Check if the resistor divider has drifted. A shifted resistance can trick the IC into triggering an early over-voltage shutdown.
, up to 24V) into the higher forward voltage needed to power the display backlight. The Buck Converter
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 mp3378e protection pin upd
These pins monitor the current through the external MOSFET and the LED strings. If an inductor or diode shorts out, or if the current exceeds the limit set by the current-setting resistor, the IC immediately disables the driver to protect the internal circuitry and external components from melting. Critical Thresholds and Parameters
The step-up WLED driver regulates current across four separate LED strings. It controls an external MOSFET to boost the main DC input voltage ( VIN1cap V cap I cap N sub 1 Check if the resistor divider has drifted
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)
When troubleshooting backlights managed by MPS controllers , technicians modify the feedback pins to stop the IC from shutting down. This allows them to measure the operating currents across all four channels and find the fault. The Buck Converter The MP3378E doesn't have a
Shuts down the IC if the junction temperature exceeds safe limits. 2. Key Protection Pins on the MP3378E
