The Flash Time-Out period sets the amount of time that the Flash Current is being sourced to the current sources (LED1/2/3/4). The LM3645 has 16 timeout levels (bits [3:0] in reg 0x0A) ranging from 10 ms to 400 ms or from 40 ms to 1.6 s depending upon the time-out multiplier bit ([4] in reg 0x0A). Additionally, there is an option to disable the time-out all together however care must be taken to ensure that the LEDs are not held in a high current condition longer than they are rated for, and care must be taken to ensure LM3645 does not hit the thermal scaleback or thermal shutdown faults. Additionally, changing the time out duration while in a flash event is not recommended as doing so will force the flash duration to be extended.