LM5122: Modular Scalable Interleaved Boost Converter - Advice to sync PWM

I should also mention, I plan to run these modules in solo configurations as well so there will be a jumper to set the external clock or use the LM5122's internal clock. 

Hi Chris,

thank you for using the E2E forum.

Not sure if i understood right, so you would use a dedicated clock generation board for all different input clock or module number setting?

For the power stage: the second MOSFET has both gate series resistor in series. This should be separated so that each MSOFET has its own gate series resistor.

A good resource is also here (in case you have not seen it so far):

Under the Hood of a Multiphase Synchronous Rectified Boost Converter

Best regards,

 Stefan

Hi Stefan, 

Thank you for the response. I have seen the documentation link, thank you. First, I would like to mention the gate resistors are simply jumpers because I can not use vias in my design with an aluminum PCB. I'm open to other ideas for routing the gate signals if you have something; I just happen to have some 0Ω resistors kicking around in a size that allows a decent amount of copper to pass beneath. Next, to simplify my question: is there a better-suited IC like the 4017 which can achieve the sequencing demonstrated in the first schematic? for example, if I have 4 individual units receiving an incoming clock signal of 600khz, each individual unit will output 150khz in sequence so no 2 units will pulse at the same time. I can use the 4017, but it seems like it's going to take up unnecessary space to have so many empty pins because I only need 2 outputs. The space is limited in my design. 

Thank you for your input, 

Chris

For the gate routing, here is the PCB top view. I can not put parts or traces on the bottom. Appreciate any suggestions. Thank you. 

Hello Chris,

As we did not hear back from you, I expect that your issue is solved and I close this thread. Please post below if you have further question or start a new thread.

Best regards,
Brigitte

Hi Brigitte, my question did not get answered, unfortunately. But I went ahead and built my design using the 4017 dividers for the interleaved driver. I should be seeing the jlcpcb order in a few days so its too late to make changes to the pcb now. Thanks for checking in anyways. 

Hello Chris,

Sorry that we did not answer your questions as expected. Please create a new post or post below if new questions arise when you test the circuit.

Best regards,
Brigitte