公开(公告)号：US20190196524A1

公开(公告)日：2019-06-27

申请号：US15966997

申请日：2018-04-30

Applicant: Texas Instruments Incorporated

Inventor： Zhenghao CUI ,  Yadan SHEN

IPC: G05F1/575 ,  H03G5/28 ,  H03F1/34 ,  G01R19/00

Abstract: Regulating voltages at inputs of an electronic device by performing at least the following: receiving, at a voltage monitoring circuit, a monitoring voltage corresponding to a power system, determining, at the voltage monitoring circuit, whether the monitoring voltage is equal to or exceeds a monitoring threshold voltage, receiving, at the voltage monitoring circuit, an output indicating whether an inputted reference voltage and an inputted feedback voltage at a comparator circuit differs, regulating, at the voltage monitoring circuit, a feedback voltage to match the inputted reference voltage based on the output and a determination that the monitoring voltage is equal to or exceeds the monitoring threshold voltage, and providing, from the voltage monitoring circuit, the feedback voltage as an updated inputted feedback voltage for the comparator circuit.

公开(公告)号：US20180181151A1

公开(公告)日：2018-06-28

申请号：US15588089

申请日：2017-05-05

Applicant: Texas Instruments Incorporated

Inventor： Alvin XU ,  Qingjie MA ,  Yang WANG ,  Yan HE ,  Jun MA ,  Zhenghao CUI ,  Jingwei XU

IPC: G05F1/56

CPC classification number: G05F1/56 ,  G05F1/567 ,  G05F3/30

Abstract: Methods, apparatus, systems and articles of manufacture for negative output voltage active clamping using a floating bandgap reference and temperature compensation are disclosed. An example load switch includes a floating bandgap reference circuit to generate a bandgap reference voltage. A resistor divider is to generate a resistor divider voltage. A temperature compensator to apply a temperature compensation current to the resistor divider to create a temperature compensated resistor divider voltage. A power transistor is to be enabled when the temperature compensated resistor divider voltage is less than the bandgap reference voltage. The example load switch can work under negative output voltage clamping and get better accuracy drain to source clamped voltage of power transistor for inductive load condition.