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LM5175: Battery power protection

sakthi vel
Prodigy 160 points
Part Number: LM5175
Other Parts Discussed in Thread: LM7481-Q1

Hello there,

please find the simple power flow diagram of our Automotive part, where power from battery directly connected to buck boost regulator "LM5175" or "LM2511" for our system, in that we are having few queries regarding battery power protection, 

1, What kind of input power protection circuits required for our product ?

2, We got to know while engine turns ON or OFF around 8V Alternating voltage may get super imposed on the power supply can we directly connect the supply to the regulator?

3,If the mentioned regulators are not suitable for the application please suggest any alternate parts,

4, What kind of ISO test standards should be followed ?

Thanks,

Sakthivel,

  • 0
    TI__Guru 65170 points

    Hello Sakthivel,

    1. This is dependent on your application and you need to define this.

    2. Generally you can connect both devices to inputs that are not stable. If the input alternates a lot, you might observe some voltage changes on the output or worst case it could get instable, but with good design, this is possible with both devices.

    3. From the few information you mention, it seems they can be suitable.

    4. This is dependent on your application and I do not know.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Prodigy 160 points

    Hello Brigitte,

    Thanks for your support,

    We found the part "LM7481-Q1," which is an active bridge controller used for suppressing the superimposed alternating voltage at the 12 V battery input. Is it necessary to use part or can we bypass the rectifier and connect the power directly to the "LM5175" regulator? 

    Thanks,
    Sakthivel

  • +1 in reply to sakthi vel
    TI__Guru 65170 points

    Hello Sakthivel,

    You need to stay within the voltage rating of the device and if this is the case, you can connect it directly to the IC.

    Best regards,
    Brigitte

  • +1 in reply to Brigitte
    TI__Guru 65170 points

    Hello SAKthivel,

    As we did not hear back from you, I expect the problem is solved and will close the thread now. If there are further questions, please post below or start a new thread.

    Best regards,
    Brigitte