The LDS9001 and LDS9003 LED controllers, from Leadis Technology, feature the patent pending LED-Sense Temperature Compensation engine. The feature allows for direct in-situ monitoring of the LED junction temperature without the need for an external temperature sensor, thereby optimizing LED brightness and reliability throughout the LED’s full operating temperature range. The LDS9001 and 9003 can independently monitor one and three LEDs, respectively. They are ideal for high-power lighting applications.
The LDS9001 and 9003 offer a new, straightforward way to address thermal reliability constraints in high-power LED lighting applications. Utilizing LED-Sense, the LED controllers provide real-time monitoring of the LED’s junction temperature. Every few seconds, the LED junction temperature is measured in-situ and the current is adjusted on each LED channel using a programmable current versus temperature de-rating profile. This optimizes luminosity while ensuring reliable LED operation.
System designers can reduce guardbands they typically employ, while safely biasing the LEDs at higher currents over the LED’s operating temperature range. As the temperature of the system increases above a pre-set point, the LD9001/9003 intelligently reduces the LED drive current, thereby ensuring that the LEDs operate in a specified safe temperature zone. As a result, at typical operating temperatures, the LEDs can be safely driven at higher currents resulting in greater luminance per LED. This enables the system lighting designer to reduce the number of LEDs by 10 – 20% while achieving the same total luminance. Given the relatively high cost of high-power LEDs, the overall system costs can be significantly reduced.
More information: Leadis Technology