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TPS51385: Looking for Buck Regulators with OOA

user4991603
Prodigy 170 points
Part Number: TPS51385
Other Parts Discussed in Thread: TPS564255, TPS65265, TPS62933O

Tool/software:

Hello,

do you have a complete list of Buck Regulators that support OOA?

In my case I need a regulator that supports an input voltage of 12V and can output 5V and 9V at a maximum of 1.5A or 1A. 

I also need 3.3V but as I need 4A max I will probably stick to the TPS51385 if you don't have a another suggestion.

Would it be advisable to use the TPS51385 for lower current applications? Its price seems to be very good. 

Best regards,

Stephan

  • 0
    TI__Genius 17540 points

    Hi Stephan,

    Aurora is out of office this week, the reply will be delay. You can check if TPS564255 can meet your requirement. Thanks.

  • 0
    TI__Genius 17080 points

    Hi Stephan,

    The input voltage of the device should be larger than 20V right? If so, I think TPS51385 is suitable for this application. If you can accept lower input voltage, TPS564255 is also suitable. Thanks.

    Aurora

  • 0 in reply to Aurora Tie
    Prodigy 170 points

    Hi Aurora,

    the regulators are all supplied by 12V. 

    I had a look at suitable regulator today and I also found the TPS65265 which would be an interesting candidate to replace the regulator for the 3.3V(4-5A max), the 5V(1A max) and the 9V(1A-1.5A max).

    The only thing I couldn't find is the maximum recommended output voltage.

    And I also wonder how FCCM works because at the moment we experience a problem with DC-DC-regulator that produce short bursts in low load conditions that couple into a loudspeaker as audible noise through an unshielded inductor that we cannot change. 

    If FCCM is actually working with a more or less constant frequency that would be totally fine for use even if the efficiency is lower. 

    Regulator with OOA so far:

    - TPS564255

    - TPS62933O

    Most of the regulator I found had the problem that the recommended maximum output voltage rating is too low as I also need a 9V rail.

    For the TPS51385 it is not very clear to me why a maximum output voltage of only 5.5V is recommended.

    Best regards,

    Stephan

  • 0 in reply to user4991603
    TI__Genius 17080 points

    Hi Stephan,

    For your questions, pls see my below answer:

    1. Most of MVB's products use two control methods: D-CAP and Current Model. Due to the compensation network inside the chip, the D-CAP control method has certain restrictions on the output voltage to ensure stability. The loop of Current Mode is different from D-CAP, and the output voltage range is relatively wider.

    2. For TPS65265, the max Vout is 15V. Pls see the product folder for more details.

    3. FCCM is generally a light load mode of chips using current mode control. This mode means that the chip will not reduce the frequency under light load conditions, the inductor current is allowed to reverse, and the chip continues to work at the set frequency.

    Hope these are helpful. Thanks.

    Aurora

  • 0 in reply to Aurora Tie
    Prodigy 170 points

    Hi Aurora,

    thanks for your answer. Regarding FCCM would you recommend using it in an environment that uses some audio circuits?

    Best regards,

    Stephan

  • 0 in reply to user4991603
    TI__Genius 17080 points

    Hi,

    I think you can use FCCM for your application. Thanks

    Aurora