Qualcomm Incorporated

Xinli Peng

Troy L Stockstad

Sandeep Chaman Dhar

Ricardo Goncalves

A circuit may include a control loop to regulate an output of the circuit and a headroom sensing circuit to produce a headroom sensing signal indicative of a headroom voltage of the circuit. The control loop may have a response characteristic that is set based on the headroom signal received from the headroom sensing circuit.

Adaptive stability control for a driver circuit

A circuit for driving a load may include a control loop having a response characteristic. A headroom signal indicative of the headroom voltage of the circuit may set one or more parameters of the response characteristic. A load sign indicative of electrical loading on the circuit may further set the response characteristic.

A method and apparatus for derating current and for derating current for a camera flash. The method comprises monitoring a local junction temperature of a module. The local junction temperature is converted into a local junction current. The local junction current is then compared with a reference current, which is independent of temperature. After the current comparison and subtraction is made, a derate control current is obtained to generate the LED reference current. After the temperature crosses the temperature threshold, the derate control current is derated. Both the temperature threshold and current derate slope are programmable and precisely controlled. The LED output current is regulated and proportional to the LED reference current. If the local junction temperature is greater than the temperature threshold, the LED output current is derated at the moment of the camera flash to avoid thermal overload.

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Chandler, AZ, United States of America

Xinli Peng