Failsafe multichip LED module driver

The operational life of an LED depends upon how effectively the current flowing through it is kept within the specified limits under all possible working conditions. For multi-chip LED modules, the tightly binned LEDs are arranged in strings having multiple LEDs connected in series, parallel, or series-parallel configurations, sharing a common constant current or voltage source, and each LED string is typically driven at a regulated current that is substantially equal among all of the LED strings.