TPS2546: TPS2546 charging current measurement

Nic Lin

Intellectual 2020 points

Part Number: TPS2546

Hi Team,

Do we have any specific tool to measure the TPS2546 charging current? For example, how can we make sure that TPS2546 can output 2A current? Can we do that on the EVM?

Regards,

Nic

over 7 years ago

0 Donovan Porter over 7 years ago

TI__Intellectual 1920 points

Hi Nic,

It can be done with the EVM. Set the TPS2546 to be in DCP auto (or really any DCP mode) and connect a power resistor decade box (or some adjustable load). I connected the load to the VBUS test point and the GND test point closest to the VBUS test point. Make sure to power the EVM from it's own power supply as well. I was able to do around 2.5A before the fault LED turned on.

Thanks,
Donovan

0 Donovan Porter over 7 years ago in reply to Donovan Porter

TI__Intellectual 1920 points

Hi Nic,

Here is another option.

Connect 5V to VIN and GND, make TPS2546 enabled.
Connect another power supply between VIN and VOUT, adjust the power supply voltage (for example from 0.1V)until its output current not changed, that means TPS2546 is working in current limit mode

Regards,

Donovan

0 Nic Lin over 7 years ago in reply to Donovan Porter

TI__Intellectual 2020 points

Hi Donovan,

Thanks a lot for providing this. If TPS2546 has been built in customer's system, can we measure that using the same method?

Regards,

NIc

0 Donovan Porter over 7 years ago in reply to Nic Lin

TI__Intellectual 1920 points

Hi Nic,

It should be ok granted nothing else in the system is vulnerable to the setup.

Regards,
Donovan

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TPS2546: TPS2546 charging current measurement