公开(公告)号：US09621149B2

公开(公告)日：2017-04-11

申请号：US14817107

申请日：2015-08-03

Applicant: Microchip Technology Inc.

Inventor： Benedict C. K. Choy ,  James T. Walker ,  Ming-Yuan Yeh

IPC: H03K17/16 ,  H03K17/06

CPC classification number: H03K17/063 ,  H03K17/163

Abstract: Systems and methods are disclosed for operating a highly linearized resistance for a switch through use of a bootstrapped features. In one exemplary implementation, there is provided a method and system that implements a method for operating a circuit configured to provide a highly linearized resistance including receiving a signal via a bootstrapped switch, coupling the received signal to a gate if the received signal is high, receiving a signal via a switch control input coupled to a high impedance element. Moreover, the method includes coupling the high impedance element to the gate and turning off the switch via a gate turn off when the gate turn off pulls the gate low.

公开(公告)号：US09265103B2

公开(公告)日：2016-02-16

申请号：US14680010

申请日：2015-04-06

Applicant: Microchip Technology Inc.

Inventor： Scott Lynch ,  Benedict C. K. Choy

IPC: H05B33/08

CPC classification number: H05B33/0812 ,  H05B33/0815 ,  H05B33/0818 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/0845 ,  Y02B20/347

Abstract: An LED driver circuit for controlling direct current supplied to a plurality of serially connected segments of Light Emitting Diodes (LEDs) is disclosed. In one embodiment, the LED driver circuit comprises a self-commutating circuit, which comprises a plurality of current control elements, each current control element having two ends, a first end connected to a different end of each segment along the plurality of serially connected segments of LEDs and a second end connected to a path to ground. The path to ground comprises a sense resistor and the path to ground is shared by the second end of each current control element. Each current control element is coupled to an adjacent current control element by a cross-regulation circuit and controlled by a signal from an adjacent current control element.