I Laj494p Schematic Better

The voltage drops or the supply shuts down when you approach the rated current. The Better Approach : Check your current limiting threshold. You may have set it too low. Also, check the saturation current of your inductor or transformer. If it saturates, current will skyrocket, triggering the protection. Also, ensure your power-stage components (MOSFET, diode) are rated for the peak currents.

: Follow the paths for DISP_ON and BL_PWM (the brightness dimming signal) back to the Super I/O chip ( ENE KB9542Q ) or the CPU graphics engine. i laj494p schematic better

Basic buck converters often lack protection and proper feedback compensation, leading to voltage spikes on startup and instability at high currents. The schematic below is demonstrably better . The voltage drops or the supply shuts down