DAC161S997: DAC 1612997 power loop

Chen Alex1

Expert 2315 points

Part Number: DAC161S997
Other Parts Discussed in Thread: , TPS61045

HI sir

I use the DAC1612997 For 4-20mA output is ok, when power loop is from external power supply

but if i want to use the USB power to supply the 24 v, did you have any suggestion?

need a isolator power & digital isolator between PC & DAC1612997

thanks

0 Lucas Burnette over 1 year ago

Hi,

TI has a large selection of boost converters that could serve your needs.

Here is a possible one:
https://www.ti.com/product/TPS61045

You can also sort through TI's products to compare costs and other parameters:
https://www.ti.com/power-management/non-isolated-dc-dc-switching-regulators/step-up-boost/products.html#sort=p634max;desc

The DAC161S997EVM uses this isolator and there are similar isolators with different specs if needed.
https://www.ti.com/lit/ds/symlink/iso7220c.pdf

Let me know if you have any questions,

Lucas

0 Chen Alex1 over 1 year ago

Expert 2315 points

I mean When use the external 24 v power for the DAC161S997 to do power loop for 4-20mA work is ok

but use the internal 24 v for DAC161S997, the current control is fail

if I need use self-power for DAC1612997, did you have any advise?

thanks

0 Paul_Frost over 1 year ago in reply to Chen Alex1

Lucas is reviewing this now.

0 Lucas Burnette over 1 year ago in reply to Paul_Frost

Hi,

To understand your question, do you mean you are looking to use your 5 V USB to get a 24 V output using an on board power supply?

Thanks,
Lucas

0 Chen Alex1 over 1 year ago in reply to Lucas Burnette

Expert 2315 points

yes

0 Lucas Burnette over 1 year ago in reply to Chen Alex1

Hi,

The TPS61045 I mentioned earlier has an input voltage of 1.8 - 6 V and outputs up to 28 V. Does this fit your needs?

Thanks,
Lucas

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