Bypassing protection is a fire hazard and should only be done for diagnostics. Never leave a bypassed circuit running unattended.
The chip includes a strike time-out function. The interval is determined by the values of the current reference resistor ( ) and an external capacitor ( Formula: Short Lamp Detection: This also relies on the Formula: Troubleshooting & Protection Bypass
A small resistor and capacitor smooth the DC ripples before the signal enters Pin 5. Common Causes for Protection Triggering lx1692 protection pin
The primary fault conditions monitored by the LX1692 include:
For many similar backlight ICs, protection is bypassed by grounding specific timing pins or using a resistor/LED to pull a fault pin to a stable voltage. Specific to LX1692: Bypassing protection is a fire hazard and should
The LX1692 monitors four key parameters. If any of these exceed safe thresholds, the IC will internally pull PROT low:
The IC constantly measures voltage through sensing networks. If the voltage feedback surpasses a factory-calibrated internal reference voltage, the LX1692 marks the situation as an active fault condition. 2. The Latch Delay Window The interval is determined by the values of
The key takeaway for repair technicians: don't just disable the protection. Use it as a diagnostic clue to find and fix the real problem.
: Old lamps need higher striking voltages. If the strike time outlasts the window set by the C_TO capacitor, the controller terminates power. How to Bypass the LX1692 Protection Pin
Internally, the PROT pin is connected to: