DRV2667: DRV2667

Rajan Bedi

Expert 1565 points

Part Number: DRV2667

How is it that the DRV2667 when powered from 3V3 or 5V can output > 100V to drive an actuator?

How is this amplification beyond the supply rail possible?

Also, what would be the impact if the DRV2667 was driven by a single-ended analogue input?

Thank you

over 3 years ago

0 Arthur Brown over 3 years ago

TI__Mastermind 20685 points

Hi Rajan,

the DRV2667 can be driven single ended. the analogue inputs are differential, in the differential configuration any common-mode noise would be canceled, in the single ended configuration the noise would not be cancelled. this is the only negative of using single ended input..

the DRV2667 can drive voltages higher than the supply voltage because it has an integrated DC to DC boost converter. this article well explains the function of a boost converter https://learnabout-electronics.org/PSU/psu32.php

the DRV2667 has a very good boost converter, 3.3 -> 105V. as one of our old systems engineer says. "the boost converter in that part is a work of art!"

Regards,

Arthur

0 Rajan Bedi over 3 years ago in reply to Arthur Brown

Expert 1565 points

Arthur,

Can I drive the DRV2667 using a DAC to precisely control its high-voltage output?

0 Arthur Brown over 3 years ago in reply to Rajan Bedi

TI__Mastermind 20685 points

Hi Rajan,

Yes, the input can be directly connected to a DAC output and control the high voltage output like a (low current) DC source

Regards,

Arthur

0 Rajan Bedi over 3 years ago in reply to Arthur Brown

Expert 1565 points

Arthur,

What's the power consumption of the DRV2667?

Kind Regards,

Rajan.

0 Rajan Bedi over 3 years ago in reply to Rajan Bedi

Expert 1565 points

Arthur,

Can I use the DRV2667 to drive (140V) a piezo that has a capacitance of 15 uF?

0 Brian Donoghue over 3 years ago in reply to Rajan Bedi

TI__Intellectual 2620 points

Rajan,

Sorry for the delay, Arthur has been travelling for business and is expected back in the office tomorrow.

Brian

0 Arthur Brown over 3 years ago in reply to Rajan Bedi

TI__Mastermind 20685 points

Hi Rajan,

Basic power consumption figures can be found in the datasheet.

the boost voltage is limited to 105V, so no you cannot drive a precise DC output up to 140V, however in differential AC configuration you can drive 140Vpp from the output.

Regards,

Arthur

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DRV2667: DRV2667