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Original question:

TPS43060: Boost Solution for 12-24Vin, 8A Iout @ 30V

TPS43060: Question about TPS43060

Frank Cai
Intellectual 1425 points
Part Number: TPS43060
Other Parts Discussed in Thread: LM5122

Tool/software:

Hi Team:

My customer is now evaluating TPS43060, could you please help to check the following questions? Thanks.

1. Can we observe the CBC current limit protection through 

2, Is it possible for TPS43060 to work in bypass mode? Vout=Vin? If so, is the duty cycle 100%?

3, if TPS43060 output voltage is higher than input voltage, will it lead to some internal protection to prevent this case?

4, Do you have some document which describe the how TPS43060 co-work with power amplifier load?

Sincerely

Frank

  • 0
    TI__Mastermind 19595 points

    Hello Frank,

    Thanks for reaching out to us via e2e.

    I am very busy right now, so I will come back to you latest tomorrow.

    Best regard
    Harry

  • 0 in reply to Harry Hofner
    TI__Mastermind 19595 points

    Hello Frank,

    I guess I will need some more details to answer most of your questions.

    1. Can we observe the CBC current limit protection through
    Is this a full sentence which I just don't understand, or are some words missing at the end of it?
    ... through what?

    2, Is it possible for TPS43060 to work in bypass mode? Vout=Vin? If so, is the duty cycle 100%?
    The TPS43060 does not support that mode where the high-side FET is on for 100% of the time.
    Please use the LM5122 or the LM5123 for that purpose.

    3, if TPS43060 output voltage is higher than input voltage, will it lead to some internal protection to prevent this case?
    The TPS43060 will just stop switching in this case.
    All load current will go across the body diode of the high-side FET.

    4, Do you have some document which describe the how TPS43060 co-work with power amplifier load?
    Are you talking about an AUDIO amplifier with dynamically changing load?
    Do you expect the boost stage to adjust the output voltage according to the requirement of the amplifier?

    Thanks and regards
    Harry

  • 0 in reply to Harry Hofner
    TI__Intellectual 1425 points

    Hi Harry,

    Thanks for the comments! and sorry for the missing part in sentence.

    1. Can we observe the CBC current limit protection through capture some pin waveform? Like SW or another pin?

    4. Are you talking about an AUDIO amplifier with dynamically changing load? Do you expect the boost stage to adjust the output voltage according to the requirement of the amplifier? 

    • Yes, since the voltage is changing during audio amplifier operating, do you have some circuit recommendation like a voltage follower, which can apply on LM43060 to realize a dynamical Vout change.

    Sincerely

    Frank

  • 0 in reply to Harry Hofner
    TI__Intellectual 1425 points

    Hi Harry,

    Adding one more question,

    • Do we have more detailed description about LM43060 CBC current limit protection? Such as how it work and how many circle will it detect. I don't see too much description in this function

    Thanks.

    Frank

  • 0 in reply to Frank Cai
    TI__Mastermind 19595 points

    Hello Frank,

    A Class-H amplifier requires a special amplifier which delivers a look-ahead signal,
    The booster needs to increase the supply voltage BEFORE the amplifier will need it, otherwise your audio will always get clipped.

    The TPS43060 is not meant for such an application.
    We would recommend using the LM5123 (with Tracking signal) or the LM5122 (with voltage divider, where you can feed the signal from the amplifier via resistive adder network).

    Please have a look at the LM5123 based Class-H reference design:
    https://www.ti.com/tool/TIDA-020033


    >> Do we have more detailed description about TPS43060 CBC current limit protection? Such as how it work and how many circle will it detect. I don't see too much description in this function

    In case of the TPS43060 there is no real (additional) protection mechanism.
    The controller is using a Peak Current Mode Control loop.

    It first turns on the low side FET. Dependent on the inductance, the current through inductor and low side FET will rise.
    How does the controller know when to turn off? It does NOT use the "nominal" duty cycle.
    It will turn off, when the voltage on the current sense resistor exceeds the threshold.
    Due to the slope compensation ramp it will actually be a bit lower.
    So, in the end it is the current sense resistor which defines the peak current through the inductor.

    >> Can we observe the CBC current limit through capture some pin waveform?
    You can use a current probe to measure the current through the inductor.
    This will show you at which current the low side FET will get turned off.

    Best regards
    Harry