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TPS562208: The precision of the Vref of TPS562208DDCR

Part Number: TPS562208


My customer is testing the reference value of IC and found that the voltage reference value of TPS562208DDCR generally exceeds the nominal reference value of the datasheet. 
Test method: After normal power-on and start-up, use a multimeter to measure the voltage of the VFB pin of the chip and the output voltage. The test results are as follows:

1. Vout= 5.30V, Vfb=0.788V, R202=10.04KΩ,R197= 56.1kΩ

2. Vout= 5.22V, Vfb=0.786V, R202=10.05KΩ,R197= 56.0kΩ

R202 is R2 in the datasheet.R197 is R1 in Figure 8-1 in the datasheet.

I noticed that the customer's test results are still within the range of the datasheet.

My question:

1. Is the customer's testing method wrong? Do you need to consider the influence of ripple?

2. If customers need higher precision equipment, do you have any recommendations?

3. Considering the DC bias caused by the D-CAP2 ripple injection, the error of the voltage reference value, and the feedback error, what is the output range of the circuit under the customer's voltage divider resistor?