Bypassing protection pins on WLED controllers like the MP3378E from MPS can lead to overheating, burnt LED strips, or permanent damage to the IC.
The MP3378E is a synchronous buck converter integrated circuit designed for high-efficiency voltage regulation in portable and battery-powered applications. A key feature that contributes to its robustness and reliability is the protection circuitry associated with its PROT (protection) pin. This essay explains the role, behavior, implementation details, interaction with other protection features, typical usage patterns, and design considerations for the PROT pin on the MP3378E. mp3378e protection pin upd
: While primarily for setting the LED current, this pin also detects faults. An open or shorted ISET resistor will trigger protection mechanisms to disable the WLED driver. Bypassing protection pins on WLED controllers like the
Monitors the current through the external switching MOSFET and LED strings to prevent damage from excessive power draw. Monitors the current through the external switching MOSFET
Note: specific electrical characteristics (threshold voltages, timing windows, pin-package names) can vary by manufacturer revision—consult the device datasheet and manufacturer application notes for precise numbers when designing. The treatment below uses standard conventions for modern synchronous buck controllers and the MP3378-family behaviour as commonly documented.
The MP3378E integrates several protection modes for both the WLED controller and the buck converter: MPS | Monolithic Power Systems Controller Part Integrated Protections WLED Controller