Re: Solid State Relays and EMI

From: Arie de Muynck (Sorry_I_hate_spam_at_nomail.com)
Date: 07/26/04

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    Date: Mon, 26 Jul 2004 21:17:44 +0200

    > The ones I'm using involve a LED and a MOSFET, not a
    > coil.
    >
    > http://www.cel.com/pdf/datasheets/ps7141a.pdf

    Thanks for answering my question - although on another part of the thread...

    You may not know it, but the light from the LED does not directly turn-on
    the MOSFET. It shines on a string of small photovoltaic cells that charge
    the gates. When the light is off, the photocell leakage current (sometimes
    with an extra resistor across them) discharges the gate again.

    Any idea what happens if an RF voltage is capacitively coupled from LED pins
    to the _string_ of photodiodes? It's called rectification. The resulting
    voltage turns on the gate.

    Did you alrady do the test with the 1nF between driver size and output side?

    Regards,
    Arie de Muynck

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