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TPS563201: Could you tell me about difference of TPS56x200/1/8/9 series function ?

Pokkun
Genius 4695 points
Part Number: TPS563201
Other Parts Discussed in Thread: TPS563200

Hi, team.

My customer is tring to use TPS56x20x seriese devices at TV application.

Therefore, since I was asked by the customer about the function of this device,I want you to tell me.

Can you please help me?

＜Question＞

①-1: Please tell me about Non-latch OVP function.

In this function, when the output (target) voltage becomes 125% or more,

it is switching is temporarily stopped without latching.

my consider is OK?

①-2: Is it correct as below to distinguish existence of Non-latch OVP function from TPS 56x200 / 1/8/9 series? (If it is not correct, I'm happy if I can receive a correction comment.)

· TPS56x200/9: Switching temporarily stops due to output overvoltage detection.

· TPS56x201/8: No output overvoltage is detected and output is adjusted by fixed ON time control.

②: When considering this product by design, is there a need for a snubber circuit?

(Please tell me if it is safer to prepare the pattern even if it is not necessary,too.)

Best regards,

Masumi Sekiguchi.

  • 0
    TI__Expert 4875 points

    Hi Sekiguchi-san,

    As far as I know, for TPS56x20x, during OVP, the low side FET will continuously on until FB voltage below reference. It is a non-latch function. I will need to double check in the lab. In most case, snubber is not necessary. Using snubber could reduce EMI. Thanks!

    Best,

    Anthony

  • 0 in reply to Anthony Lang
    Genius 4695 points
    Thank you very much, Anthony.

    >As far as I know, for TPS56x20x, during OVP, the low side FET will continuously on until FB voltage below reference. It is a non-latch function.

    Are all series products the same topology?

    ※Because, I'm comparing the data sheets of all series products,
    there are things with and without description about OVP.

    Best regards,
    Masumi Sekiguchi.
  • 0 in reply to Pokkun
    TI__Expert 4875 points
    Hi Sekiguchi,

    Yes, we did some changes on datasheet from TPS563200/09 to TPS563201/08. Since DCAP2 devices will turn low side FET on when OV until OV removed, we decided to not specially explaining OVP function on 01/08. The DCAP2 control mode will work when OV to discharge the output cap and also prevent runaway current.

    Best,
    Anthony
  • 0 in reply to Anthony Lang
    Genius 4695 points
    Thank you very much, Anthony.

    I'm sorry for frequent questions.
    In order to explain to the customer, please tell me until I'm understanding.

    What is non-latching UVP / OVP ....
    ※In other words, is the OVP / UVP comparator running just for FB control?
    　Is the answer Yes or No?

    (If its answer is No ....)
    What is the difference with internal PWM comparator?

    Best regards,
    Masumi Sekiguchi.
  • 0 in reply to Pokkun
    TI__Expert 4875 points

    Hi Sekiguchi-san,

    Yes, just for FB control. The internal PWM comparator is used to implement DCAP2 control mode. The UVP/OVP comparator is comparator to interrupt PWM comparrator signal during UV or OV and let device enter protection mode. Thanks!

    Best,

    Anthony

  • 0 in reply to Anthony Lang
    Genius 4695 points
    Hi, Anthony-san,

    If it is controlling with only the internal PWM comparator,
    At what situation does the UVP / OVP comparator operate?

    Best regards,
    Masumi Sekiguchi
  • 0 in reply to Pokkun
    TI__Expert 4875 points
    Hi Sekiguchi-san,


    The PWM comparator, UVP and OVP comparators are three different internal comparators. They all have FB for their input. I think I misunderstand your question before. The internal PWM comparator is used to implement DCAP2 control mode. The UVP/OVP comparator is comparator to interrupt the gate driver signal during UV or OV and let device enter protection mode. They are three different comparators which output different control signal to control the gate of MOSFET. Thanks!

    Best,
    Anthony