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TPS65987D: 5 PDO is used with LM5176, how to calculated the feedback resistor based on truth table PDO control

user021864
Intellectual 2145 points
Part Number: TPS65987D
Other Parts Discussed in Thread: LM5176

Hi, 

My customer is using TPS65987D with LM5176. Because we need 5 PDO totally, 5, 9. 12, 15, 20V 

We will need to use truth table control for the power converter feedback. 

But the feedback resistor is hard to calculate and meet this request, can you help to provide us the equation of calculation? 

I am also wondering if we are able to use another AND gate to control an extra feedback resistor to connect into the feedback of power converter when 15V is require at the PDO( 011 at truth table) 

Do you think the delay will be the problem of getting PDO ready? 

Please let us know you comment about how to configure the feedback control of LM5176 from TPS65987DDH. 

Thanks for your help.