Whether you want to or do an LED backlight conversion
While there are no direct equivalents for every LX1692 variant, alternative manufacturers and part numbers can sometimes be used.
If you want, I can:
The Microsemi LX1692 uses a resonant full-bridge topology to deliver stable, near-sinusoidal waveforms to high-voltage backlight transformers. To prevent component catastrophic failures, high-voltage arcing, or fire hazards, the IC actively monitors lamp current and transformer secondary voltage. The architecture monitors five primary system faults: High-voltage arcing on the transformer secondary side Short circuits across the lamp terminals Shorts from the high side of the lamp to the chassis ground Shorts across the current-sense circuit The Time-Out Filter Logic ( C_TO )
When an LCD panel shuts off just seconds after turning on, use this systematic approach to isolate the root cause: lx1692 protection pin
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This is typically achieved by manipulating the IC's timing/protection capacitor. In general circuit layouts for the LX1692 (and similar ICs like the LX6503):
: This pin monitors the return current flowing through the CCFL tubes. If a single voltage cycle at the ISNS pin surpasses 0.7V peak , the IC transitions from its strike mode into its normal run state. If the voltage drops below its baseline run threshold, the IC flags an open-lamp condition.
Pins involved in setting the "strike timeout" or reference currents might influence the protection latency. 3. How to Troubleshoot or Bypass the LX1692 Protection Pin Whether you want to or do an LED
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The LX1692's safety features are integrated across several pins, each handling a specific type of fault:
As CCFL tubes age, their internal resistance increases, requiring a higher voltage to maintain the plasma arc. If the voltage required exceeds the over-voltage threshold, the PROT pin trips. Physical cracks in the glass envelope or disconnected return wires will simulate an "open lamp" condition, instantly driving the PROT pin high during startup. 2. Shorted High-Voltage Transformers
: If your TV shows a logo for a second and then goes black (backlight shuts off), it is likely in "Protection Mode". Resistance Check Can’t copy the link right now
During a standard ignition sequence, the LX1692 provides a high initial striking voltage. If the lamps light successfully, the operational voltage drops back down to a stable baseline. However, if a fault occurs, the internal mechanics prioritize system shutdown.
Users can set a specific duration for the striking period; if the lamp does not ignite within this window, the controller enters a protection shutdown state.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. LX1692 Resonant CCFL Controller Datasheet | Microsemi