This pin serves as a global control. If the logic is low, internal power is disconnected from the VDDP pin, effectively disabling all functions as a primary safety or power-saving measure. Summary of Fault Protections Protection Type Trigger Condition Resulting Action Open Lamp Secondary voltage exceeds limit without current flow. Controller enters shutdown or limits voltage. Short Circuit ISNS voltage for 256 clock counts. Fault latch is set; IC shuts down. Time-Out Strike interval exceeds time set by CTOcap C sub cap T cap O end-sub capacitor. IC stops trying to strike the lamp.
In RUN mode, if the current level at ISNS drops below 0.3V for 256 consecutive clock counts, a fault latch is set, and the IC shuts down. lx1692 protection pin
This is the classic "two-seconds-to-black" syndrome, and the LX1692 protection pin is almost always involved. This pin serves as a global control
The is a third-generation Direct Drive CCFL (Cold Cathode Fluorescent Lamp) controller. Designed for resonant full bridge inverter topologies, it integrates several safety features to protect against common lamp and circuit failures. Primary Protection Functions Controller enters shutdown or limits voltage
For detailed pin mapping, you can refer to the LX1692 Datasheet at Alldatasheet or Scribd . lx1692 PDF | PDF | Electronic Circuits | Capacitor - Scribd
When the output voltage falls within a predetermined range (usually 85% to 90% of the nominal output voltage), the LX1692 considers the output voltage to be within a valid operating range, and the protection pin is asserted (typically pulled high or low, depending on the specific implementation).
This pin allows for Programmable Time-Out Protection . By connecting an external capacitor, you can set the maximum "strike interval" duration. If the lamp fails to ignite within this time, the IC shuts down the outputs to prevent component damage.