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TL3472: zero drift parameter

Part Number: TL3472

Hi team, 

When my customer use TL3472 for over current protection, they found at high current the drift of amps is too much and reaches the OCP limit, while during lab test, they only do fuction test with light load so this drift is not that obvious.  See below description:

When cap - and DC1 - are both 0V, the theoretical values on pins 2 and 3 should be 103mv, and the output IDC should be 1.65v.

However, the voltage of pin3 of the actual failure chip is 103mv, while the voltage of failure chips with pin2 voltage occurs 111mv, 105mv and 105mv, and the output IDC  are 1.78v, 1.525v and 1.524v. The drift is too large, resulting in inaccurate sampling and false alarm of over-current.

Could you please help what can cause  this big drfit as i didnot see any description on datasheet (it seems quite old), and what suggestion for customer? 

Checked with customer high humidity/high temperture environment will not occur in their product application.

Best Regards