voltage. The shutdown circuit includes adjustment circuitry that can be used to test the shutdown circuit. The adjustment circuitry can adjust and reduce the over temperature threshold of the power supply controller. Thus, the power supply controller can be tested without having to actually heat the part. The disable circuit includes a programmable circuit connection, which when programmed prevents further trimming of power supply controller and prevents adjustment of the shutdown circuit over temperature threshold.
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Citations
13 Claims
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1. A method for providing a power supply controller circuit, comprising:
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toggling a voltage of a signal applied to an external terminal of the power supply controller circuit between a low selection voltage and a high selection voltage to select a first trim circuit of the power supply controller circuit, the external terminal one of a power supply terminal, a control terminal or a function terminal of the power supply controller circuit; and
applying a programming voltage to the external terminal after selecting the first trim circuit to program a first programmable circuit connection of the first trim circuit, wherein the programming voltage is greater than an operating voltage to be applied to the external terminal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An integrated circuit, comprising:
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an external terminal, wherein the external terminal is a supply terminal of the integrated circuit, wherein the integrated circuit is configured to operate with a first voltage at the external terminal; and
a trim circuit coupled to the external terminal, the trim circuit including a first programmable circuit connection to be programmed in response to a signal on the external terminal, wherein the signal on the external terminal is to be toggled between a second voltage and a third voltage to select the trim circuit; and
a selector circuit coupled to the external terminal and to the trim circuit, the selector circuit to select the trim circuit to programmed in response to the signal on the external terminal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification