TPS54560: Design challenge with 3A load current

Furkan Fehmi Sefiloglu

Part Number: TPS54560

Hi Team,

Can you please check and advise with following request:

We use TPS54560 integrated in our power cards. However, the input voltage in our product is up to 55V due to the battery. When we draw high currents at these voltage levels, the regulator cannot meet our needs. We observe that in some of our products, bottlenecks due to IC occur and there are burning materials.

In our product where we are experiencing difficulties, we determine our Vın value as 55.6V and Vout as 13.7V. Our output current is 3A on average. The IC we mentioned is referred to as 60V Výnex, but it is stated that failures occur under 3A load.

Thanks in advance

Best Regards

Furkan Sefiloglu

over 3 years ago

0 Arief Hernadi over 3 years ago

TI__Mastermind 23815 points

Hi Furkan,

What kind of failure that you have seen?

Is there a schematic for the design?
Also have you tried using the TPS54560B?

https://www.ti.com/product/TPS54560B

The difference can be found in here

https://www.ti.com/lit/an/slvaea1/slvaea1.pdf?ts=1616531409296&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPS54560B

Thanks

-Arief

0 Furkan Fehmi Sefiloglu over 3 years ago in reply to Arief Hernadi

TI__Expert 3118 points

Hi Arief,

Here is the feedback and schematic:

The problem reported to me is that when we enter the regulator from the battery in the state of 55.6V maximum charge, the regulator is broken in case of working with approximately 13.7V output voltage and 3A current value.

Thanks in advance

Furkan Sefiloglu

0 Arief Hernadi over 3 years ago in reply to Furkan Fehmi Sefiloglu

TI__Mastermind 23815 points

Hi Furkan,

Is the damage happens during transient or steady state?

Is it possible to capture of the VIN voltage oscilloscope capture when the part is damaged?

I am concerned with voltage spikes at the VIN pin causing a damage on the part.

If you have a good capture of the failure that will help us too.

The schematic looks ok when i compared it with webench
https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=211F6953B27ACA5E

Thanks

-Arief

Power management

Power management forum

TPS54560: Design challenge with 3A load current