If an LED string is disconnected or "open," the IC will keep increasing the output voltage. The OVP pin detects this runaway voltage and shuts down the driver once the safety threshold is reached.
While specific "bypass" steps for the MP3378E are less documented than older chips like the OZ960, a common method for similar MPS drivers involves placing a between the protection-timing pin (often labeled COMP or SS in other models) and ground to prevent the shutdown latch .
The MP3378E is a versatile integrated circuit from Monolithic Power Systems (MPS) mp3378e protection pin upd
A working channel will have a low voltage (roughly 0.5V���1V). A channel with an open string will show close to the Boost voltage, while a shorted channel will show near 0V. 2. Monitor the OVP Pin
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 If an LED string is disconnected or "open,"
The internal error amplifier forces the boost converter to ramp up the output voltage to compensate.
+-----------------------+ | MP3378E | | TSSOP-28 | | | ------> OVP (Over-Voltage) | ------> COMP (Compensation) | ------> ISET (Current Set) | ------> EN1 (WLED Enable) | ------> EN2 (Buck Enable) | | | +-----------------------+ OVP (Over-Voltage Protection) Pin The MP3378E is a versatile integrated circuit from
The device integrates comprehensive protection modes to ensure system safety and stability: Over-Voltage Protection (OVP): Protects the system from voltage spikes on the output. Over-Current Protection (OCP):
: Master enable pin for the WLED controller. �윍� Understanding the Protection Mechanism
The television or monitor power light remains green or blue, but the panel stays completely dark. �윋� Comprehensive Fault Diagnosis Flowchart