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From: oparr on 5 Apr 2010 20:23
No relatively expensive high side current monitor, comparator or latch
ICs either. You're wasting your time and money using these items if
all you need is a fast electronic "fuse". A single BJT, in conjunction
with the MOSFET, is all that is required for UVLO, overcurrent and
short circuit protection. Throw in a voltage reference, like the
TL431, if the switch has to cover a wide voltage range.
From: John Larkin on 6 Apr 2010 12:31
On Mon, 5 Apr 2010 17:23:01 -0700 (PDT), "oparr(a)hotmail.com"
<oparr(a)hotmail.com> wrote:

>No relatively expensive high side current monitor, comparator or latch
>ICs either. You're wasting your time and money using these items if
>all you need is a fast electronic "fuse". A single BJT, in conjunction
>with the MOSFET, is all that is required for UVLO, overcurrent and
>short circuit protection. Throw in a voltage reference, like the
>TL431, if the switch has to cover a wide voltage range.

I sort of doubt it.

John

From: Jim Thompson on 6 Apr 2010 12:47
On Mon, 5 Apr 2010 17:23:01 -0700 (PDT), "oparr(a)hotmail.com"
<oparr(a)hotmail.com> wrote:

>No relatively expensive high side current monitor, comparator or latch
>ICs either. You're wasting your time and money using these items if
>all you need is a fast electronic "fuse". A single BJT, in conjunction
>with the MOSFET, is all that is required for UVLO, overcurrent and
>short circuit protection. Throw in a voltage reference, like the
>TL431, if the switch has to cover a wide voltage range.

Post a schematic or show a link.

...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 |

The only thing bipartisan in this country is hypocrisy
From: oparr on 6 Apr 2010 14:05
>I sort of doubt it.

That's okay. Forgot to add inrush current limiting as another
attribute. BTW, by "single BJT", I'm referring to the only additional
active component. Passives such as resistors and caps are also
required.

On Apr 6, 12:31 pm, John Larkin
<jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote:
>
From: oparr on 6 Apr 2010 14:06
>Post a schematic or show a link.

Oh sure!

On Apr 6, 12:47 pm, Jim Thompson <To-Email-Use-The-Envelope-I...(a)On-My-
Web-Site.com> wrote:
>
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