Mp3378e Protection Pin Upd ((exclusive)) Direct

4-channel WLED backlight controller

The MP3378E is a dual-function chip containing a and a high-efficiency buck converter , commonly used in monitors and LED TVs. Overview of MP3378E Protection Pins

Resistor Selection Calculation:

To set the maximum allowable output voltage, select the upper ($R_OVP_UP$) and lower ($R_OVP_LOW$) divider resistors using the formula: $$V_OUT_MAX = V_OVP_TH \times \left(1 + \fracR_OVP_UPR_OVP_LOW\right)$$ mp3378e protection pin upd

• During a hard short at the output, the device may either enter a hiccup/retry mode (periodic attempts to restart) or latch off to prevent thermal runaway. The PROT pin indicates the state and, if supported, can be used to reset a latched fault.

• If VOUT never reaches 80% of target, suspect UVLO or soft-start issue.
• If VOUT overshoots target by >10% before PROT pin reacts, suspect OVP divider lag (add a 10nF cap across lower divider resistor).

The MP3378E features several protection mechanisms that can cause the backlight to shut down (protection mode) if a fault is detected in the LED strings or the power delivery system. Key pins involved in these protections include: 4-channel WLED backlight controller The MP3378E is a

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): During a hard short at the output, the

| Requirement | PRO pin | UPD setting | |-------------|---------|--------------| | Latch-off on any fault | GND | Disabled (default) | | Auto-restart (hiccup) | >2V | Disabled | | Operate below 4.5V VIN | >2V (auto-restart) | Enabled | | Operate below 4.5V + latch-off | GND + external reset circuit | Enabled (rare) |