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Proposal for M-BUS

[FAE] Andrew Wang
Genius 10685 points

Other Parts Discussed in Thread: TL431

Hi Team,

Customer is asking which op-amp do we suggest for the M-BUS ?

From below info, max voltage is 32V, max current is about 2x mA. 

Thanks!

Andrew

  • 0
    TI__Guru**** 170496 points

    Hello Andrew,

    M-Bus, that I only have known about for 10 minutes from one page description, is a digital system so starting with the op amp is not a great plan of action.

    The power supply is a better place to start. I would think that a 1.3mA current source that charges a capacitor to an under voltage lock out level then enables a low current (1mA) switching supply that output 5V (or less) to run the sensor and logic and op amp. Maybe there is a dedicated M bus power chip available that does this, I have not looked. If the whole module is very low current then a linear regulator (such as a TL431 shunt) could work.

    The digital output is a low tolerance 11mA to 20mA , A simple NPN transistor sink driven by logic could do that. 

    If the sensor needs an op amp, then give the details for that need.