I have used this current sensor.
The Allegro current Sensor in small quantities cost around 6 to 8 dollars.
For the 200 Amps, 100 amps measurement represents 1 volt out.
For some design cases, this voltage may require amplification for other circuits to operate with the necessary parameters.
The Amplifier needs good reference USING the regulated 5 volts from the Allegro I.C.
It has a frequency limitation as 35 KHZ, though it should be used at around 20 - 25 Khz as a maximum, for easy use without a complicated frequency response design.
One problem is the soldering of the current sampler "rod".
We do Silver solder with a cooling pad on the i.c. epoxy plastic to reduce temperature effects and the soldering heater has a very fast temperature recovery time for fast.
The Rod is too short, unhappily, and they should have one with eyelets for easy mounting in some cases.
Nando