For detailed design-in support, refer to the official MP3378E datasheet and EV3378E-F-00A evaluation board documentation available from MPS.
: Bypassing over-current safeguards places the external boost MOSFET and inductor under unchecked stress, which can lead to permanent component failure and scorched circuit board traces.
The most common application. Place an NTC thermistor from UPD to GND, with a pull-up resistor to the internal 5V.
The MP3378E includes comprehensive protection mechanisms that monitor various conditions to prevent hardware failure: LED Protection : Detects and responds to both mp3378e protection pin upd
: If an LED string shorts out, the voltage on its corresponding VLED pin will spike. If it drops too low, an open circuit is detected. The IC cross-references these channels and will trip the latch if it detects a stark mismatch exceeding the 2.5% matching threshold. Diagnosing Backlight Failures and Latch Protection
: Monitored via the VIN pins . The IC remains disabled until the input voltage exceeds a specific startup threshold.
When an LED backlight fails—either due to a burnt-out diode or a degraded solder joint—the MP3378E enters protection mode. This creates a common symptom known as the : The TV/monitor is powered on. The splash logo (e.g., Sony, Samsung) briefly appears. For detailed design-in support, refer to the official
The is a versatile, single-chip integrated circuit designed by Monolithic Power Systems (MPS) for liquid crystal display (LCD) monitor applications. It combines a 4-channel White LED (WLED) controller for backlighting with a high-efficiency buck converter for internal system power.
Modifying the resistor divider on the to raise the threshold, preventing premature shutdown due to slight voltage spikes. LED Channel Disable
Before modifying any pins, it is crucial to understand the baseline capabilities of the integrated circuit (IC) as outlined in the Mouser Electronics MP3378E Datasheet : Specifications 4 independent strings Max String Current 350mA per channel Input Voltage Range Dimming Modes Independent PWM and Analog Integrated Protections OCP, OTP, UVP, OVP, LED Short/Open Package Type TSSOP-28 EP Anatomy of the MP3378E Protection Pins Place an NTC thermistor from UPD to GND,
MP3378E Protection Pin UPD: Deep Dive Guide to Over-Voltage Protection (OVP) and Backlight Diagnostics
: Manages up to 4 distinct LED strings with an impressive 2.5% current matching accuracy.
The MP3378E has 4 strings. If one string is open or shorted, the IC will shut down.
When dealing with older LCD screens, individual LEDs inside the backlight panel slowly degrade, shifting their forward voltage drop. This minor imbalance can trip the MP3378E's highly precise 2.5% current matching logic, triggering a complete shutdown even if the panel is safely usable. Modifying the protection behavior allows technicians to isolate whether the root issue lies within a faulty IC controller, an open boost diode, or a failing LED string array. Diagnostic Procedures for the Protection Circuit
For detailed design-in support, refer to the official MP3378E datasheet and EV3378E-F-00A evaluation board documentation available from MPS.
: Bypassing over-current safeguards places the external boost MOSFET and inductor under unchecked stress, which can lead to permanent component failure and scorched circuit board traces.
The most common application. Place an NTC thermistor from UPD to GND, with a pull-up resistor to the internal 5V.
The MP3378E includes comprehensive protection mechanisms that monitor various conditions to prevent hardware failure: LED Protection : Detects and responds to both
: If an LED string shorts out, the voltage on its corresponding VLED pin will spike. If it drops too low, an open circuit is detected. The IC cross-references these channels and will trip the latch if it detects a stark mismatch exceeding the 2.5% matching threshold. Diagnosing Backlight Failures and Latch Protection
: Monitored via the VIN pins . The IC remains disabled until the input voltage exceeds a specific startup threshold.
When an LED backlight fails—either due to a burnt-out diode or a degraded solder joint—the MP3378E enters protection mode. This creates a common symptom known as the : The TV/monitor is powered on. The splash logo (e.g., Sony, Samsung) briefly appears.
The is a versatile, single-chip integrated circuit designed by Monolithic Power Systems (MPS) for liquid crystal display (LCD) monitor applications. It combines a 4-channel White LED (WLED) controller for backlighting with a high-efficiency buck converter for internal system power.
Modifying the resistor divider on the to raise the threshold, preventing premature shutdown due to slight voltage spikes. LED Channel Disable
Before modifying any pins, it is crucial to understand the baseline capabilities of the integrated circuit (IC) as outlined in the Mouser Electronics MP3378E Datasheet : Specifications 4 independent strings Max String Current 350mA per channel Input Voltage Range Dimming Modes Independent PWM and Analog Integrated Protections OCP, OTP, UVP, OVP, LED Short/Open Package Type TSSOP-28 EP Anatomy of the MP3378E Protection Pins
MP3378E Protection Pin UPD: Deep Dive Guide to Over-Voltage Protection (OVP) and Backlight Diagnostics
: Manages up to 4 distinct LED strings with an impressive 2.5% current matching accuracy.
The MP3378E has 4 strings. If one string is open or shorted, the IC will shut down.
When dealing with older LCD screens, individual LEDs inside the backlight panel slowly degrade, shifting their forward voltage drop. This minor imbalance can trip the MP3378E's highly precise 2.5% current matching logic, triggering a complete shutdown even if the panel is safely usable. Modifying the protection behavior allows technicians to isolate whether the root issue lies within a faulty IC controller, an open boost diode, or a failing LED string array. Diagnostic Procedures for the Protection Circuit
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