DRV2605: I am working with DRV2605, need help to reduce output to 1.5v. Current situation Input and output is 3V.

D.U

Part Number: DRV2605
Other Parts Discussed in Thread: TPS62510Dear, all. I had generated waveform using 3V power as follows: attach photo As you see, the high-edge of waveform is 3V. I need to change 3V waveform to 1.5V waveform. Best regards.

over 5 years ago

0 D.U over 5 years ago

Prodigy 130 points

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

TI__Guru* 84915 points

Hi, Ushijima-san,

The DRV2605 output voltage is configured with the RATED_VOLTAGE and OD_CLAMP registers.

http://www.ti.com/lit/ds/symlink/drv2605.pdf#page=42

I recommend to reduce these parameters in order to reduce the output voltage level too.

I hope this helps you. Please let me know if you have additional questions or comments.

Best regards,
Luis Fernando Rodríguez S.

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

Prodigy 130 points

Thank you for your reply. I had tried for various parameters by the PDF, but I didn't get 1.5V. So, I hope to send the sample code which generate 1.5V waveform. Can you also find out the way of voltage adjust by using step down converter in pcb hardware design? Best regards" Daisuke

0 D.U over 5 years ago in reply to D.U

Prodigy 130 points

And while we are testing, we confined that input and output voltage level is same, such as if 3v input, output becomes 3v. Please advice. Best Regards, Daisuke

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

TI__Guru* 84915 points

Hi, Ushijima-san,

Could you provide your DRV2605 schematic portion, please? This is to have a better approach to this issue.

In addition, are you configuring the device in closed-loop or open-loop? Which load are you using as DRV2605 output?

Thank you.

Best regards,
Luis Fernando Rodríguez S.

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

Prodigy 130 points

Deleted

0 D.U over 5 years ago in reply to D.U

Prodigy 130 points

We tried both open&close loop, but it didn’t work.

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

TI__Guru* 84915 points

Ushijima-san,

Unfortunately, we are not able to access to google drive due to internal politics. Could you share your schematic in this forum or via e2e chat, please?

Could you also share your registers configuration?

Do you have details about the load that you are using? Any datasheet?

Thank you.

Best regards,
Luis Fernando Rodríguez S.

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

Prodigy 130 points

Hello Fernando

I will get the information registered in drv2605. Please wait.

I would like to know whether if I can use step down converter IC TPS62510(http://www.ti.com/lit/ds/symlink/tps62510.pdf) after drv2605 output.

Please advice me.

Best Regards,

Daisuke

0 D.U over 5 years ago in reply to D.U

Prodigy 130 points

Deleted

0 D.U over 5 years ago in reply to D.U

Prodigy 130 points

DRV2604 and DRV2605 Configuration Tool and Design Equations - ERM.xlsx

I figured out the value based on your configuration tool... It's very hard to dump all of the registered value. Please understand.

Please let me know if you have any solution to setup 1.5V by drv2605 configuration value. And advice me if we can add step down convertor and how to make a schematic with it.

Best Regards,

Daisuke

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

TI__Guru* 84915 points

Hi, Daisuke,

Thank you for providing the schematic and attaching the configuration tool. Effectively, this tool is really useful to configure the DRV2605 with the values that you requested. Your schematic is correct, so using the proper values provided by the tool should be enough to get the overdrive and rated voltage that you are looking for.

Regarding you question about the step down converter, this device should be connected directly to the actuator. Its architecture has been designed to monitor the actuator characteristics. Using an external component between the DRV2605 output and the actuator may cause a bad signal performance.

Best regards,
Luis Fernando Rodríguez S.

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

Prodigy 130 points

Hi Fernando, So.., could you advice how to fix output voltage to 1.5v by setting the configuration values? Is there any values we need to try to change? If I can’t add step down converter after drv2605, I can’t find out the solution to fix. Please help, Thank you, Daisuke

0 D.U over 5 years ago in reply to D.U

Prodigy 130 points

Please also send me a sample file which is included all of the configure setting for testing? Thank you. Daisuke

0 D.U over 5 years ago in reply to D.U

Prodigy 130 points

Hello, could you reply as soon as possible? Because I haven’t received any solutions yet from you.

I am waiting for your reply.

Thank you,

Daisuke

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

Prodigy 130 points

Hello Luis, I found out similar topic posted in Ti support. e2e.ti.com/.../417442 I would like to keep full scale of PWM output 100% to 1.5v(input is 3v). So I need to confirm wether SI2301 or SI2302 PMOS is a good option or please advise something else. Please advice. Thank you,

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DRV2605: I am working with DRV2605, need help to reduce output to 1.5v. Current situation Input and output is 3V.