Microchip Technology Inc.

Chandler, United States

Microchip Technology Inc.

Chandler, United States
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Patent
Microchip Technology Inc. | Date: 2017-04-26

A circuit and method are provided detecting a persistent short circuit in a power MOSFET for the purpose of protecting a load from over-current. The method determining a fault condition in a circuit comprising a switch provided with a gate, a first terminal and a second terminal, the first terminal being coupled to a load and the second terminal being coupled to a current sense element, and after a blanking delay, comparing a voltage at the current sense element with a reference voltage and asserting a signal indicating a fault condition if the voltage at the current sense element exceeds the reference voltage.


Patent
Microchip Technology Inc. | Date: 2017-05-03

A sequential linear light emitting diode (LED) driver utilizing a headroom control technique is disclosed. A headroom control circuit with a micro-tapped segment of LEDs causes one or more of said LEDs to emit light before the direct current voltage is sufficiently high to cause the main LED string(s) to emit light.


A comparator sense input is disconnected from a current sense resistor for the duration of a switching transition in an adjacent channel(s). Instead, the sense input receives a signal of the magnitude and the slew rate sampled prior to the transition.


Patent
Microchip Technology Inc. | Date: 2017-02-08

Employed within an LED driver (600) operating from the AC power line (120), the invention controls both input current and output power. With the regulation circuit (610, 620) desribed, input current appears purely resistive, precisely tracking the input voltage waveshape. At the same time, it provides good line regulation and inherent phase dimmer compatibility, requiring no special circuitry to detect and handle a dimmer.


Patent
Microchip Technology Inc. | Date: 2017-02-20

Employed within an LED driver operating from the AC power line, the invention controls both input current and output power. With this regulation circuit, input current appears purely resistive, precisely tracking the input voltage waveshape. At the same time, it provides good line regulation and inherent phase dimmer compatibility, requiring no special circuitry to detect and handle a dimmer.


Patent
Microchip Technology Inc. | Date: 2016-09-14

An improved analog switch for use in an ultrasound elastography probe is disclosed. The improved analog switch results in less heat dissipation compared to prior art analog switches.


Patent
Microchip Technology Inc. | Date: 2015-12-30

The invention relates to methods for supplying current to an auxiliary power supply, where the auxiliary supply is connected in parallel to a first switch of a switching regulator and the parallel connection of the auxiliary supply comprises a diode and a second switch.


Patent
Microchip Technology Inc. | Date: 2016-06-08

A controller has an interface, a buffer memory, a first set of registers for accessing the buffer memory, a second set of registers independent from the first set of registers for accessing the buffer memory, and a control unit for decoding and executing buffer memory access commands received by the interface to access the buffer memory through either the first or second set of registers.


Patent
Microchip Technology Inc. | Date: 2015-06-23

A sequential linear light emitting diode (LED) driver utilizing a headroom control technique is disclosed.


Patent
Microchip Technology Inc. | Date: 2015-06-23

A sequential linear light emitting diode (LED) system with a low output ripple is disclosed. In one embodiment, the a sequential linear LED system comprises a bridge rectifier for generating a DC voltage, a diode for receiving the DC voltage, a capacitor coupled to the diode, a current regulator coupled to the capacitor for controlling the charging of the capacitor, and a plurality of segments coupled to the diode, each segment comprising an LED string and current regulator.

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