i200yrs
Full Member level 2
Hello mates...good day..I has been troubleshooting this lambda power supply (5V, 200A) for about 60days. So this could be the right time to call for help. The failure is the power supply generates a strong audible sound at only 10A load. We have good unit here but it never create a sound at any point of load. I replaced all high frequency transformers, all power mosfets, all capacitors, all op-amps, all transistors, and all IC including the PWM. We are using UC3524 PWM. Without load the voltage is correct 5V and no sounds. Really appreciates any inputs from you guys....thanks a lot.