Protection Pin Upd !new!: Mp3378e

Connect an open-drain/collector transistor or mechanical switch between UPD and GND. When activated, it pulls UPD low → immediate latch-off.

The MP3378E doesn't have a single "protection pin." Instead, it uses a network of monitoring pins to trigger a shutdown if any safety threshold is exceeded. Understanding these pins is the key to diagnosing a backlight that flashes then dies. MP3378E - Monolithic Power Systems

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Set the over-voltage protection threshold using a resistor divider from the boost output (VOUT) to PROT.

I can provide the exact resistor values and schematic adjustments needed for your update. AI responses may include mistakes. Learn more Share public link Understanding these pins is the key to diagnosing

Both stages are monitored by a combined array of protective sensors. The IC tracks parameters across multiple pins to trigger a shutdown if conditions become unsafe: (Over-Current Protection) OVP (Over-Voltage Protection) UVP (Under-Voltage Protection) OTP (Over-Temperature / Thermal Shutdown) LED Short/Open Protection Inductor/Diode Short Protection 2. Key Pins Related to Fault Protection

Place a high-quality, low-ESR ceramic capacitor near the VCC1 pin to suppress gate driver switching noise. AI responses may include mistakes

Monitors the voltage on the boost converter output.

This pin samples the boosted output voltage via a resistive voltage divider network. If the feedback voltage surpasses the internal reference threshold (typically due to an open LED string where the boost converter aggressively overcompensates), the IC immediately latches off the gate driver channel to prevent component explosion. 2. The LED1 to LED4 Channels

Through analysis of dozens of field returns and reference design failures, three primary scenarios lead to a UPD fault.

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.