Alpha Omega Semiconductor Inc.

Atmel Corporation

Wai-Keung Peter Cheng

Allen Chang

Charles Cai

Son Tran

Zhinan Wei

Kevin Ng

A circuit for controlling a switch in a power converter in which peak current is regulated to achieve a specified average current through a load. Control logic is operable to monitor a voltage across a sensing resistor such that when the voltage across the sensing resistor reaches or exceeds a threshold value, the control logic generates a signal that causes a switch to be turned OFF.

Average current control for a switched power converter

Parallel light emitting diode channels may be controlled using a pulsed control signal input characterized by an input duty cycle and one or more current sense input signals. Each of the one or more current sense input signals is indicative of a current through a corresponding load channel of one or more load channels. One or more pulsed channel current control signals are provided to one or more corresponding dimming controls correspondingly coupled to the one or more load channels. Each of the dimming controls is configured to provide an output signal to a corresponding ON-OFF switch, each of which is coupled in series with a corresponding the load channels. The channel duty cycle of each channel current control signal is adjusted relative to the input duty cycle in response to the current sense input signals.

LED current control

A circuit for controlling a switch in a power converter in which peak current is regulated to achieve a specified average current through a load. The circuit can include a first input to receive a voltage corresponding to a pre-specified target average current through the load, and a second input to receive a voltage corresponding to a voltage across a sensing resistor immediately after the switch turns ON. The circuit generates a threshold value that is approximately equal to twice the voltage corresponding to the pre-specified target average current through the load, minus the voltage corresponding to a non-zero voltage across the sensing resistor just after the switch turns ON. Control logic is operable to monitor a voltage across the sensing resistor such that when the voltage across the sensing resistor reaches or exceeds the threshold value, the control logic generates a signal that causes the switch to be turned OFF.

A boost converter for high power and high output voltage applications includes a low voltage controller integrated circuit and a high voltage, vertical, discrete field effect transistor. The low voltage controller integrated circuit and the high voltage, vertical, discrete field effect transistor are packaged together in a single package on a common electrically conductive die pad, wherein the controller IC is attached to the die pad using insulating adhesive and the FET is attached to the die pad using conductive adhesive.

Boost converter with integrated high power discrete FET and low voltage controller

A high voltage and high power boost converter is disclosed. The boost converter includes a boost converter IC and a discrete Schottky diode, both of which are co-packaged on a standard single common die pad. The bottom cathode is electrically connected to the common die pad. It is emphasized that this abstract is being provided to comply with rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. This abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

High voltage and high power boost converter with co-packaged Schottky diode

A boost converter for high power and high output voltage applications includes a low voltage controller integrated circuit and a high voltage, vertical, discrete field effect transistor, both of which are packed in a single package on separate electrically isolated die pads.

A high voltage and high power boost converter is disclosed. The boost converter includes a boost converter IC and a discrete Schottky diode, both of which are co-packaged on a standard single common die pad.

A boost converter for high power and high output voltage applications includes a low voltage controller integrated circuit and a high voltage, vertical, discrete field effect transistor, both of which are packed in a single package.

A current limiting load switch for bridging supply Vss and load with a reference voltage VRdynamically generated by a VR-generator is proposed. It includes: A pair of power FET and sense FET interconnected in split-current configuration. The FET pair develops a load voltage while limiting load current Iload to a preset maximum Imax. The FET pair is sized to draw device currents Ipower and Is with RATIO=Is/Ipower&#x3c;&#x3c;1. The sense FET high-side terminal is coupled to Vss through a sense resistor Rsense developing a sense voltage Vs=Is&#xd7;Rsense. A current limiting amplifier with inputs connected to VRand Vs and output controlling FET pair closing a current limiting feedback loop. The VR-generator dynamically adjusts VRconcurrent and compensatory with an undesirable effect of changing RATIOcaused by the sense FET operational transition thus eliminating a transitional overshoot of Iload beyond Imax.

Growing community of inventors

Union City, CA, United States of America

Wai-Keung Peter Cheng