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Original question:

TMS320F28377S: Signal pin during power sequence

TMS320F28377S: Recommended power circuit

Sh.Sasaki
Guru 13625 points

Part Number: TMS320F28377S
Other Parts Discussed in Thread: TPS62420, TMDSCNCD28379D, C2000WARE

Hi experts,

Is there a recommended power supply circuit that meets the following requirements?

The circuit diagram of LaunchPad converts 1.2V from 3.3V as follows.
However, I wasn't sure if this circuit could meet the specifications of the data sheet, because the protection diode was not connected.

Please let me know if there is a recommended power supply circuit.

Best regards,

Sasaki

  • 0
    TI__Mastermind 45606 points

    Hi Sasaki,

    I believe you pasted the wrong requirement from the datasheet. Can you verify and re-post the section your concerned about?

    Maybe the below?

    I believe the LaunchPad power supply circuit should meet this requirement, but I can dig a little more just to double check. You may also want to look at the circuit used in the ControlCard. It uses step down converter TPS62420 for 5V --> 3.3V and 1.2V.

    C:\ti\c2000\C2000Ware_3_01_00_00\boards\controlCARDs\TMDSCNCD28379D\R1_3

    Best,

    Kevin

  • 0 in reply to Kevin Allen18
    Guru 13625 points

    Hi Kevin-san,

    Thank you for your reply!

    Kevin Allen18 said:

    I believe you pasted the wrong requirement from the datasheet. Can you verify and re-post the section your concerned about?

    Maybe the below?

    I made a mistake. The following is correct.

    Kevin Allen18 said:

    I believe the LaunchPad power supply circuit should meet this requirement, but I can dig a little more just to double check. You may also want to look at the circuit used in the ControlCard. It uses step down converter TPS62420 for 5V --> 3.3V and 1.2V.

    C:\ti\c2000\C2000Ware_3_01_00_00\boards\controlCARDs\TMDSCNCD28379D\R1_3

    I got it.

    Let me reconfirm the following.

    Is this circuit a recommended circuit to meet this regulation?

    Best regards,

    Sasaki

  • 0 in reply to Kevin Allen18
    Guru 13625 points

    Hi Kevins-san,

    Do you have any comment?

    Best regards,

    Sasaki

  • 0 in reply to Kevin Allen18
    Guru 13625 points

    Kevin-san,

    This issue has been resolved.

    We believe that the power circuit of the ControlCard can satisfy the power down sequence.

    In addition, I think that it is better to divide the EN2 of TPS62420 by a resistor.

    Best regards,

    Sasaki