UCC29002: UCC29002 with LEM HAIS 200-P Current Trasducer

Hello Ravi

I am not aware that TI has done any work with Hall effect sensors but I have used them in a previous employer so I'm comfortable to give some advice.

1/  The Sensor requires a bias supply, labelled +Vc on the datasheet. Please make sure that this supply is not affected by a short circuit on the PSU output. Otherwise you will lose current sense information at the very time when the current is highest - a resistor current sense is not affected in this way of course. The best thing to do would be to use the same supply rail as you use for the UCC29002

2/ The 1% error really refers to the basic performance of the UCC29002 and is normally dominated by the input offset voltage of the current sensing amplifier. There are additional error sources such as component matching - the resistors at the CS+ and CS- pins affect the gain for example. The controller will give as accurate results with a Hall sensor as with a resistive sensor BUT you do need to know where the error terms are generated - the aforementioned CS+ and CS- resistors for example. Do also note the basic accuracy of the Hall effect sensor you are looking at is 1% so I would advise - as I would if you were using a current sensing resistor - to carefully draw up an error budget and see if it meets your requirements.

3/ Hall effect sensors measure the magnetic field that they are exposed to - normally this is dominated by the magnetic field of the current in the wire being measured. But they do also pick up a small contribution from other magnetic fields - the earths magnetic field for example can cause a significant change in their output as the sensor is rotated 90deg (I found this out the hard way !) - make sure that all the sensors in the group are oriented in the same direction

Other than that - a Hall Effect sensor should be fine.

Regards
Colin