Patent ID: 7310048
Filing Date: 2007-12-18
Classification: G01R,H02J

Abstract:
1. A current sense circuit, comprising: a current sense resistor coupled to an input of the current sense circuit, the current sense resistor to receive a current to be sensed from the input of the current sense circuit to convert the current to be sensed to a current sense voltage; a first PN junction diode coupled to the current sense resistor; and a light emitting diode (LED) coupled to the first PN junction diode to provide a current sense threshold substantially equal to a difference between a forward voltage drop of the first PN junction diode and a fraction of a forward voltage drop of the LED, the first PN junction diode coupled to be biased from the forward voltage drop of the LED, the LED coupled to the current sense resistor to generate an output when the current sense voltage from the current sense resistor reaches the current sense threshold.