ADHV4702 high current output

Hello PPeixoto.  It's hard to answer without some more information.  Can you tell us if you mean 120V peak, or peak-to-peak?  Also, what gain is the ADHV4702-1 used in?  It looks at first glance that the performance you need is a bit beyond the capability of the current booster circuit in the datasheet, but more info will help to make a determination.

Best Regards,

Brian Beucler, Sr. Application Engineer, Analog Devices Inc.

Hello PPeixoto.  It's hard to answer without some more information.  Can you tell us if you mean 120V peak, or peak-to-peak?  Also, what gain is the ADHV4702-1 used in?  It looks at first glance that the performance you need is a bit beyond the capability of the current booster circuit in the datasheet, but more info will help to make a determination.

Best Regards,

Brian Beucler, Sr. Application Engineer, Analog Devices Inc.

Hello Brian
120V peak-to-peak with asymmetrical supply operation;
The gain is 9;
Thank you for your time

Hi PPeixoto,

Since you will be using an external stage, the stability issue will now be determined by the output resistance of this stage. I would suggest one solution - use the first op-amp as an amplifier with gain 9 and the second op-amp together with the power stage as a buffer. You can apply a correction method to a single-gain buffer that separates HF and DC feedback.

Regards,

Kirill

Hello,

If I may add, some information about Capacitive Load Driving are discussed on page 18 of the Data Sheet.

For additional information about Capacitive Load Driving, you may check this link.

https://www.analog.com/en/analog-dialogue/articles/ask-the-applications-engineer-25.html

Thanks.

Hello 
Thanks for the help
@KirV Is that solution increasing the slew rate ? For this aplication is required at least 40V/us.
Can you elaborate on the correction method to a single-gain buffer that separates HF and DC feedback ?

@Fdelaram 
Thanks for info i will look into it.

PPeixoto said:

Is that solution increasing the slew rate ?

First of all, the slew rate is determined by the op-amp. The load current in your case will reach 4 A in the peak. Since the load current will be provided by an external stage, this slew rate is quite possible.

PPeixoto said:

Can you elaborate on the correction method to a single-gain buffer that separates HF and DC feedback ?

You can contact me via private messages to discuss details.

Regards,

Kirill