Lx1692 Protection Pin [repack] Jun 2026

LX1692 是第三代直接驱动CCFL的控制器，由Microsemi Corporation（现隶属于Microchip）制造，Mitsumi公司也提供该芯片的相关数据手册，但在技术应用上以Microsemi为主导。该芯片最核心的设计逻辑是采用，利用该特性将电源拓扑从传统的推挽式（Push-Pull）进化为谐振式（Resonant）。这种优化带来了三大优势：它为CCFL灯管提供的近乎正弦波的电流能极大延长灯管寿命；得益于零电压开关（ZVS）软开关技术，系统效率得到显著提升；平稳光滑的开关波形大幅降低了电磁干扰（EMI）。

: Shorted secondary transformer windings or faulty power MOSFETs push current levels over the 2.0V OCTH threshold.

Open Lamp / No Ignition

Power up the monitor or television while monitoring for abnormal heat, component arcing, or localized smoking. Diagnostic Safety Risks

: The chip deactivates over-voltage fault shutdowns until the voltage across the C_TO capacitor crosses 3.5V . This delay provides a user-defined window to ignite the lamps safely. lx1692 protection pin

This pin monitors lamp current via the . It triggers a shutdown if a fault is detected before the lamp lights. If the lamp is shorted to ground, the sensed voltage drops to a low level, and the counter overflows, causing a shutdown.

Registers sudden current spikes resulting from transformer winding failures or chassis shorts.

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Technicians will sometimes place a temporary shunt, such as a 10kΩ to 47kΩ resistor, across this capacitor to ground. This bleeds off the charge and prevents the fault pin from reaching the critical threshold required to trigger a shutdown. This delay provides a user-defined window to ignite

) to set the duration before the controller enters a fault-shutdown state. icquest.ru Pin-Specific Functions

The LX1692 features a dedicated protection pin (typically designated as or Pin 14 , depending on the package type) that monitors the operating conditions of the inverter stage. This pin acts as a summing junction or a direct comparator input for error signals.

What is the when it shuts down? (e.g., flashes for 2 seconds, doesn't light at all)

实际应用中OV_SNS电压在被调节状态下的目标范围是±1.97V（加0.2V直流偏置后约2.17V），允许±8%误差。当灯管老化断路时OV_SNS电压迅速攀升至3.2V以上，芯片计数器迅速计满，控制器立即进入故障锁存模式并将AOUT/BOUT驱动全部关断。 If the lamp is shorted to ground, the

for more than 256 clock counts, the fault latch is set, and the device shuts down.

When the display turns on, the lamps require a high-voltage strike to ignite. During this initial strike window, the protection loop allows a brief grace period.

To determine if the IC is functional, technicians sometimes temporarily bypass the protection latch. This is typically achieved by placing a low-value resistor or a direct jumper from the PROT pin to ground, forcing its voltage to stay at 0V and preventing the internal comparator from tripping.

You can find the LX1692 or its equivalents through these channels: