DC-DC converters having improved current sensing and related...

Details DC-DC converters having improved current sensing and related... DC-DC converters having improved current sensing and related...

Filed on

2011-05-03

Date issued

2011-05-03

Examiner

Nguyen, Danny (Department: 2836)

Patent Class

Electricity: electrical systems and devices

SubClass

Safety and protection of systems and devices

SubSubClass

Voltage regulator protective circuits

Other Related Categories

C361S093900

Type

Reexamination Certificate

Status

active

Patent number

07936540

Description

ABSTRACT:
A DC-DC converter includes a chip including an error amplifier, a pulse width modulator (PWM), and an inductor driven by said PWM in series with an output node (VOUT), wherein a load current flows through the inductor. A circuit for sensing the load current includes a first operational amplifier and a sense resistor having resistance RSENSE; wherein a sense current related to the load current flows through the sense resistor. A reference resistor has a resistance RREFERENCEwhich is a fixed multiple of RSENSE. A set resistor has a resistance RSET. Tracking circuitry sets a voltage across the reference resistor to be equal to a voltage across the set resistor. A function block receives a current through the set resistor and a current through the reference resistor to find their ratio. A current multiplier provides a measurement current which is proportional to the load current divided by RSET.

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patent: 6906536 (2005-06-01), Pearce et al.
patent: 7015680 (2006-03-01), Moraveji
patent: 7714561 (2010-05-01), Ge

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