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OPA569: Paralleling OPA569: max number of devices.

SylvainM
Prodigy 20 points
Part Number: OPA569

Hi,

Datasheet of OPA569 mentions that multiple devices can be set with a "master" device and slave devices connected through 2 paralleling pins.

1) What is the maximum number of devices that could be set in parallel this way ? My application may require up to 10 OPA569 in parallel with signal frequency below 100Hz: is this paralleling method still sensible in that case?

2) Datasheet also mentions "For best performance, keep additional capacitance at the Parallel Out pins to a minimum": are there more specific advice?

Thanks.

  • 0
    TI__Guru* 93105 points

    Hi Sylvain,

    Unfortunately, we don't have any additional information about the paralleling of OPA569 power op amps to achieve higher output current levels. I have not seen an application where anyone has put more than two of them in parallel. I don't have the internal schematics for the OPA569 so I don't know what the Parallel Out pins really are in terms of circuitry. They appear to be an input sense function that is sensitive to both capacitive load and capacitive coupling of large voltage swings as the datasheet suggests. I tend to think that using a power op amp such as the OPA569 to drive external power MOSFETs capable of delivering 10 Amperes of output current may be more direct and thermally manageable than paralleling ten power op amps.

    Regards, Thomas

    Precision Amplifiers Applications Engineering