Mp3378e Protection Pin Upd |link| Here

: This pin monitors the output voltage through a resistor divider. If the voltage exceeds a programmed threshold (typically due to an open LED string), the controller shuts down or limits the output to prevent damage to the external MOSFET or LEDs.

Before modifying any circuit architecture, it is essential to understand the nominal operating boundaries of the IC as outlined in the MP3378E Datasheet : : 8V to 24V nominal. WLED Current Capability : 4 channels up to 350mA per string.

If your MP3378E is entering a protection state (shutting down shortly after power-up), check these common failure points: mp3378e protection pin upd

: Provides a step-down internal bus or standby power rail via internal low

The is a 4-channel WLED controller and high-efficiency buck converter primarily used for LCD backlight applications. While it does not feature a single pin explicitly labeled "Protection," its safety functions are distributed across several dedicated pins: Key Protection Pins and Functions : This pin monitors the output voltage through

Technicians often check the voltage on this pin; if it exceeds the internal reference, the IC shuts down. In some ICs (like the related MP3398E), connecting a to ground can stabilize protection behaviors . Disabling Protection (For Diagnosis Only):

For specific pin-out details and timing diagrams, you can refer to the official MP3378E Datasheet from Mouser or a specific resistor value calculation for setting the protection thresholds? MP3378E - Monolithic Power Systems WLED Current Capability : 4 channels up to 350mA per string

These four pins act as current sinks for the backlight strings. They also operate as secondary protection monitors:

Bypassing protection can cause permanent damage to the LEDs or the driver if an actual short circuit exists . Current Adjustment: