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I am working on a SMPS (450 V output). It use an ML4800CP IC to control and manage 450 V DC.

How can I measure the PWM signal using an oscilloscope? I attached it, and it worked well for the PFC signal, but I couldn’t sense PWM, maybe due to there being no load. It approaches 450 V immediately and I couldn’t get any PWM waveform.

Can I apply a dummy load so that the PWM continues? If yes, then how much load? Is there some other way to get a wave form on my oscilloscope?

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  • \$\begingroup\$ You know what the expected load of your power supply is, so calculate a suitable resistance. Use a couple of incandescent light bulbs if necessary. \$\endgroup\$
    – Kartman
    Commented Apr 18 at 15:31

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