TPS56A37: Architecture confirmation

Hi Roy

Can you please share more information about your application need? Why do you connect the two VOUT in series and what do we need to provide for the system?

Thanks and best regards.

Hi Gui

This load requires 10V and 1V as the input and output terminals, and I want to generate these two voltages by stepping down 12V using two TPS56A37. The 12V is supplied by a shared input power source.
From my understanding, current flow from 10V to 1V. It means the current will flow into the TPS56A37 that generates 1V. Is there any problem with this configuration?

Hi Hedy

Can you please share what's the 1Ohm load is? I think TPS56A37 should not be used by this way(the 12V->1V part) .

Thanks.

Hi Gui, thank you for your reply.

The load is a panel approximately 30 inches in size. I saw in the datasheet that TPS56A37 can generate 1.05V and I did indeed obtain this voltage on my PCBA.

But when I connected the load to 10V/1V, there was no response. And the 1V was pulled to around 8-9V. Do you have any suggestions for practical use?

Hi, Bella will reply to you later today.

Hi Hedy

The TPS56A37 generate constant voltage that is set by the feedback resistors. Both act as voltage source and two voltage source should not be connected directly.

Thanks and best regards.

Hi Gui

Do you mean that it is not possible to utilize the positive voltage generated by TPS56A37 at the both ends for loading? Is it because of the direction of the current flow? Are there any similar use cases?

Thanks.

Hi Hedy

The buck converter generates a constant vout 1V as below:

When connect the 9A current source, the 9A will charge the Cout of TPS56A37 and the VOUT2 becomes higher than the set value(1V) . The TPS56A37 will not switch. The VOUT2 will charge up to a value close to VOUT1.

Sorry that I haven't seen similar application like this.

Thanks and best regards.

Hi Gui,

I understand now, your explanation is really clear.
Thank you so much for your help.