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TIDA-010070: Parallel schottky for speculated reverse voltage protection across polarised capacitors

Monis Raza
Prodigy 10 points
Part Number: TIDA-010070

I am a beginner in hardware design with zero industry experience, trying to figure out things from first principle. With that being said, why are these two schottky diodes added in parallel to the polarised capacitors? I understand the diodes are placed in shunt configuration to provide safe path for the reverse current in case there is event of reverse polarity. However, C1 and C2 are polarised capacitors and will that reverse polarity not damage them? Moreover if we have already included LM5050 for reverse polarity and reverse protection what is the need of these shunt diodes?

  • +1
    TI__Expert 3580 points

    Hello!

    Thank you for your interest in the TIDA-010070 reference design. 

    I agree with you that that the design has reverse voltage protection with LM5050 and I neither see a need for the Schottky diode D2.

    I have contacted the designer of TIDA-010070 and will get back to you with his response.

    Regards,
    Martin Staebler

      

  • 0 in reply to Martin Staebler
    TI__Expert 3580 points

    Hello!

    D2 was only added only for internal test and debug and is not required with the final circuit.

    The TIDA-010070 schematic prints Schematic — TIDA-010070D2 shows not populated already,  please see below picture. It's a typo in the design guide and should have been not-populated in the design guide too. 


    Thank you for catching this!

    Regards,

    Martin Staebler