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TSC888A gain is low

Question asked by schimandle.john on Jan 2, 2013
Latest reply on Jan 6, 2013 by Boimond.Anthony
I'm using the TSC888A current sensing amplifier in BLDC (brushless DC) motor controller current limit circuit. I'm seeing a gain of about 10 from the amplifier instead of the published typical value of 20. The data sheet does not specify a min or max gain but does state an output accuracy of 6%. With a 0.05 ohm series resistor and 1.2A current I am seeing an output voltage of 650mV. According to my calculations I should be seeing 1.2V (1.2*0.05*20).

Vcc and Vp are both connected to same 12V power bus.

Has anyone else seen this problem?