ACS725 Hall sensor output is weak?

[cupoftea]

Hi,
The ACS725LLCTR-30 has a max loading to its signal output of 4.7k......so no more than approx 1mA can flow out of its VIOUT pin.
As such, do you agree, this could limit its ability to slew the compensation network of a connected opamp integrator?
As such, woudl you agree, its best to put an opamp buffer at its signal output (VIOUT)?

ACS725LLCTR-30AU-S

https://www.digikey.com/en/products/detail/ACS725KMATR-30AB-T/ACS725KMATR-30AB-T-ND/6167403?curr=usd&utm_campaign=buynow&utm_medium=aggregator&utm_source=octopart

 

[betwixt]

4.7K is the minimum load resistance but doesn't necessarily mean it can only provide 1mA, its the value beyond which the output may not meet guaranteed specification. Whether or not it needs a buffer stage depends upon the design of your integrator circuit.

Brian.

 

[KlausST]

Hi,

An opamp integrator has a resistor a input and a capacitor in feedback.
As long as the input resistor is >= 4k7 everything is O.K. ....the fedback does not matter at all.

Klaus