Lx1692 Protection Pin

The protection pin on the LX1692 serves multiple purposes, depending on the specific implementation and design. It can be used for:

Before we focus on the pin itself, let us establish context. The LX1692 is a high-efficiency, current-fed push-pull inverter controller. Its primary job is to convert a DC voltage (typically 5V to 24V) into a high-frequency AC waveform to drive CCFL tubes. These tubes provide the backlight for older LCD monitors, TVs, and laptops.

The chip includes several safety features, including over-voltage protection (OVP), over-current protection (OCP), and open-lamp protection. All of these safety signals feed into a single, master control pin known as the Protection Pin.

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

The LX1692 includes several integrated safety mechanisms designed to protect the inverter and lamps: Open Lamp Protection: lx1692 protection pin

Detects when a lamp is missing or disconnected to prevent high-voltage arcing. Short Lamp/Short Circuit Protection:

Shuts down the controller if a short is detected in the lamp or secondary circuit. Over Voltage Protection (OVP):

Limits the transformer secondary voltage to prevent insulation breakdown. Programmable Time Out Protection:

Uses an external capacitor (typically on a dedicated pin like The protection pin on the LX1692 serves multiple

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

Based on technical data sheets, the following pins are directly related to protection and fault monitoring: C_TO (Time Out):

Connects to an external capacitor to program the "strike" time and fault timeout period. ISNS (Current Sense):

Monitors lamp current. If the signal is below a specific threshold (e.g., 0.3 cap V sub p k end-sub during strike), it may trigger open-lamp protection. OVSNS (Over Voltage Sense): Its primary job is to convert a DC

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

In television repair, technicians sometimes "bypass" or "remove" protection to diagnose faulty lamps or transformers. For the LX1692: Technicians often use a resistor (typically 10k

connected between a specific protection-related pin and ground to prevent the IC from entering shutdown mode.

Note: Bypassing protection is a diagnostic step only and can lead to hardware damage if left permanently. Do you need the exact pin number

for a specific package (TSSOP vs. SOIC), or are you looking for the electrical thresholds for a custom circuit design? LX1692 - icquest.ru

KEY FEATURES. ▪ For Wide Voltage Range Inverter. Application (7V to 22V) ▪ Patent Resonant Strike for. Unsurpassed Striking Power. icquest.ru LX1692 - icquest.ru