If the voltage at the OVP pin exceeds the threshold (typically 1.23V ), the step-up converter shuts down to prevent damage to the external MOSFET and LED strings.
This pin monitors the output voltage of the boost converter. If a string of LEDs becomes "open" (disconnected), the output voltage will rise rapidly as the controller tries to maintain constant current. The OVP pin prevents this by triggering a shutdown when the voltage exceeds a programmed threshold, typically set via an external resistor divider.
In many repair scenarios, the serves as the primary "protection pin" that triggers a shutdown.
Replaced both divider resistors with 0.1% parts (124kΩ upper / 5.23kΩ lower for 48V output). PROT pin locked at 1.25V, backlight restored.
If the voltage at the OVP pin exceeds the threshold (typically 1.23V ), the step-up converter shuts down to prevent damage to the external MOSFET and LED strings.
This pin monitors the output voltage of the boost converter. If a string of LEDs becomes "open" (disconnected), the output voltage will rise rapidly as the controller tries to maintain constant current. The OVP pin prevents this by triggering a shutdown when the voltage exceeds a programmed threshold, typically set via an external resistor divider. mp3378e protection pin upd
In many repair scenarios, the serves as the primary "protection pin" that triggers a shutdown. If the voltage at the OVP pin exceeds
Replaced both divider resistors with 0.1% parts (124kΩ upper / 5.23kΩ lower for 48V output). PROT pin locked at 1.25V, backlight restored. mp3378e protection pin upd