Patent ID: 6137276
Filing Date: 2000-10-24
Classification: G05F

Abstract:
A telecom power supply for accepting a variable DC input line voltage and providing a regulated output voltage with low quiescent current draw, comprising:a conductance device having an input receiving the variable DC input line voltage, a control input and an output and for providing an output current;a serial circuit including a resistor serially connected to a reference diode at a reference voltage node, the serial circuit having the resistor connected to the output of the conductance device and the reference diode connected to a reference potential, and the reference node being connected to the control input of the conductance device to control a conductance thereof based on the potential across said resistor; anda voltage regulating circuit having an input coupled to the output of the conductance device to receive current therefrom, a reference input connected to the reference potential, and an output for providing a substantially regulated output voltage.