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DRV2700EVM-HV500: How to output 1000V using two EVMs

Kota
Prodigy 125 points
Part Number: DRV2700EVM-HV500

Hi team

We are considering 1kV output using two DRV2700EVM-HV500. The load is a piezo driven by 1kV.

I floated the GND, shared the PWM signal, and created a virtual GND, but it didn't work.

It will be controlled to 500V by the FB pin.

How can I output 1kV? Is it impossible?

I appreciate your great help in advance.

Kota

  • 0
    TI__Guru* 84915 points

    Hi, Kota,

    Unfortunately, the DRV2700EVM-HV500 is designed for a max output of 500V only.

    In order to reach the 1KV settings, all the output voltage network must be redesigned and the components must be replaced. The components that this board has can only support a max output of 500V (some of them can reach 630V max). So, you would need to get components with at least the double of supported voltage (see the Bill of Materials section for details:  http://www.ti.com/lit/ug/slou407a/slou407a.pdf#page=22 ).

    In addition, the best way to reach the double of voltage would be replacing the R9 and R23 resistors of the output voltage selection network for the double value. In other words, you would need to replace R9 for a 2Mohms resistor and R10 for 2.1Mohms resistor. This will allow to reach the double of voltage at the output. Again, it is important to ensure that all the components in the flyback circuit network supports this high voltage.

    Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.