Bit of an odd thing to say, isn't the just stated performance of the fan controller an exact counter-example to that assertion?
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13 years ago
Overloading an LM317
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13 years ago
Pay for such smarts? We buy lots of fans, and I've stopped a lot of them by hand, and I've never seen one blow up. We don't even pay extra for non-blowing-up fans. Even the cheapest ones self-protect.
I remain surprised that nobody makes a good general-purpose current limiter chip. It wouldn't even have to be a single-purpose part, just one more current-set pin on an LDO.
John
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13 years ago
Those fans are quasi-stepper... kick, look for a commutation voltage, then continue, with some kind of minimum frequency start oscillator.
I've used the game at nearly 1/4hp levels (Bosch/Mercedes A/C fan motor). No current limit needed, though I've done that too. ...Jim Thompson
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| 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 |
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Spice is like a sports car...
Performance only as good as the person behind the wheel.
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13 years ago
Aren't the hot-swap controller chips pretty much that?
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
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13 years ago
Yep. Good observation. I should have remembered... I've designed them :-) ...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 |
Spice is like a sports car...
Performance only as good as the person behind the wheel.
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13 years ago
Some are, but there's very little above 5 volts. Fairchild (or is it ON?) has a specific current limiter part but it's, pretty well, limited. And expensive.
John