IR2175 current sensor

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The IR2175 is a monolithic current sensing IC designed for motor drive applications. The output is a pwm signal and current measurement can be done from pwm duty cycle calculation. I did some experiments with IR2175, but the output does not vary linearly with input current and there are some problems with negative currents.
Has anybody experience with IR2175?

http://www.irf.com/product-info/datasheets/data/ir2175.pdf
http://www.irf.com/technical-info/appnotes/an-1052.pdf

Ozhan KD
Knowledge is POWER