Hi all, I need a LDO (100mA/5V) with a UVLO ULVO>4V min. i.e. the LDO output starts (no regulation) at 4V and beyond and start regulation at (5V + Vdropout) > 5.25V It's possible to do this with a TL431 placed before the LDO to enable certain EN pin in certain LDO but it's too complicated ....
Best regards, H.
Sounds like a dual opamp could do that
NT
Although i'm not for using a dual op amp could you elaborate this ?
Not totally clear what you want. Can you elaborate? ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| 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.
Hey Jim, it's probably my english syntax ... so i can be more explicit, sure. Is an LDO chip exists on the market that fulfill my requirements ?
BR, H.
I can read French highway signs... Otherwise I'd be lost forever south of Strasbourg ;-)
You want an LDO with a UVLO at 4V... is that correct?
For the LDO, itself, what specifications, Vout, Imax, etc? ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| 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.
Hey you've been near Strasbourg en Alsace ! Hope you've enjoy the food and some local beers (pils). You mention south of Stras where exactly ? in fact i know Alsace-Lorraine very well 'cause i've been living there some years ago (In Mulhouse exactly).
Yes exactly.
Vout = 5V, Imax=0.1A, No other specific requirements like line regulation, noise reject ratio ...etc
BR, H.
One opamp clips output at 5v. 2nd opamp removes output tr drive if V_out is nt going to meet 4v.
NT
+ e
isnt going to meet 4v.
Opamps are the obvious option, but one could probably use diods/zeners & tr s instead
NT
-Lasse
This is exactly the LDO which i need ! pp 18 & 19 of the datasheet describe just fine my system requirements, futhermore i quiecent is quite low.
Thank you very much Lasse.
BR, H.
TL431 is a 3 terminal device containing a comparator and a voltage reference. It's probably better than op-amps,
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te:
tput
5V +fore
ut isnt going to meet 4v.
& trs insteadA comparator wouldnt work, an opamp does. I presume TL431 contains an opamp - it won't be a comparator.
NT
Not "comparator", but "amplifier".
As I have posted before, you can actually use a TL431 as an OpAmp. ...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| 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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