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WEBENCH® Tools/TIDA-00555: TIDA-00555

shah zaman
Intellectual 625 points
Part Number: TIDA-00555
Other Parts Discussed in Thread: DCH010505D, SN6501, ISO224, AMC1100

Tool/software: WEBENCH® Design Tools

In TIDA-00555 AMC1100 is used for AC voltage sensing, in which isolated  power supply for sensing circuit is designed with SN6501 and  transformer then +5V is generated by TLV70450(LDO) and -5V is TPS7A3001. Transfer is difficult to find and have EMI, so i used DCH010505D to produce +5V and -5V for hot side power generation and  I will give 3.3V for cold side from microcontroller. my question is that is my schematic fine or have any issue ? and for single ended output do i need 1.65V level shifting ? and could you please suggest me which one has high output BW either AMC1100 or  ISO224 and which one is better for AC measuring thanks  

  • 0
    TI__Guru**** 173426 points

    Hi Shah,

    The AMC1100 was designed for use as a current shunt monitor and has an input voltage range of only +/- 250mV.  The ISO224 was designed for use as a voltage monitor and has a +/-12V input range.  The ISO224A has slightly higher BW than the AMC1100, while the ISO224B version offers BW to 275kHz typical.

  • 0 in reply to Tom Hendrick
    Intellectual 625 points

    it means ISO224 is better for isolated voltage sensing, and in evaluation model VDD1 is rpduced for ISO224 using SNR601,transformer and TLV70450(LDO) to find such transformer is not easy so  can VDD1  be produced  DHC010505D right? and one more thing how to scale down the voltage for ISO224? In similar way by voltage divider?  

  • 0 in reply to shah zaman
    TI__Guru**** 173426 points

    Hi Shah,

    The ISO224 can handle VDD1 to 18V, there is an internal LDO.  Voltage divider is the best option to reduce your voltage and scale it to the input range of the ISO224 device.  Someone from the Systems team will follow up on the power supply options.