Mp3378e — Protection Pin Upd

The MP3378E integrates several protection modes for both the WLED controller and the buck converter: MPS | Monolithic Power Systems Controller Part Integrated Protections WLED Controller

If you are working on a specific repair, what are the symptoms you are seeing? Is it no backlight or flashing backlight? If you want, I can: Give you specific pin voltages for troubleshooting Suggest methods to bypass the OVP pin for testing MP3378 - micrIC

Monitors the voltage on the boost converter output. mp3378e protection pin upd

The MP3378E is a versatile, one-chip solution designed by Monolithic Power Systems (MPS) for monitor applications. It combines a 4-string WLED (White LED) controller for backlighting with a high-efficiency buck converter for system power.

conditions (e.g., a loose LED connection), where the boost converter would otherwise indefinitely increase voltage trying to maintain constant current. Comprehensive Protection Features The MP3378E integrates several protection modes for both

These open-drain pins connect to the cathodes of individual LED strings to regulate current and monitor performance.

The PROT pin is high-impedance (~1MΩ). Flux residue, moisture, or conformal coating can create leakage paths. The MP3378E is a versatile, one-chip solution designed

Ensure all LED strings have similar forward voltage drops. ISENSE Pin (Pin 22)

This section manages the high-voltage boost converter and current sinking for the LED backlight strings. Its protections are critical for panel safety.

Sometimes placing a high-value capacitor (e.g., 100nF - 1μF) from a pin like "FAULT" to GND can increase the delay time, allowing the system to start if it was a false start issue.