TX-SDK-V2 setback while configuring

Hi Vidya,

1) How are the +/-40V (VPF & VNF) supplies generated? From page 10 of the LM96550 datasheet, it mentions that VPF ≥ VPP −14V and VNF = ≤ VNN +14V at ALL TIMES. Attach is a slide of a typical power supply setup.

7762.TX_SDK_V2 LM96550 Lab Bench Power Supply Setup.ppt

2) It's possible that all 3 parts (LM96550, LM96570, LM96530) might be damaged. You can order the part(s) thru digikey.

3) Yes, you can replace the LM96550 with the LM96551. If you do, just don't connect the +/-40V to the TX_SDK board.

4) We are trying to put power module schematic on the web. When we do, we'll post on E2E community or email you (if you provide us your email address).

Regards,

Charles

Hi Charles,

Thank you!

1. We are using 6 power supplies to generate +/-50V and +/-40V. Attached file illustrates our connection schema. 2728.TX_SDK_V2_Supply configuration.pdf
2. Is there a way I could test the Beamformer (LM96570) and T/R Switch (LM96530) onboard the TX-SDK-V2 by using supplies required for their operation only? This is to run a quick check on which parts have been damaged.
3. It would be great if TI could post some power supply designs for this EVM. It would be greatly appreciated! I would like to be apprised through: vidya_v89@yahoo.co.in, vvasude2@hawk.iit.edu
4. In the case of procuring the parts off-the-shelf, we do not have the expertise to solder the parts onto this EVM board. Is there a way TI could support us in replacing the components?

Appreciate your support!

Regards,

Vidya

Hi Vidya,

1) From your power supply configuration, you WON"T meet the following requirement once you turn on +50V but before you turn on +40V (VPF=0 and VPP=50V). You need to configure the +/-40V from the +/-50V as shown in my previous post.

VPF ≥ VPP −14V and VNF = ≤ VNN +14V at ALL TIMES

2) You can de-soldered the LM96550 and check  all the power supplies to see if any is shorted to ground.

3) I'll let you know once the  power module schematic is up on the web.

4) I am sorry I don't think we support soldering and de-soldering components.

Regards,

Charles

Charles,

In response to your post:

1) The +/-40V and 50V supply connected were varied in steps of 5V so as to maintain a max difference of 10V between VPF and VPP; VNF and VNP. All the while maintaining VSUB as the most negative ( = VNP).
Considering this, i don't believe there should be any issue with the power supply as we were able to configure the board.

Now, the +/-10V supply goes into CC mode as soon as it is turned ON. This is before the +/-40V and +/-50V supplies are turned ON.

2) Even with the Pulser IC on-board, there are no obvious shorts between the supplies and ground.

3) Thank you for the power supply module! I received your e-mail.

Appreciate your support.

Regards,
Vidya

Hello Charles,

I'm attaching Beamformer output waveform images. They appear to be correct. However, we are still having issues with the pulser.

Vidya

Hi Vidya,

Yes, the beamformer output is corrected. As for the pulser, are all the supply voltages at the right levels? Did you click on the 'Enable High Voltage Pulser' botton?

Regards,

Charles

Hello Charles,

The Supply voltages (for LM96551) are:

VDD/VDN = +/-10V

VPP/VNN = +/-15V

VSUB = -20V

The settings for pulser - 'Enable High Voltage Pulser' was enabled.

With the view of events/troubleshooting since the time we got this board (Dec'13), would it not be better to get another tx-sdk-v2 board as a replacement for the one we have? 

Vidya

Hi Vidya,

If you like you can order it from the following website:

http://www.ti.com/tool/TX-SDK-V1

However, I don't believe you can just order the TX_SDK_V1(you probably want the EVM with the LM96551). You have to buy the whole kit (TX_SDK_V1, XEM3001, adapter board...)

Regards,

Charles

Charles,

It would be great if I could get the existing board (tx-sdk-v2) exchanged. I can ship out the whole kit, if required, or only the Pulser/Receiver Board.

We've been continually facing issues since the time we bought it and our work has taken a huge hit in meeting the required timelines.

Appreciate your support.

Vidya

Hi Vidya,

Your request for exchanging the board have been communicate to the proper channel.

Regards,

Charles

Hello Vidya,

Currently we do not have any boards available on-hand to do an exchange. Replacement boards would therefore need to be purchased.

We think that the Pulser chip has been damaged on the board. If you can get that part from Digikey (or equivalent), there is a good possibility that replacing it would solve your issue.

Regards,

Hooman

Hello Hooman,

We did try replacing the Pulser (LM96550) with LM96551 and even then we couldn't get it to work as expected. The other parts of the board seem to be working fine.

Since, we're only looking at getting a replacement for the pulsar board. Would it be possible for us to get it at a discounted price?

We're also looking at purchasing quite a few other EVMs from TI in the near future.

Thank you.

Regards,

Vidya

Hi Vidya and Hooman,

As mention in my earlier post on 1/20, you can replace the LM96550 with the LM96551 on the TX-SDK-V2 board as long as you don't connect the +/-40V supplies. The reason you can do it is because the +/-40V supplies are built into the LM96551.

However, you can't replace the LM96551 with the LM96550 on the TX-SDK-V1 board since there is no external supplies connection for the +/-40V supplies.

Regards,

Charles