Lx1692 Protection Pin -

在应用中，LX1692IDW曾被广泛部署于长虹FSP107-2PS01二合一电源板上（配合LG 26英寸CCFL屏），该方案采用两组驱动输出实现了灯管的高效启辉和稳定运行。

Think of it as the for the inverter.

Senses electrical arcing in the high-voltage section. 🔍 How the Protection Works

is a Full Bridge Resonant CCFL (Cold Cathode Fluorescent Lamp) controller. Its protection pins are critical for ensuring system safety by monitoring for faults like open lamps or short circuits. icquest.ru Key Protection Features lx1692 protection pin

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.

The ceramic capacitors on the secondary side of the inverter (rated for 1kV to 3kV) often crack. A cracked capacitor creates an arc or a short, which changes the feedback voltage to the protection pin. Fix: Replace all high-voltage ceramic caps.

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. Its protection pins are critical for ensuring system

Here’s a breakdown of the most important protection pins and their functions.

实测电压数据来源于LX16921DW在长虹FSP107-2PS01电源板上的正常工作环境，实际数值可能随灯管状态和负载变化而略有浮动。该电源板只启用了AOUT/BOUT这一组驱动输出（驱动前级半桥），COUT/DOUT未使用，因此测得电位偏低——这属于应用方案中的常态。

If all physical components (lamps and transformers) are verified to be in good working order but the inverter continues to shut down, repair technicians often need to evaluate or temporarily disable the protection circuitry for diagnostic purposes. and cell protection states

Monitors the voltage level to trigger over-voltage protection if thresholds (typically around ) are exceeded. pdf.ic37.com Disabling Protection (Repair Context)

The LX1692 Protection Pin is a dedicated hardware pin on the LX1692 power-management / battery-protection IC family (assumed context). It provides safe control and signalling for fault, overcurrent, overtemperature, and cell protection states, enabling external systems (MCU, charger, or system power path) to respond to protection events.

Old lamps draw more current than new ones. The LX1692 monitors current balance between two lamps. An imbalance causes a DC offset that eventually triggers the protection pin. Fix: Replace lamps or balance transformers.

This pin is critical for Open-Lamp Voltage Protection . It monitors the transformer's secondary voltage through a resistor divider to prevent it from exceeding safe limits during striking or if a lamp fails.

Protects the inverter if a short occurs across the lamp terminals.