Mp3378e Protection Pin Upd |verified| -

This section manages the high-voltage boost converter and current sinking for the LED backlight strings. Its protections are critical for panel safety.

To set the maximum allowable output voltage, select the upper ($R_OVP_UP$) and lower ($R_OVP_LOW$) divider resistors using the formula: $$V_OUT_MAX = V_OVP_TH \times \left(1 + \fracR_OVP_UPR_OVP_LOW\right)$$

: The boost converter relies on an external inductor and a Schottky diode. If either component were to fail shorted, the result could be a direct short from input to output, potentially destroying the IC and panel. The MP3378E is designed to detect this condition by monitoring the current and voltage waveforms. If a short is detected, it shuts down the boost converter to prevent damage. mp3378e protection pin upd

Check the voltage at the OVP pin (resistor divider from Boost output to Ground). 3. Check for False Triggers

Are you currently troubleshooting a issue or designing a new PCB layout for this chip? MP3378E - Monolithic Power Systems This section manages the high-voltage boost converter and

Switching regulators must deliver stable output voltages while protecting themselves and the load from abnormal conditions such as short circuits, overcurrent, thermal stress, and output overvoltage. Dedicated protection pins provide hardware-level interfaces that expose these protection functions to system designers, enabling predictable interactions between the regulator and the rest of the system (for example, enabling external shutdown, signaling fault status to a microcontroller, or allowing configuration of threshold/response behavior).

The MP3378E does not rely on a single, isolated "protection pin." Instead, its protection loop functions as a network across multiple dedicated terminals. The IC constantly samples conditions at key interface pins to ensure neither the buck converter nor the WLED boost controller suffer permanent damage. 1. Over-Voltage Protection (OVP Pin) If either component were to fail shorted, the

To modify the over-voltage protection point or trick the IC into ignoring an open string loop: MP3378E Datasheet (PDF) - ALLDATASHEET.COM

Misconfiguration of the PROT pin is the leading cause of "No Backlight" or "Cycle Power Cycling" failures in new MP3378E designs.

The protection architecture of the MP3378E is designed to monitor three critical failure modes: LED open circuits, LED short circuits, and power component (inductor/diode) failures.

The MP3378E is a highly integrated, single-chip solution from Monolithic Power Systems (MPS) designed for monitor backlighting applications. It combines a 4-channel WLED (White Light-Emitting Diode) controller and a high-efficiency buck converter in a single TSSOP-28 EP package.