Any insight for Automotive Sensor Inputs/ Front-End Protection.
in [Design]
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From: Johnny5 on 26 Apr 2010 18:35 I was curious if anyone had any insight into protecting an Opto- isolator LED input from load dump, Jumpstarts, and many of the other signals in the auto environment. FETS,CLIPPERS,Clamps? Thank you in advance, It is an open drain SSR.
From: Jamie on 27 Apr 2010 06:52 Johnny5 wrote: > I was curious if anyone had any insight into protecting an Opto- > isolator LED input from load dump, Jumpstarts, and many of the other > signals in the auto environment. FETS,CLIPPERS,Clamps? > Thank you in advance, > It is an open drain SSR. TVS diodes. Transorbs is another name for them. The 1.5k series seems to work nicely..
From: Joerg on 26 Apr 2010 19:18 Jamie wrote: > Johnny5 wrote: >> I was curious if anyone had any insight into protecting an Opto- >> isolator LED input from load dump, Jumpstarts, and many of the other >> signals in the auto environment. FETS,CLIPPERS,Clamps? >> Thank you in advance, >> It is an open drain SSR. > TVS diodes. Transorbs is another name for them. > Also Transzorb. And ST calls them Transil. It's trade names, like Kleenex or Kim Wipes. [...] -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 26 Apr 2010 19:35 On Mon, 26 Apr 2010 16:18:05 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Jamie wrote: >> Johnny5 wrote: >>> I was curious if anyone had any insight into protecting an Opto- >>> isolator LED input from load dump, Jumpstarts, and many of the other >>> signals in the auto environment. FETS,CLIPPERS,Clamps? >>> Thank you in advance, >>> It is an open drain SSR. >> TVS diodes. Transorbs is another name for them. >> > >Also Transzorb. And ST calls them Transil. It's trade names, like >Kleenex or Kim Wipes. > >[...] No canned answers. It depends on the circuitry. ...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: Joerg on 26 Apr 2010 19:57
Jim Thompson wrote: > On Mon, 26 Apr 2010 16:18:05 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> Jamie wrote: >>> Johnny5 wrote: >>>> I was curious if anyone had any insight into protecting an Opto- >>>> isolator LED input from load dump, Jumpstarts, and many of the other >>>> signals in the auto environment. FETS,CLIPPERS,Clamps? >>>> Thank you in advance, >>>> It is an open drain SSR. >>> TVS diodes. Transorbs is another name for them. >>> >> Also Transzorb. And ST calls them Transil. It's trade names, like >> Kleenex or Kim Wipes. >> >> [...] > > No canned answers. It depends on the circuitry. > Sure it does. But it ain't rocket science. There must be a resistor, then a TVS to GND, then another resistor, then LED to GND. The latter resistor is sometimes part of the SSR already. Hey, anyone else have issues with a Digikey order today? I was on the phone with their IT for over an hour, they were becoming frustrated as well, still no answer what's wrong. Had to order at Mouser now. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |