On specific chassis variations utilizing the LX1692 configuration, the open-lamp protection threshold can be cheated using a dedicated pull-down resistor to mimic a stable current load.
, the protection mechanism is typically associated with (often labeled as OVP or PROT in repair guides). What it monitors: Open Lamp: Detects if a bulb is missing or broken.
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: The time the chip waits for a lamp to start is determined by external resistors (RI_R) and capacitors (CC_TO). Enable Pin Enable Input
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For detailed pinouts and electrical characteristics, you can consult the official Microsemi LX1692 Datasheet or Mitsumi Electronics Datasheet. 7V to 22V. Package Types: 20-Pin TSSOP and SOIC. Dimming Range: Greater than 60:1 using combined methods. lx1692 PDF | PDF | Electronic Circuits | Capacitor - Scribd
Triggered when the output voltage to the CCFL exceeds safe operating limits, which often happens during lamp ignition or if a lamp is cracked or missing. Can’t copy the link right now
Internally, the PROT pin is connected to:
The most fascinating aspect of the LX1692 protection circuit is its windowed sensitivity.
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:
Disclaimer: Repairing inverter circuits involves high-voltage risks. Always handle with care. The LX1692 is available in 20-Pin TSSOP and SOIC packages.