The TPS92633-Q1 is able to provide full diagnostics and protection to keep the system operating reliably, including the LED short-to-GND, LED open-circuit, and thermal shutdown protection, specially, this device supports single-LED-short(SLS) diagnostic to flexibly fit different diagnostic requirements. After the fault is removed, this device can recover to normal operation automatically. The one-fails-all-fail function is supported by this device to meet the system design requirement. The LED open-circuit and single-LED-short functions can be disabled through setting an accurate threshold of DIAGEN pin. Once the TPS92633-Q1 has asserted a LED fault on the LED string, the device turns off the faulty channel and auto-retries with a retry current.

In high current application, the retry currents of each channel are combined together if all three channels are connected together. For LED-string short-to-GND and LED open-circuit fault, the device keeps the same fault behavior. But since the diagnostic mechanisms of single-LED-short function are different from others and more complicated, some special deign considerations are required to make sure the device is working properly as expected.