Other Parts Discussed in Thread: TPS65218, , TPS65218EVM-100
Hi team,
Do you have any data on start up time for DCDC, LDO, and LS?
The customer is concerned if they are going to rise too quickly without soft start.
Best Regards,
Kei Kuwahara
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Hi team,
Do you have any data on start up time for DCDC, LDO, and LS?
The customer is concerned if they are going to rise too quickly without soft start.
Best Regards,
Kei Kuwahara
Hi Kei,
We are currently experiencing high support volumes. I'll provide an update within the next 2 business days.
Regards,
James
Hi Kei,
We have an evaluation module for this PMIC family located here: TPS65218EVM-100
This device can be programmed to match the voltage outputs and sequencing of the TPS6521855. If you are using the TPS6521855 with the AM64x processor, then know that the PMIC is specifically designed to work with the processors power needs and timings. However, you can directly measure the waveforms and see if they fit your needs.
If you decide to use the TPS6521855, I suggest that you follow TI's recommended specifications in the datasheet and the application note for powering the AM64x that I will link below. Deviating from the specifications may create issues without proper testing.
Application Note on powering AM64x
Regards,
James
Hi James,
Thank you for your suggestion.
However, we don't have the EVM.
I would like to know whether TPS6521855 has soft start function or not.
If it has, then could you tell me the rise time for the soft start?
Best Regards,
Kei Kuwahara
Hi Kei,
The TPS6521855 does not have any explicit soft start functionality, but I went and grabbed some scope captures from our TPS65218EVM-100 board. This board has the recommended external components and shows the expected start up times for the power rails. I captured the waveform for DCDC1, DCDC3, LDO1, and LS1. The power rails are shown below in the order I have listed.
DCDC1: ~2ms
DCDC2: ~2ms
LDO1: ~300us
LS1: ~90us
Regards,
James
Hi, James,
Thank you very much for measuring the power rails for me!
This helped me a lot!
Best Regards,
Kei Kuwahara
Hi Kei,
My pleasure. If you have any other questions let us know here on the forums!
Regards,
James