is a integrated circuit from Monolithic Power Systems (MPS) designed for monitor applications. It combines a 4-string WLED controller for backlighting with a high-efficiency buck converter for internal power. MPS | Monolithic Power Systems The "protection pin" functionality primarily relates to the OVP (Over-Voltage Protection)
VOVP_HYScap V sub cap O cap V cap P _ cap H cap Y cap S end-sub 80mV Prevents rapid flickering at the threshold. OVP Pin Number Pin 10 Physical location on the TSSOP-28 package. Troubleshooting & "Bypassing" Protection mp3378e protection pin upd
The Go to product viewer dialog for this item. 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 is a integrated circuit from Monolithic Power Systems
Calculate expected PROT voltage:
V_PROT = VOUT * (R_lower / (R_upper + R_lower))
Compare with measured PROT pin voltage with EN low. A discrepancy >2% indicates leakage or damaged resistors. PRO pin must not float – tie to
The OVP pin uses a resistor divider from the output to ground to set the threshold.
Common Method: While specific to other ICs like the ACM20005, common technician tricks involve using a diode or resistor to ground a protection pin to see if the backlight stays on. Warning: Bypassing protection on the MP3378E can lead to permanent damage to the IC or the LED panel if the underlying fault (like a short circuit) is not fixed. Pinout Summary (TSSOP-28 EP Package)
In modern LCD display systems (TVs, monitors, automotive displays), the LED backlight driver is critical. Among the leading solutions is the MP3378E from Monolithic Power Systems (MPS), a highly integrated boost controller with 8-channel current sinks.