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TPS92210 VDS waveform

Maverick.G
Prodigy 90 points
Other Parts Discussed in Thread: TPS92210

Hello Friends,

Pls help interpret the attached waveform. Why is the waveform getting chopped from top... how to resolve it. 

Maverick

  • 0
    Prodigy 90 points

    Hi

    It is very quite out here. Let me elaborate on the problem that I am facing.

    I have designed a led driver using TPS92210 to output 75V / 600mA.  Input range I intend to operate is 100VAC to 300VAC.

    The transformer has turns as mentioned below...

    Pri: 28 Turns; Sec: 28 Turns; Bias 12 Turns; Core: PQ2620; Freq 85 KHz; On_Time: 4.5uS.

    Leaving alone the spike or overshoot, I am expecting max Vds @ 295V to be around 495V and measured also is close to that. The relaxation ring caused by the parasitic / stray capacitance is getting chopped off.  I have captured (@295VAC) the Vds waveform  and attached for your reference.

    What want to know the reason why it is getting chopped off and would it make my board unreliable. 

    Pls reply

    Maverick