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ISO1410: Bypass capacitance

Genius 15690 points
Part Number: ISO1410

Hello,

I have a question for bypass capacitance value of ISO1410.
The datasheet recommends to put 0.1uF on VCC2 as a bypass capacitance.
Then it also says that adding 10uF bulk capacitor is better way.
Is there any limitation for this additional capacitance value.
I mean is there any problem to change this additional capacitance value from 10uF to other value like 2.2uF?

Regards,
Oba

  • Hi Oba,

    The 0.1µF capacitance is necessary for the device to operate normal, hence this is mandatory. The additional 10µF is a recommendation which can help the device in many ways in certain conditions.

    For example, if the power supply powering ISO1410 is tightly current limited or is very far from device the 10µF decap can help. If there is lot of EMI noise created at VCC during EMC tests, then the local 10µF can come very handy and hold the device stable and not let it turn off. It is also useful if the PCB layout is not optimum and it benefits in many other ways.

    I think 2.2µF instead of 10µF is still going to be useful. So if customer cannot use 10µF, then I think it is still okay to use 2.2µF. If there is no major constraint in using 10µF, then I would recommend them using 10µF. Thanks.

    Regards,
    Koteshwar Rao