Chandler, United States
Chandler, United States

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Patent
Microchip Technology Inc. | Date: 2015-06-18

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.


Patent
Microchip Technology Inc. | Date: 2015-08-03

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.


A circuit module comprises a die attach pad with a surface and a plurality of leads surrounding the surface. A nonconductive adhesive is on the surface. A plurality of electronic circuit dies are on the surface of the die attach pad. Each die has a top surface and a bottom surface with the bottom surface on the adhesive. The top surface has a plurality of bonding pads. A first electronic circuit die has at least one routing path of a conductive material connecting a first bonding pad to a second bonding pad. A first bonding wire connects a bonding pad of a second electronic circuit die to the first bonding pad of the first electronic die. A second bonding wire connects the second bonding pad of the first electronic circuit die to a lead. Where one of the dies contains vertical circuit element, where a doped layer forms a terminal along the bottom surface of the layer, a trench filled with doped polysilicon extends from the top surface to the terminal to connect to the terminal. The doped polysilicon filled trench also serves to isolate and separate different circuit elements.


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: 2015-04-06

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.


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.


Described herein are multiple designs for an improved analog switch for use in transmitting high voltage signals without using high voltage power supplies for the switch. The analog switches are able to pass and block input signals in the approximate range of 100V to +100V. The use of translinear loops and a bootstrap configuration results in a constant on-resistance of the symmetrical switches and matches the conductance of each analog switch to the transconductance of an NMOS transistor, which can be easily stabilized with a constant g_(m )biasing scheme. In certain embodiments, a shunt termination (T-switch) configuration is used for better off-isolation, and each of the symmetrical switches has its own translinear loop and thus flexibility of on-resistance and termination voltage.

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