Lx1692 Protection Pin <TRENDING • 2027>

) from the protection-sensing pin to ground to simulate a "normal" load.

The LX1692 integrates several safety features that monitor the operating conditions of the CCFL lamps and the transformer. When these circuits detect an anomaly, the IC triggers a "protection mode" to shut down the output gate drivers, preventing damage to the external MOSFETs or the high-voltage transformer. Key protection features include:

| Fault Condition | Trigger Source | Result | |---|---|---| | Open Lamp (OL) | Current feedback < threshold | PROT low → IC latches off | | Over-Voltage (OVP) | Output voltage > OVP threshold | PROT low → IC latches off | | Over-Current (OC) | Secondary current > OC threshold | PROT low → IC latches off | | Thermal Shutdown (TSD) | Junction temp > ~150°C | PROT low → IC latches off |

: Once a fault is detected, the IC stops the switching pulses to the power stage, causing the backlight to turn off—often seen as a "one-second" or "two-second" flash of the screen followed by darkness. Bypassing for Troubleshooting