Part Number:TIDA-00366
But How TL431 is able to generate 5V as VDD1, since the cathode is connected to 16V(or 15V) wrto U_TOP_REF, while the AMC can take maximum 6mA of current, to have 11Volts drop across resistor R72, it must carry 13.4mA current. Not sure how this is functioning to maintain 5V at the VDD1.