MIC2298_11 Datasheet, PDF (12/13 Pages) Micrel Semiconductor – 3.5A Minimum, 1MHz Boost High Brightness White LED Driver

Micrel, Inc.
LED Protection
The operation of the Power LED must be limited to short
pulses to prevent overheating. This is usually controlled
by the micro controller in a typical application. For further
protection, or where a micro controller is not used, the
temperature of the LED can be limited by the addition of
an NTC thermistor. The value should be > 100kΩ at its
maximum safe temperature. This will then limit current
drive to the LED as temperature rises further and
prevents overheating. This thermistor should be
connected directly from BRT to GND. Reference Figure
10.
MIC2298
Figure 10. LED Thermal Protection
October 2007
12
M9999-101707-B