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LM5175-Q1: Synchronous Buck-Boost Converter

Ashish Kumar18
Prodigy 30 points
Part Number: LM5175-Q1
Other Parts Discussed in Thread: TPS65131

Hi,

I need to design a buck-boost voltage regulator circuit with below specification:

Vin (min)=8V

Vin (max)=38V

Vout= 24V

Iout= 7A

 

I used TI WEBENCH for the design and simulation. Attaching the link below:

https://webench.ti.com/power-designer/switching-regulator/customize/27?VinMin=8&VinMax=38&O1V=24&O1I=7&base_pn=LM5175-Q1&AppType=None&Flavor=None&op_TA=30&origin=pf_panel&lang_chosen=en-US&optfactor=3&Topology=Buck_Boost&flavor=None&VoltageOption=None

Could you please help me on below queries:

1) can I connect BIAS (Pin-24) to the Output node (Cout) of the regulator circuit ?

2) Number of Input and output capacitors are more, can we reduce the numbers by changing the value to reduce space and cost ? Will it impact the circuit performance ?

3) Any issue or suggestion on the simulated circuit ?

  • 0
    TI__Guru 58225 points

    Hello Ashish,

    When I press on the above link, I am getting interestingly a design with TPS65131.

    1. Yes, you can see this connection in chapter 9.2 in the datasheet.

    2. You mean using capacitors with a bigger capacitance? For ceramic capacitors you should keep in mind that often the ones with bigger values have a bigger DC bias behavior. For other type of capacitors this is normally not a problem. The capacitance is important, not the amount of capacitors.

    3. In general I recommend to compare the result with the quickstart Excel tool result to have a second source. You can find this tool in the product folder in Design Tools and Simulation.