Method and apparatus providing a multi-function terminal for a power supply controller
First Claim
1. A method for controlling a power supply, comprising:
- receiving a first current representative of an input voltage to the power supply through a first terminal of a power supply controller;
activating an over-voltage signal if the first current rises above a first over-voltage threshold value;
deactivating the over-voltage signal if the first current falls below a second over-voltage threshold value;
activating the power supply in response to said deactivated over-voltage signal; and
deactivating the power supply in response to said activated over-voltage signal.
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Accused Products
Abstract
A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle adjustment. The operation of the multi-function terminal varies depending on whether a positive or negative current flows through the multi-function terminal. A short-circuit to ground from the multi-function terminal enables the power supply controller. A short-circuit to a supply voltage from the multi-function terminal disables the power supply controller. The current limit of an internal power switch of the power supply controller may be adjusted by externally setting a negative current from the multi-function terminal. The multi-function terminal may also be coupled to the input DC line voltage of the power supply through a resistance to detect an under-voltage condition, an over-voltage condition and/or adjust the maximum duty cycle of power supply controller. Synchronization of the oscillator of the power supply controller may also be realized by switching the multi-function terminal to power or ground at the desired times.
68 Citations
8 Claims
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1. A method for controlling a power supply, comprising:
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receiving a first current representative of an input voltage to the power supply through a first terminal of a power supply controller;
activating an over-voltage signal if the first current rises above a first over-voltage threshold value;
deactivating the over-voltage signal if the first current falls below a second over-voltage threshold value;
activating the power supply in response to said deactivated over-voltage signal; and
deactivating the power supply in response to said activated over-voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification