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UCC28910: Could you tell me about UCC28910?

Pokkun
Genius 4695 points
Part Number: UCC28910
Other Parts Discussed in Thread: UCC28C41

Hi-team.

I am promoting UCC28910 for applications of smart meters and electronic breakers.

At that time, could you tell me the following questions?

<Question>

· Is there a case of destruction when 1000 V (pulse) is applied to the voltage of before UCC28910 Smoothing circuit?

<Additional notes>

- Although my customer adopted UCC28C41 the past, it has been destroyed in the same case, so customer is concerned it.

· Although the varistor and the surge absorber are also put in the input part of the power supply, but We are asking the case of the surge voltage could not be clamped with them.

Could you help me?

Best regards,

Masumi Sekiguchi

  • 0
    TI__Guru* 76315 points

    Hello Masumi,

    The UCC28910 IC’s Vdrain pin is rated 700V maximum.  If this pin see’s greater than 700V it will destroy the IC.

    You might consider adding a MOV to the input to suppress the 1000V transients. The following link will give you an example of MOV that would be used for a 250V application.

    https://www.digikey.com/product-detail/en/bourns-inc/MOV-07D391KTR/MOV-07D391KTRTR-ND/2407592

    To give some added protection it may be beneficial to add an Xcap/Metal film capacitor in parallel with the MOV. This will help absorb the 1000V surge.  The following link will get you to capacitor that could be used.

    https://www.digikey.com/product-detail/en/cornell-dubilier-electronics-cde/715P15256JD3/338-3443-ND/3906649

    You also should place close attention to your layout. Make sure that traces have the appropriate crepedge and clearance to ensure that voltages don’t break down between traces or isolation barriers.

    Primary to secondary you should have 8 mm separation, however if an air gap is used this distance can be cut in half (4 mm).

    For distances between traces you can use your components on the board as guide. As an example a 805 resistor is rated for 150V working voltage and 300V maximum over voltage.  The distance between the pads of the resistor can be used as guidance as the trace distance to meet the 150V/300V voltage stress requirements.

    Regards,

    Mike