首页>
外国专利>
Method and apparatus for current derating with integrated temperature sensing
Method and apparatus for current derating with integrated temperature sensing
展开▼
机译:具有集成温度感测的电流降额的方法和装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
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.
展开▼