Electronics > Projects, Designs, and Technical Stuff
The TLV760xx regulators are a nice piece [s]of crap[/s]
Warhawk:
Look, I don't know what you're exactly doing but I recommend posting this on the E2E forum which is available online and is free of charge. Somebody will start dealing with your issue typically in less than 24 hours. It would be great if you could post pictures of your setup and eventually a circuit diagram. This often helps. (huh, how many times we've seen customers complaining that TI produces shit and then we saw a 2 MHz switcher without a PCB, put together with just a bunch of jumpwires...).
It may be a quality issue but I've been using e.g. TPS70933 for some time (last time today!) and have not had a problem yet.
PS: Not only TI has a lot of bullshit floating around. It is simply difficult to get qualified staff and customers want LDOs for 1 cent.
Best Regards,
Jiri, TI
bloguetronica:
--- Quote from: Warhawk on February 10, 2019, 04:25:30 pm ---Look, I don't know what you're exactly doing but I recommend posting this on the E2E forum which is available online and is free of charge. Somebody will start dealing with your issue typically in less than 24 hours. It would be great if you could post pictures of your setup and eventually a circuit diagram. This often helps. (huh, how many times we've seen customers complaining that TI produces shit and then we saw a 2 MHz switcher without a PCB, put together with just a bunch of jumpwires...).
It may be a quality issue but I've been using e.g. TPS70933 for some time (last time today!) and have not had a problem yet.
PS: Not only TI has a lot of bullshit floating around. It is simply difficult to get qualified staff and customers want LDOs for 1 cent.
Best Regards,
Jiri, TI
--- End quote ---
Well, I don't want LDOs for 1 cent, but I want LDOs that won't damage parts. Yes, the TPS70933, the TLV76033 and the TLV76050 were all tested on a PCB. The circuit is available on the 18th post of this thread.
By the way, I've used the TPS70933 before. Never had a problem while connecting it to 5V. In your case, did you used 24V?
P.S.: Schematic available here too. I'll change the regulator back to the TLV76050, unless I see and advantage using the TPS70950. For sure, I'll have to use a resistor in series with the regulator.
Kind regards, Samuel Lourenço
schmitt trigger:
I would send some failed devices for decapping and have a good SEM image taken from the die.
Even though it will be identified as an “external EOS event”, the relative location of the event within the die can provide additional information about the nature of the failure. Specially if the EOS are always located in the same area.
Warhawk:
I use TLV70933 in the application up to 18 V. I needed something with ultra-low standby current. I saw your schematic after I submitted my post and didn't see there anything wrong. What kind of power supply do you use?
How long are the wires from the PS to your board? How do you enable the system? (turning on the PS, pressing the output on/off button or just connecting the banana plug?). Do you have any other testequipment (e.g. oscilloscope or a laptop) connected to your board? If so, is your output of the PS connected to the chassis, aren't there any grounding loops?
First, I would take measurements on the regulator (Vin-GND, Vout-GND). You have the right scope for it. Just use single shot.
Anyway, I really recommend you posting this on the E2E forum.
PS: I understand that you're upset and probably frustrated (I am the same blood type) but take measurements first. For example, we have a linear PS from a reputable company in the lab which does spikes up to 60V after turn-on. We probably ship millions of these so I would be really surprised if they were systematically failing at 24-V.
Regards, Jiri
bloguetronica:
Well, I'm just plugging and unplugging to an already on power supply. That should pose no issue. I'll try to get some scope shots soon.
Kind regards, Samuel Lourenço
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