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TPS40322: About Anti-Cross Conduction of TPS40322

Pokkun
Genius 4695 points
Part Number: TPS40322

Hi, team.

My customers have adapted TPS40322 in prototype,
It is a situation that it can be using even in mass production prototype from now.
(I have heard that no problem has arisen in particular.)

The other day, I was got a question about the following and explained to the customer.

"About what can be thought of when trouble occurs in power line of using TPS40322."

In that case also posted on "E2E", so we posted a link as we interacted.
e2e.ti.com/.../615599

As there are additional considerations about that, please let me ask a question.


"Anti-Cross Conduction" is attached to TPS 40322, please tell me how to control this function.
※ What is being monitored and how is it detected?
※ What kind of processing are you doing?
※ Where are you outputting?

The reason is that both the High-Side FET and the Low-Side FET are turned on by the system (including external FET), and we are worried about whether through current flows.

I want to know the control method also to check whether through current flows by this function.

Best regards,

Masumi Sekiguchi

  • 0
    TI__Mastermind 24075 points

    Hi Masumi,

    The "anti-cross condition" circuit is to ensure there is a dead time between HDRV and LDRV.

    The circuit is detecting both HDRV signal and LDRV signal.

    For example, during HDRV turn off, the circuit monitors HDRV signal and let HDRV falls below a low threshold, wait for a dead time, then starts to turn on LDRV.

    Durign LDRV turn off, the circuit will monitor LDRV signal and turn off LDRV first, wait for a dead time, then starts to turn on HDRV.

    In this way, HDRV and LDRV will not be on at the same time.

    Thanks

    Qian

  • 0 in reply to Qian Chen
    Genius 4695 points
    Thank you for the answer!

    For example, if the HDRV (or LDRV) signal is fixed to ON (or OFF) due to unexpected internal destruction of the IC, will the LDRV (or HDRV) signal be OFF (or ON)?

    ＜Summary of Question ＞
    Has both HDRV and LDRV never been turned ON and protected so that no through current (between VIN and GND) flows by the action of an internal circuit or an external FET?

    Best regards,
    Masumi Sekiguchi
  • 0 in reply to Pokkun
    TI__Mastermind 24075 points

    Hi Masumi,

    The anti-cross circuit is not likely to be damaged. If anti-cross circuit is in work, HDRV or LDRV will be off if the other signal is fiexed to ON.

    In summary, HDRV and LDRV will not be turned on at the same time to avod short through.

    FYI, this part has been released for many years and are being used by many customers in large quantity, so far no customer report short through issue.

    Thanks

    Qian