psu for lme49810

[back]

it`s going to work as input stage at +-80volt.

should i use regulated psu or not?

any recomendations?

hard to find regulated psu at that voltage.

 

[AndrewT]

Salas Shunt or 317

 

[TonyTecson]

get yourself a 500va torroid, bridge rectifier like the mda3504, 2 x 47,000/100volt caps and you can build yourself a power supply...http://www.pansonaudio.com/Docs/Using LME49810 Power OpAmp - Part One rev1p0.pdf
http://www.pansonaudio.com/Docs/Using LME49810 Power OpAmp - Part Two rev1p0.pdf
http://www.ti.com/lit/ds/snas391b/snas391b.pdf

 

[back]

Salas Shunt or 317

i already have both but how can i make them work at 80volt?

 

[back]

get yourself a 500va torroid, bridge rectifier like the mda3504, 2 x 47,000/100volt caps and you can build yourself a power supply...http://www.pansonaudio.com/Docs/Using LME49810 Power OpAmp - Part One rev1p0.pdf
http://www.pansonaudio.com/Docs/Using LME49810 Power OpAmp - Part Two rev1p0.pdf
http://www.ti.com/lit/ds/snas391b/snas391b.pdf

i already have psu for the output stage, i only need separate for the lme chip

80volt 100ma.

 

[TonyTecson]

i already have psu for the output stage, i only need separate for the lme chip

80volt 100ma.

read up on the links i posted, i do not think regulators are needed here, the chip itself has high PSRR negating the need for such regulators...

or maybe you wanted to lose some voltage?

 

[back]

there is no need to loose voltage.

actually i think the lme needs a bit higher.

my psu is +-75volt after rectification so 80 would be fine.

i will read the links thanks.

p.s.i intend to regulate the chip only.

 

[rikkitikkitavi]

wont you need a current limited supply, in case you short output stage?

If you have an ordinary (V)I limiter over the emitter resistors, then this will pull a lot of current through the driver stage, ie LME498XX and almost short this out.

If you have a current limited supply, then eventually the LME overtemp protection will cut in because of the high V*I drop.

 

[TonyTecson]

guys, you really need to study the datasheets carefully and learn about the chip's many features....

 

[rikkitikkitavi]

okay; can you point out where it the datasheet it says something about max outputcurrent and short circuit proof? i can not find this . I am fullly aware that you can use mute for shut down the gain stage and thus remove output signal.

 

[TonyTecson]

okay; can you point out where it the datasheet it says something about max outputcurrent and short circuit proof? i can not find this . I am fullly aware that you can use mute for shut down the gain stage and thus remove output signal.

the topic here is about psu for the chip, if you want to discuss about the chip itself, i can refer you to these fine threads....

http://www.diyaudio.com/forums/chip...ity-highpower-amplifier-reference-design.html

http://www.diyaudio.com/forums/solid-state/204633-lme49810-question.html

http://www.diyaudio.com/forums/chip-amps/168998-build-thread-lme49810-8-pairs-thermaltrack.html

http://www.diyaudio.com/forums/chip-amps/195692-lme49810-using-triple-cfp-output-stage.html

http://www.diyaudio.com/forums/chip-amps/161337-yet-another-lme49811-std03-build.html

http://www.diyaudio.com/forums/chip-amps/153511-compact-sized-lme49810-11-thermaltrak-amp.html

http://www.diyaudio.com/forums/chip-amps/143163-comparing-lme49810-49830-49811-a.html

http://www.diyaudio.com/forums/soli...class-amplifier-50watts-into-4-ohms-more.html

http://www.diyaudio.com/forums/chip-amps/199132-my-hi-end-current-lme498xx-amplifier.html

http://www.diyaudio.com/forums/chip-amps/222285-lme49810-1200rms-into-8-ohms-amp-possibility.html

 

[rikkitikkitavi]

Thanks for your effort, Tony. Me thinks PSU and chip are interleaved and thus deserve a disussion despite this thread have a different direction.
Especially since I have not found any info regarding.my question neither.reply from NS (TI)
I will reread the threads again.though as one might easily miss out on important information.

 

[TonyTecson]

they are, the chip output current is limited to 60mA as far as i know, since you will be connecting external transistors, soa protection will be responsibility of the designer....and there are many threads here about that...

 

[back]

i have test it with regulated smps and it sounds awesome.

chip and output stage tied up together.