TDC1011: Driving 1kW Transducer

Michael Liesenberg85

Mastermind 7560 points

Part Number: TDC1011
Other Parts Discussed in Thread: UCC27531, , PGA460, TDC7200, TLV61046A

Hi,

i am using the TDC1011 with the UCC27531 to drive my transducer.( TDC1000-GASEVM)

I have a step up converter that generates 28V.

Everything works fine but i dont know if the Burst i am sending is enought to drive a 1kW transducer.

Do i need a transformer to boost my 28v to like 280V maybe?

How does a transducer power is measured P = u*i (1000W = 1000V * 1A) ?

OBs: The PGA460 has only 11m of object detection. I need at least 100 meters

over 5 years ago

0 Scott Cummins over 5 years ago

TI__Mastermind 31655 points

Hi Michael,

Is this for air measurement? In general the PGA460 is the better device for air proximity sensing because of it's better adaptability to transformer driven transducer systems, as well as several other features like time varying gain and time varying thresholds.

The PGA460 can technically measure an arbitrary distance by running a single transmit and listen period followed by as many echo listen periods as needed, however, 100 meters is an extremely difficult distance for ultrasonic sensing. I've notified my colleague who can give you more information about the PGA460, but I don't think that ultrasonic is the right sensing mechanism for this application. I would look into LIDAR for distances this large.

TI doesn't have a dedicated LIDAR AFE, but the TDC7200/7201 can be used as the timing device for such a system. There is a TI design that demonstrates this application: www.ti.com/.../TIDA-00663

Regards,

0 Michael Liesenberg85 over 5 years ago in reply to Scott Cummins

Mastermind 7560 points

Hi Scott,

its a 1kW Sonar for water depths sensing .
TDC1011 is perfect and i dont need TDC7200 for timing, the MCU interrupt precision timer is enought.
What i need is a way to boost TDC1011 TX Burst up to 200V i think. How can i drive a 1kW Transducer at 80kHz Burst?
What does 1kW Transducer means? Its the power that it can output? How do i transform output power in voltage/current?

0 Akeem Whitehead over 5 years ago in reply to Michael Liesenberg85

TI__Mastermind 27780 points

Hi Michael,

Please refer to the following post for details on using the PGA460 to drive a submersible transducer at 1kV:
e2e.ti.com/.../2561532

The part number in discussion is the Prowave 200LM450. I have just received samples of this transducer, and will be testing its compatibility/performance with the PGA460 this month. I will be using the PGA460's standard push-pull transformer (1:1:10 turns ratio) driver configuration for the initial testing (no DRVxxxx parts). This will enable upwards of 200Vpp to excite the transducer.

0 Michael Liesenberg85 over 5 years ago in reply to Akeem Whitehead

Mastermind 7560 points

Hi Akeem,

the only downside of PGA460 is the 11 meter object detection. Is there a boost converter and MOSFET from TI that can replace the internal components of PGA460? The TDC1011 is perfect for burst TX and RX controll but i only need the part now to drive the transducer.
If you have any good results with 200LM450 transducer please share with us.

Kind regards,

Michael

0 Michael Liesenberg85 over 5 years ago

Mastermind 7560 points

Part Number: TDC1011

Hi,

i want to use the TDC1011 to measure water depths and not the PGA460 because of its 11m distance limit.

Is there a circuit/IC from TI that can drive 1kW transducer from a LiOn battery?

The DR8870 IC can supply 3.6A output current with 45V as input power. This makes an ouput power at 157.5W right?

So far i have a custom board with TDC1011 sending burst to UCC27531 and it drivers the transducer with a 28V from a step up converter TLV61046A.

Since the TLV61046A has a current limit of 980mA and UCC27531 output the burst with 28V amplitude, the output power on the transducer can be maximum 27,44W right?

So i have to increase 35 times more the output power to get 1kW, but how can i do this?

0 Akeem Whitehead over 5 years ago

TI__Mastermind 27780 points

Hi Michael,

I recommend that you post your question about generating the 1kW output on the TI Power Management E2E forum at:
e2e.ti.com/.../

They can provide better feedback to help with your high power driver solution. This 1kW ultrasonic transducer is a special case that we have not had much experience with since most transducers we pair with require less than 10W.

I'm still working on the 200LM450 testing to determine if less driver power will yield useful results with the PGA460's typical transformer driver. Have you had a chance to test the 200LM450 using your 27.44W driver? If so, what minimum and maximum range are you able to detect thus far?

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TDC1011: Driving 1kW Transducer