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SN65HVD234: Current Consumption

Daniel Gregor
Prodigy 90 points
Part Number: SN65HVD234

Hi,

the max. output current of my DC/DC is only 60mA. I would like to know if this power supply is sufficient.

In the datasheet Icc is specified without load an so not helpful. The max. diferential output voltage is 3V. Hence the max. output current with 60Ohm load is 50mA. This means that the supply current is 50mA plus the current consumption of the chip. Is my consideration right? I use the chip in a network up to five nodes. The other nodes have 5V transceivers. So maybe also common mode currents must be considered.

Can you please specify the max. current consumption with 60Ohm load.

Thanks?

Daniel

  • 0
    TI__Mastermind 25705 points
    Daniel,
    Your calculation is correct. If output voltage is 3 V, the current flowing over 60 Ohm would be 50 mA. On top of that, the chip current consumption is about 6 mA. In total, DC/DC needs to provide 56 mA for one SN65HVD234. One thing you may want to know is that the receiver has some input impedance (about 24 kOhm) that draws current too (section 8.7 Ii Bus input current). So 60 Ohm load becomes a little smaller with your 5 receivers attached to the bus. Please let me know if you have any questions.
    Regards,
  • 0 in reply to Hao L
    TI__Mastermind 25705 points
    Daniel,
    Have you tested if the current is OK? If you have concern and want to leave some margin, you can also consider using a supply with a little more current capability. Please let me know if you have any questions.
    Regards,