Control integrated circuit for a power transistor of a switching current regulator

Patent metadata

Field	Value
Publication number	US-9077253-B2
Application number	US-201213689422-A
Country	US
Kind code	B2
Filing date	Nov 29, 2012
Priority date	May 31, 2010
Publication date	Jul 7, 2015
Grant date	Jul 7, 2015

Abstract

An integrated circuit controls a switch of a switching current regulator. The current regulator includes primary and secondary windings where a first and a second current flow, respectively. The switch is adapted to initiate or interrupt the circulation of the first current in the primary winding. The control integrated circuit includes a comparator configured to compare a first signal representative of the first current to a second signal and a divider circuit configured to generate the second signal as a ratio of a third signal, proportional to a voltage on the primary winding, with a voltage on a capacitor. The capacitor is charged by a further current controlled by the third signal when the second current is different from zero. The capacitor is discharged through a parallel-connected resistor when the value of said second current is substantially zero.

First claim

The invention claimed is:

1. A control circuit for controlling a first switch of a switching current regulator, said control circuit comprising:
a comparator configured to compare a first signal, representative of a first current through a primary winding of the switching current regulator, with a second signal;
a charge/discharge circuit configured to selectively charge and discharge a capacitor; and
a divider circuit configured to generate said second signal as a ratio of a…

Assignees

• St Microelectronics Srl

Inventors

• Adragna Claudio

Classifications

• H02M7/2176

  Electricity · mapped topic

• H02M3/3353 Primary

  Electricity · mapped topic

• H02M3/33507 Primary

  Electricity · mapped topic

• H02M2001/0022

  Electricity · mapped topic

• H02M3/33523

  Electricity · mapped topic