TMS320F280049: What's the difference using internal or external 1.2V power supply circuit

Rayna Wang

Part Number: TMS320F280049

Hi Expert,

Customer confused what's the difference between the internal and external 1.2V power supply, and how to choose a suitable one for their application? For example, if system requires high accuracy and stable of 1.2V supply, they need to use external, otherwise use internal?

I'm not sure, could you help to clarify it for us? Thanks!

Best Regards/Rayna

over 5 years ago

0 Frank Ankapong over 5 years ago

TI__Mastermind 28275 points

Hi Rayna,

Most customers use an external supply because of increased efficiency. The internal LDO is only about 30% efficient and since the majority of the current is consumed on the VDD rail, if efficiency is important to your application, you should consider an external supply.

BTW, the F20049 has an internal DC-DC which offers about 80% efficiency so that is also an option.

0 Rayna Wang over 5 years ago in reply to Frank Ankapong

TI__Expert 3680 points

Hi Frank,

Thanks for your explanation.

As you said, the one difference is the power efficient, customer wonders that is there any other different thing among these three supply ways.

Best Regards/Rayna

0 Frank Ankapong over 5 years ago in reply to Rayna Wang

TI__Mastermind 28275 points

Rayna,

Can you clarify what you mean?

0 Rayna Wang over 5 years ago in reply to Frank Ankapong

TI__Expert 3680 points

Hi Frank,

What I mean is that if there is any other difference between internal and external 1.2V supply except the efficiency?

Thanks!

Best Regards/Rayna

0 Frank Ankapong over 5 years ago in reply to Rayna Wang

TI__Mastermind 28275 points

Rayna,

No, the internal supply is designed to work perfectly fine with the device so the reason customers switch is for increased efficiency.

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280049: What's the difference using internal or external 1.2V power supply circuit