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TCAN1043-Q1: Voltage ripple of 5V power supply - 100mVpp acceptable?

Drake Rider
Intellectual 2030 points
Part Number: TCAN1043-Q1
Other Parts Discussed in Thread: TCAN1043

Hello,

What's the max voltage ripple of a 5V power supply that the TCAN1043 can operate without issues?

Is 100mVpp (1KHz) acceptable?

Any rough estimate on a max value & also advice to minimize that ripple would be appreciated.

  • 0
    TI__Guru 74292 points

    Drake,

    Which power rail are you referring to, VCC? Regardless, 100mVpp should be okay since you're not hitting the under voltage limits on whichever power rail you are supplying. For VCC, that would be 1Vpp (swinging from 4.5V to 5.5V as those are the limits) before you start to see the device functioning incorrectly.

    In terms of noise propagating into the device onto the CAN bus, at that low of switching frequency, there won't be a lot of high frequency passing through, but the best way to mitigate this is to place capacitors close to the supply pin on the transceiver. We typically recommend 4.7uF to 10uF on the VCC pin which should be more than enough, but you want to make sure that this is close to the IC pin.

    Regards,

    Eric Hackett