TDA2SG: TDA2 power supply

user3378603

Intellectual 1000 points

Part Number: TDA2SG
Other Parts Discussed in Thread: TDA2

Hi，

We are not using the USB function of TDA2

What will happen if we turn off this power supply of TDA2 after the SOC completes the power-on sequence?

VDDA33V_USB1 & VDDA33V_USB2

over 5 years ago

0 kcastille over 5 years ago

TI__Guru 54352 points

Hello,

You should not turn off that power supply. Turning it off can damage the SoC.

Regards,

Kyle

0 user3378603 over 5 years ago in reply to kcastille

Intellectual 1000 points

Hi，Kyle

Another question:
The PMIC power to the MPU through SMPS1 and SMPS2. Under normal circumstances, the port SMPS should continue to output 2MHz switching waveform, but sometimes we find that the switching frequency is stagnant, as shown in the figure ：

We are worried that this method will affect the RE, so I would like to consult which PMIC registers can be improved or optimized？

0 kcastille over 5 years ago in reply to user3378603

TI__Guru 54352 points

Hello,

Where are you probing for that waveform ... can you show both SMPS1 and SMPS2 waveforms separately?

Thanks,

Kyle

0 user3378603 over 5 years ago in reply to kcastille

Intellectual 1000 points

Hi，Kyle

The test points and oscilloscope waveform are as follows：

Thanks,

0 kcastille over 5 years ago in reply to user3378603

TI__Guru 54352 points

Hello,

That's expected operation. Here is a quote from the PMIC Datasheet:

In dual-phase configuration the two interleaved synchronous buck regulator phases with built-in current sharing operate in opposite phase. In triple-phase configuration the three interleaved synchronous buck regulator phases with built-in current sharing operate 120° out of phase. For light loads, the converter automatically changes to 1-phase operation.

Regards,

Kyle

0 user3378603 over 5 years ago in reply to kcastille

Intellectual 1000 points

Hi，Kyle

What kind of damage may occur to SOC? Is it possible that the SOC power consumption is abnormal?

Which document describes this content?

thanks

0 kcastille over 5 years ago in reply to user3378603

TI__Guru 54352 points

Hello,

Can you summarize the background for your question? Are you wanting to intentionally turning off that supply and why? Or is it some type of system fault that leads to that supply turning off?

Thanks,

Kyle

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TDA2SG: TDA2 power supply