METHOD AND APPARATUS FOR PROGRAMMING A POWER CONVERTER CONTROLLER WITH AN EXTERNAL PROGRAMMING TERMINAL HAVING MULTIPLE FUNCTIONS
First Claim
1. A controller for use in a power converter, comprising:
- a control circuit coupled to receive a feedback signal representative of an output of the power converter, the control circuit coupled to control a switching of a power switch of the power converter in response to the feedback signal to control a transfer of energy from an input of the power converter to the output of the power converter;
an internal programming interface circuit coupled to the control circuit;
a coupling switcher coupled to the internal programming interface circuit;
an external programming terminal selectively coupled to the internal programming interface circuit through the coupling switcher, wherein an external programming circuit coupled to the external programming terminal is coupled to the internal programming interface circuit through the coupling switcher during a startup programming condition and during a fault condition of the power converter, wherein the external programming circuit coupled to the external programming terminal is decoupled from the internal programming interface circuit by the coupling switcher during a normal operating condition of the power converter.
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Accused Products
Abstract
A power converter controller is disclosed. An example controller includes a control circuit coupled to receive a feedback signal representative of an output of the power converter. The control circuit coupled to control a switching of a power switch of the power converter in response to the feedback signal to control a transfer of energy from an input of the power converter to the output of the power converter. An internal programming interface circuit is coupled to the control circuit. A coupling switcher is coupled to the internal programming interface circuit. An external programming terminal is selectively coupled to the internal programming interface circuit through the coupling switcher. An external programming circuit coupled to the external programming terminal is coupled to the internal programming interface circuit through the coupling switcher during a startup programming condition and during a fault condition of the power converter. The external programming circuit that is coupled to the external programming terminal is decoupled from the internal programming interface circuit by the coupling switcher during a normal operating condition of the power converter.
84 Citations
31 Claims
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1. A controller for use in a power converter, comprising:
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a control circuit coupled to receive a feedback signal representative of an output of the power converter, the control circuit coupled to control a switching of a power switch of the power converter in response to the feedback signal to control a transfer of energy from an input of the power converter to the output of the power converter; an internal programming interface circuit coupled to the control circuit; a coupling switcher coupled to the internal programming interface circuit; an external programming terminal selectively coupled to the internal programming interface circuit through the coupling switcher, wherein an external programming circuit coupled to the external programming terminal is coupled to the internal programming interface circuit through the coupling switcher during a startup programming condition and during a fault condition of the power converter, wherein the external programming circuit coupled to the external programming terminal is decoupled from the internal programming interface circuit by the coupling switcher during a normal operating condition of the power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of controlling a power converter, comprising:
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activating a programming current through an external programming terminal of a power converter controller coupled to an external programming circuit during a startup programming condition of the power converter controller; selecting a programmable characteristic of the power converter controller in response to the programming current through the external programming terminal of the power converter controller, wherein the programmable characteristic of the power converter controller is selected in response to programming resistance included in the programming circuit; deactivating the programming current through the external programming terminal after the startup programming condition of the power converter controller such that substantially no power is consumed through external programming terminal during a normal operating condition of the power converter; and activating and deactivating an application of a charging current through the external programming terminal of the power converter controller and through the external programming circuit during a fault condition of the power converter controller, wherein a delay time provided by the activating and deactivating of the application of the charging current is responsive to an RC time constant of the programming circuit. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification