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
| Pin Name | Pin # | Function & Protection Relevance | | :--- | :--- | :--- | | | 20 | Bootstrap for buck converter high-side driver. Critical for gate drive; must be monitored for UVLO condition. | | SYNC | 21 | Synchronization input for buck converter. Connect external clock (250kHz-2MHz) to synchronize switching. | | ISENSE | 22 | Current sense input for WLED controller. Senses external inductor current for peak current-mode control and OCP detection. | | GATE | 23 | Power switch gate output for WLED controller. Drives external N-channel MOSFET; OCP detection involves monitoring gate drive. | | VIN1 | 24 | Supply input for WLED controller. Monitored for UVP. | | VCC1 | 25 | Internal 6V linear regulator output for WLED controller. Supplies external MOSFET driver and internal circuitry; bypass to GND. | | COMP | 26 | Error amplifier output for WLED controller. Used for loop compensation; COMP voltage clamping used in inductor/diode short protection. | | EN1 | 27 | Enable input for WLED controller. Pull high to enable; logic-level control for startup/shutdown. | | PWM | 28 | PWM brightness control input. Used for dimming only; not for enabling/disabling controller. | | LED1-4 | 14,13,12,11 | LED string current sense inputs. Monitor LEDX voltages for open/short string detection. | | OVP | 8 | Over-voltage protection sense input. Set OVP threshold via external resistor divider. | | FB | 9 | Feedback for buck converter. Used for output voltage regulation and OVP detection. | | EN2 | 10 | Enable input for buck converter. Pull high to enable; shutdown controlled by EN2, VIN2 UVLO, or thermal shutdown. | | VIN2 | 18,19 | Supply input for buck converter. Monitored for UVLO. | | SW | 20 | Switching node for buck converter. High-dv/dt node; keep away from sensitive analog areas. | | AGND | 21 | Analog ground reference for buck converter. Connect single-point to GND1. | | VCC2 | 22 | Internal 5V regulator output for buck converter. | | GND2 | 23,24 | Power ground for buck converter. | | ADIM | 16 | Analog dimming control. Supports PWM or DC signal for LED current adjustment. | mp3378e protection pin upd
In consumer electronics repair, engineers frequently search for "mp3378e protection pin upd" (update/modification) to safely bypass or configure the overvoltage and fault protection networks when a TV or monitor experiences an immediate shutdown or backlight flickering. This article provides a comprehensive technical breakdown of the MP3378E protection pins, how they execute safety checks, and how to properly service them. Key Technical Specifications of MP3378E Before modifying any pins, it is crucial to
The MP3378E Datasheet details several pins dedicated to establishing and monitoring protection thresholds. Tweaking these specific inputs can alter or bypass the protection state. | | GATE | 23 | Power switch gate output for WLED controller