What will be the Feedback resistor Rfb value for Parallel operation 2+1+1

Question

Hi I want to tie VOUT1 and VOUT2 together to get 1V with 8 Amp what will be the FB1 and FB2 value , if I tie together what will be the value. and is there any other pins that I have to tie together for this parallel configuration. 
 Regards, Raju

MStokowski · Accepted Answer

Hi mangaraju , 
 Nice thing about the &micro;Module is that it is very early to set up. If you are using the LTM4644, you only need one resistor per output; with the LTM4644-1, you can use resistor dividers. All, including parallel operation is shown on page 10 of the datasheet. Page 12 shows more about parallel operation. Figure 37 shows an app for 8A @ two outputs. 
 Both parts are supported in LTspice for simulation. 
 mike (LTspice team))

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What will be the Feedback resistor Rfb value for Parallel operation 2+1+1