TDA7294 High-efficiency Version, +/- 20-volt supply

mramalfi · ‎2014-07-02

Posted on July 03, 2014 at 00:14

Hello,

I had a question of the best way to implement the supplemental +/- 20 VDC *supplemental* supply (i.e., not the +/- 40 VDC main supply). My 40 VDC supply is unregulated. Two thoughts were to use a voltage divider (off of the +/- 40 VDC supply), or even a high-current regulator on the +/- 40 VDC supply. If a voltage divider is acceptable, what is the best way to minimize the static/idling current when the additional power isn't required ?

Thank you,

Mr. Amalfi

#audio-amplifier-tda7294

Nickname1623_O · ‎2014-07-02

Posted on July 03, 2014 at 04:51

hi Whitney ,

it's beter to use divider before rectification circuit , for example , add more output from your power transformer ( provided AC for +/-40V DC supply ).

if you wanted to achieve higher system efficiency , it's better to use resonance SMPS to replace tranditional transformer , for more detail about it , please check below link:

http://www.st.com/web/catalog/sense_power/FM142/CL1454/SC354/PF224133?s_searchtype=partnumber

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Thanks