DRV2700：drv2700 the simulation, the magnification is inconsistent with the instructions

user6304957

Part Number: DRV2700

I am going to do a piezoelectric motor drive, according to the drv2700 instructions to connect the circuit to select parameters in the Tina .But the simulation of the magnification results and specifications are different. I don't know if it's my circuit parameter error or would have been like this. If I set Gain 11 is 40.7 db the conversion multiple is 108 times. But I only simulated 99.93. And I set to 00,01,10 are different degrees of deviation from the specification. Below is my circuit diagram, and the magnification of the simulation test deviates from the actual multiple. Is it my circuit problem? Hope answers.

over 5 years ago

0 Luis Fernando Rodriguez S. over 5 years ago

TI__Guru* 84915 points

Hi,

Welcome to E2E and thank you for your interest in our products!

Could provide details about the Vbst voltage? Could you set the Rfb1 and Rfb2 resistors to get Vbst = 105V? Do you get different results?

Best regards,
Luis Fernando Rodríguez S.

0 user6304957 over 5 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 70 points

Hi,

Thanks for your reply. Below is the details about the vbst. As you can see,it can get vbst=105v,but I still get the same result,VM1=1v,then VOUTDIFF= 97.97v.In order to make you more understand it ,I attach the Tina file for you.

Again thanks for your support. Look forward your reply!3.31.TSC

0 Luis Fernando Rodriguez S. over 5 years ago in reply to user6304957

TI__Guru* 84915 points

Hi,

Thank you for providing the simulation file.

Could you try increasing the VDD level to 5V?

Please let me know how it results.

Best regards,
Luis Fernando Rodríguez S.

0 user6304957 over 5 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 70 points

Hi,
Thanks for your reply. Below is the result. As you can see,when I set vdd=5 and vm1=1v,then Voutdiff=105V. But when I set vm1=1/3v,then Voutdiff still be 105v. The result is pretty abnormal.
Again,thanks for your support!

0 user6304957 over 5 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 70 points

Hi,

Do you have any other suggestions? I still can't let it magnify the same as the instructions. looking forward to your reply.Again,Thanks for your support!

0 Luis Fernando Rodriguez S. over 5 years ago in reply to user6304957

TI__Guru* 84915 points

Hi,

Sorry for my late reply. Regarding the 1/3 V test, have you tested different gains and boost voltage levels in order to compare it with the 1V results? This is to have a better approach to this issue.

Thank you.

Best regards,
Luis Fernando Rodríguez S.

0 user6304957 over 5 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 70 points

Nowadays,I am considering using the DRV2700EVM-HV500 to output a DC stabilized voltage adjustable from 120v to 0v. But when I downloaded the slom404 file from ti official website.Then in Tina simulation, input a stable 460mV level, i can get a high voltage output, but the output voltage ripple is too large, reaching 3v as shown. Can the DRV2700EVM-HV500 output a stable, low ripple voltage?

Again,thanks for your support!