Hello everyone!
I am working on an integrated amplifier that will run on a 25.6 LiFePo battery pack. I'm using John Broskie's Aikido LV for the preamp, the TI-600 Class D module from ClassDAudio.com for the power amp. Both the amp and preamp can run on 24VDC, which is approximately the voltage I expect to see from the pack under load through most of its discharge curve.
Now don't laugh, but I am considering implementing a tone control. I've found a 3-band tone control module that requires 15VDC and I need to find a way to power it from the main LiFePo pack. Is it ok to use something like these TI DC/DC converters in a preamp circuit? This unit seems like it would do the job perfectly and with a claimed >85% efficiency.
Here is the link to the particular device on Mouser. I sure appreciate any input or comments you might have.
78SR115HC Texas Instruments | Mouser
I am working on an integrated amplifier that will run on a 25.6 LiFePo battery pack. I'm using John Broskie's Aikido LV for the preamp, the TI-600 Class D module from ClassDAudio.com for the power amp. Both the amp and preamp can run on 24VDC, which is approximately the voltage I expect to see from the pack under load through most of its discharge curve.
Now don't laugh, but I am considering implementing a tone control. I've found a 3-band tone control module that requires 15VDC and I need to find a way to power it from the main LiFePo pack. Is it ok to use something like these TI DC/DC converters in a preamp circuit? This unit seems like it would do the job perfectly and with a claimed >85% efficiency.
Here is the link to the particular device on Mouser. I sure appreciate any input or comments you might have.
78SR115HC Texas Instruments | Mouser
My initial response would be: NO, for godness sake NO.
BUT, if the converter operates in a region of 100khz or higher, the residual noise is quite simple to get rid off.
Remember that the efficiency is UP TO 85%, often much less. But still better than a linear regulator.
Also there is an issue that Your battery pack should have some volts "to go on" to obtain fully regulation on the regulator.
Note the marking: NRN, Not recommended for new designs.
Buy a surplus, so You have spare for later use.
BUT, if the converter operates in a region of 100khz or higher, the residual noise is quite simple to get rid off.
Remember that the efficiency is UP TO 85%, often much less. But still better than a linear regulator.
Also there is an issue that Your battery pack should have some volts "to go on" to obtain fully regulation on the regulator.
Note the marking: NRN, Not recommended for new designs.
Buy a surplus, so You have spare for later use.
http://www.cui.com/Product/Resource/DigiKeyPDF/V78XX-500.pdf
V7815-500
280KHz to 450KHz
beyond my hearing range
🙂
V7815-500
280KHz to 450KHz
beyond my hearing range
🙂
Thanks guys for the replies. I notice that the TI part I referenced above is between 600 and 700khz. So maybe it will work out? Got one on the way from Mouser today.
@DUG: Have you used the CUI regulator before?
@DUG: Have you used the CUI regulator before?
I use a V7805-1000 at work regularly when power dissipation is too much for a standard LM7805T (fed from 24V) but it is not audio work.
I have used an NMA2415SC for audio work where the signals get fed to an analyzing system...filtered well with CLC or CRC. (isolated output helps break ground loops)
I have also used a LM7805T to NMA0515SC for automotive audio buffers...seems to be OK. (12 down to 5 then up to +/-15 isolated)
Like I said...beyond my hearing range
🙂
I have used an NMA2415SC for audio work where the signals get fed to an analyzing system...filtered well with CLC or CRC. (isolated output helps break ground loops)
I have also used a LM7805T to NMA0515SC for automotive audio buffers...seems to be OK. (12 down to 5 then up to +/-15 isolated)
Like I said...beyond my hearing range
🙂
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