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XTR305: Cc(Compensation capacitor)

Kuramochi Tadahiko
Guru 28715 points
Part Number: XTR305

Hi,

How should we calculate Cc(Compensation capacitor) value?

Best Regards,

Kuramochi

  • 0
    Guru 140200 points

    Hi Kuramochi,

    find the correct value of Cc with the empirical method discussed in section 8.2.2.6 of datasheet.

    Kai

  • 0 in reply to kai klaas69
    TI__Mastermind 49455 points

    Hi Kuramochi,

    The procedure to estimate the compensation capacitor is discussed on section 8.2.2.6.

    Is the device used in Current mode or voltage mode?

    Essentially, in current output mode, loop compensation is not critical, even for large capacitive loads. However, in voltage output mode, the capacitive load, together with the source impedance and the impedance of the protection circuit, generates additional phase lag. The IA input might also be protected by a low-pass filter that influences phase in the closed loop.  There is an XTR305 TINA model available on the web that could be used to assist/ perform stability analysis for the XTR305. 

    XTR305 TINA Spice model:

    http://www.ti.com/product/XTR305/toolssoftware

    If you require additional assistance, please provide the complete schematic, including the XTR305 load impedance and source impedance characteristics  and the XTR305 settings (voltage mode or current mode), and we could advise/support.

    Thank you and Regards,

    Luis  

  • 0 in reply to Luis Chioye
    Guru 140200 points

    Hi Kuramochi again,

    in a standard application the circuit of figure 40 is recommended. And if an output protection is needed, add the diodes from figure 46.

    Kai