Does it also document the reasons for the ECO and sign all the required spaces with those two keystrokes?
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- posted
12 years ago
-- You can't have a sense of humor, if you have no sense.
Why no depletion mode LDOs?
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- posted
12 years ago
An ECO is a company document that tells manufacturing to do something, like take exception to a drawing, or create a new dash number, or dab some epoxy on a lug, or something like that.
Here's one:
formatting link
That's different from a PADS ECO file, which is generated automatically by one of the PADS programs.
The first form of ECO vastly pre-dates the second one.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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- posted
12 years ago
And it has to be signed with this pen:
formatting link
[...]
-- Regards, Joerg http://www.analogconsultants.com/
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- posted
12 years ago
Did you investigate why this happened? I don't like that sort of "fix" unless the root cause is well understood.
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- posted
12 years ago
The root cause seems to be bad fuses.
Now *that* sounds like not-well-understood to me.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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- posted
12 years ago
And an arbitrary value like 1nF is? Come now...
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
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- posted
12 years ago
I've never had to write one (I guess I should I say that with some smugness??). The only direct use I have of ECOs is likely the same as PADS' ECOs. Either could be made into a report as such.
If you need to tack on a "reason" for those squishy readers made of meat, "it's broke" oughta be good enough.x
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
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- posted
12 years ago
My circuit was thought about and then simulated, and the values intelligently (by my standards) tweaked for stability and load transient response. The fets are operating deep in their ohmic regions, so the loop dynamics isn't as obvious as if there were more delta-v available.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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- posted
12 years ago
Our ECOs often have a longish section explaining the history and details of a product and why it has to be changed. It might say why one customer is doing something unusual and wants a special version. It might give manufacturing options as to whether to apply the ECO at all. We might include before-and-after waveforms. ECOs are an important part of our longterm institutional memory. Not just "do this", but why.
"It's broke" wouldn't get signed by me.
A PADS eco looks like...
*PADS-ECO-V3.0-MILS* *REMARK* old file: C:\padspwr\LogicFiles\ecogtmp0.asc *REMARK* new file: C:\padspwr\LogicFiles\ecogtmp1.asc *REMARK* created by ECOGEN (Version 6.0g) on 9/18/2011 10:59:47 AM *DELPIN* P1.14 GND P1.16 GND *NET* *SIGNAL* +1.5V P1.14 P1.16 *SIGNAL* GND P1.30 P1.32*REMARK* Deleted pins: 2, Added pins: 4
*END*which isn't all that useful, long-term.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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- posted
12 years ago
[snip] [snip]
Work/motion hardening of the fuse element... I see it all the time in automotive applications. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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- posted
12 years ago
- These boards are powered up essentially all the time, not cycled like car fuses.
- We tested a bunch of these fuses at pure DC, and some failed after a week or so.
- Still can't get your kill file to work right?
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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- posted
12 years ago
unless
Works well... observers are invited to drop by and see just how well.
I just decided I wasn't going to let some little San Fransicko prick exclude me from participating in technical discussions.
As to the automotive fuses... it's not cycling, it's vibration... makes the element look like a crystal... then they crumble. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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- posted
12 years ago
unless
We can see from here. Either you can't manage a simple kill file, or you're lying yet again. I'd bet on lying.
Technical discussions? Packing material? Tacky candles dripping on tacky decks? Redneck politics? Water softener dilemmas?
Pitiful.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
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- posted
12 years ago
unless
Drop by and see who it is that is lying.
Yep. Pitiful how you can't help but be rude. Must be terrible to feel so insecure that you have to resort to such tactics. But I guess that's all a weenie can fall back on. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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- posted
12 years ago
Otherwise it's unstable. So much for "designing LDO's". ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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- posted
12 years ago
It's not unstable. The dump resistors greatly improve load-step response.
-- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
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- posted
12 years ago
unless
I've seen pics of your house and its surroundings. No thanks.
Me? Rude? You deliberately, grossly, and repeatedly insulted my wife. I said that those acts make you an asshole forever, and they do.
Put me back in your kill file and keep out of my threads, like you've sworn to do so many times.
-- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
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- posted
12 years ago
Actually, there is one theory: the fuse blow current depends on heat sinking, which depends on pad geometry and board stackup. The rating may assume a different PCB situation than ours.
We strung together a bunch of these fuses, in series connected by small wires, and ran them at 200 mA, and one failed after a few days. That partially confirms the heat sinking theory. But rather than investigate more, we just fixed it with the half-amp polyfuses. We could have put in zero-ohm jumpers, actually.
We've found that the trip current of a surface-mount polyfuse is also very dependant on PCB layout. The thru-hole radials are much more repeatable.
-- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
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- posted
12 years ago
I don't know about "commercial", but there are certainly such circuits in custom ASIC's...
Like RFID tags I designed for Intermec (an IBM spin-off that I'm sure Hobb's knows of)... used a depletion device (Fairchild ASIC process) as a very low power way to start-up bandgaps... turned off as soon as bandgap bias became self-sustaining. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
- Vote on answer
- posted
12 years ago
[snip]
"Your" threads? What a weenie. ...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.