Method and apparatus providing a multi-function terminal for...

Details Method and apparatus providing a multi-function terminal for... Method and apparatus providing a multi-function terminal for...

2005-07-05

2005-07-05

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S016000, C323S299000

Reexamination Certificate

active

06914793

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.

REFERENCES:
patent: 5313381 (1994-05-01), Balakrishnan
patent: 5708402 (1998-01-01), Hachisu et al.
patent: 5784232 (1998-07-01), Farr
patent: 5949661 (1999-09-01), Minkkinen
patent: 6396718 (2002-05-01), Ng et al.

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