TLD2314EL_15 Datasheet, PDF (21/31 Pages) Marl International Limited – Basic LED Driver

TLD2314EL
Load Diagnosis
8.3
Double Fault Conditions
The TLD2314EL allows the diagnosis of each channel separately, as long as the ST-pin is shorted to GND The
diagnosis filter times t_OL and t_SC (Pos. 8.4.9 and Pos. 8.4.12) are valid only for the channel, which diagnoses first
the fault condition. For the other channel or channels with a subsequential fault the diagnosis is reported
immediately without the diagnosis filter time, if the filter time t_OL has been elapsed for the channel with the first
fault. During activation via IN_SET of a non-faulty output, where one channel has already a fault detected, a short
spike to V_{IN_SET(OL/SC)} could occur on the channel, which should be activated. Therefore, in general a diagnosis
should be done earliest after the diagnosis filter times t_OL and t_SC to avoid any incorrect diagnosis readout. In the
scenario mentioned above the turn on time t_{ON(IN_SET)} could be extended. The following figure shows the example
behavior, if OUT1 has a fault and OUT2 is operated in PWM-mode. OUT3 is disabled.
Data Sheet
21
Rev. 1.1, 2015-03-24