Mp3378e Protection Pin Upd !new! -

When an abnormal condition (like a shorted LED string) is detected, the IC starts a timer. If the fault persists, the IC the WLED controller. The "UPD" pin (or associated circuitry) manages this timeout and the latching behavior. Troubleshooting MP3378E Protection Faults

The protection architecture of the MP3378E is designed to monitor three critical failure modes: LED open circuits, LED short circuits, and power component (inductor/diode) failures.

To diagnose a fault (e.g., a backlight that flashes and shuts down), you must check the status of specific pins on the IC. OVP Pin (Pin 9) mp3378e protection pin upd

: Current sink inputs for each LED backlight string. Pin 12 (COMP) : Error amplifier output for compensation.

Ensure the TSSOP-28 EP package has its exposed pad correctly soldered to a large PCB ground plane. If the thermal protection ( ) kicks in, the buck and boost converters will shut down. When an abnormal condition (like a shorted LED

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: Ensure any diagnostic resistors added to Pin 9 are completely removed. The circuit must be returned exactly to the original manufacturer specification found on official hardware schematics. Pin 12 (COMP) : Error amplifier output for compensation

Drives the external MOSFET for the boost circuit. MP3378E - Mouser Electronics