Mp3378e Protection Pin Upd → [CONFIRMED]

The MP3378E is a highly integrated 4-channel WLED controller designed for LCD backlighting, commonly found in monitors and flat-panel displays. A critical part of its reliability is the Over-Voltage Protection (OVP) pin, which serves as the primary "protection pin" for monitoring output stability and preventing hardware failure. Key Functions of the Protection (OVP) Pin

Used for analog brightness control; allows linear current setting from minimum to full. VLED1 to VLED4: mp3378e protection pin upd

The OVP pin is a dedicated input that monitors the output voltage of the step-up converter to prevent catastrophic failures. The MP3378E is a highly integrated 4-channel WLED

1. Over-Voltage Protection (OVP Pin)

The OVP pin is the primary hardware protection pin for the MP3378. It monitors the output voltage of the boost converter to prevent damage to the system if the LED strings become open or disconnected. Pull-up resistor to system logic supply (e

• Pull-up resistor to system logic supply (e.g., 3.3 V) to create a fault interrupt line for microcontrollers.
• RC timing from PROT to ground to set hiccup period or blanking times.
• A diode or resistor to implement a manual reset/power-good handshake.
• LED and current-limiting resistor for simple fault indication.

Fix: Replaced both divider resistors with 0.1% parts (124kΩ upper / 5.23kΩ lower for 48V output). PROT pin locked at 1.25V, backlight restored.

Over-Current Protection (OCP): Limits current to the external MOSFET and internal buck converter.