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TPS92691: Low Side Buck

tateo yamashiro
Guru 10890 points
Part Number: TPS92691

Hi,

We got a question from the customer about TPS92691.
Could you help us?

[Question]
They are considering using TPS92691 for the following condition.

 Vin=45 to 52V
 Vout=30 to 39V
 Iout=3.2A max
 LED Open fault output is needed

They are interested in Low Side Buck circuit by TPS92691. Is there any reference design and Excel calculator?

Best Regards,
tateo

  • 0
    TI__Mastermind 25500 points

    Hello Tateo,

    I will have to check with the responsible engineer when he is back next week, but I do not believe there is a calculator or reference design for the buck configuration. But many of the equations are the same and the ones that are not are pointed out in the datasheet. They are pretty easy to follow step by step. I could help out with them if needed, but I would need a lot more information. Let me know.

    Thanks,

    Clint

  • 0 in reply to Clinton Jensen
    Guru 10890 points

    Hi, Thank you for your quick reply. Could you provide the recommended schematics under the following condition?

    Vin=45 to 52V
    Vout=39V
    Iout=3.2A
    fsw=500kHz
    PWM and Analog Dimming
    LED Open fault output is needed

    I would appreciate it if you could provide the schematics.

    Best Regards,
    tateo

  • 0 in reply to Clinton Jensen
    Guru 10890 points

    Hi, Sorry for bother you again. We got additional question. Could you confirm it?

    They are considering OVP status output by using IMON pin. When the IC is under the PWM dimming operation, which the behavior of IMON output will be, DC voltage or PWM waveform? If the IMON output is PWM waveform, they have to reconsider the circuit.

    Best Regards,
    tateo

  • 0 in reply to tateo yamashiro
    TI__Mastermind 25500 points

    Hello Tateo,

    IMON will follow the LED current so when you are PWM dimming it will be a PWM waveform. You will need to follow the datasheet equations if you still pursue this design. It's application specific so I do not know what parameters you need to design around.

    Regards,

    Clint