Controller for sensing a heavy load and a short circuit of...

Details Controller for sensing a heavy load and a short circuit of... Controller for sensing a heavy load and a short circuit of...

2006-12-10

2009-06-09

Sterrett, Jeffrey L (Department: 4116)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S901000

Reexamination Certificate

active

07545126

ABSTRACT:
A method capable of sensing a heavy load and a short circuit of a low dropout regulator includes providing a ramp pulse signal to the low dropout regulator, providing a square waveform, comparing a feedback signal of the low dropout regulator with the square waveform, and determining the low dropout regulator is a heavy load or a short circuit if a duration that the feedback signal is greater than a low voltage level of the square waveform and lower than a high voltage level of the square waveform is not greater than a pulse width of the square waveform. The method includes determining the low dropout regulator is a light load if the duration that the feedback signal is greater than the low voltage level of the square waveform and lower than the high voltage level of the square waveform is greater than the pulse width of the square waveform.

REFERENCES:
patent: 5898554 (1999-04-01), Schnetzka et al.
patent: 6252409 (2001-06-01), Iijima
patent: 463950 (2001-11-01), None
patent: I254135 (2006-05-01), None

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