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It's a gradual. Ramped increase.Is the increase (former "rise") a sudden or a gradual change?
The duty cycle is 20% before the switch and I have measured the same.1) Is the duty cycle intended to be a constant 20% before you press the switch?
2) Can you monitor duty cycle on the scope before you press the switch?
3) Can you capture the scope waveform exactly 350ms after pressing the switch?
4) With a 100Hz PWM frequency there will be only 35 pulses in that 350ms period, so the RC filter method probably won't work ;(