I have a power supply(DC) rated ~7.2A @ 34.5v. I am looking forward to drive an amplifier rated ~6A @ 34v(upper limit. actually 15 - 34VDC).
So my question is about the difference between supply and amp (0.5v excess). What are the chances that the difference(0.5v) is not tolerated and the amp is fried?
For me 0.5v difference is just ~1.5% higher then rated voltage, so assuming should be tolerable. But, since there is no datasheet available I could not confirm the same.
I could see similar question but for lower voltage like 4.5 vs 5 or 5 vs 6 or max was 12 vs 14.4 where the difference % of voltage is much higher then my scenario, so did not help much.
So, I would like your help to learn about your experience on similar scenario, you may have seen earlier. Or perhaps a theory for a possible outcome.
- Amp board: TDA7498 based chip (TDA7498 2*100w amp @ ebay)
- Power supply: Salvaged from a broken Philips Sub-woofer
- Power supply delivers exactly 34.5v under no load condition, I could not test it under load until now.
Options received until now:
- Use diode to drop some volts(will research on the spec)
- Do nothing, use as it is (last resort)
- I have seen similar chip being rated for higher voltages as well (15-36v), so assuming chip may tolerate the difference. Supports do nothing conclusion. Ref TDA7498E 2*160 amp @ ebay
- Added 2 6a diodes to drop around 1.2 volt (actual result -1.5v, net 33v)
- Attached 2" of heat sink to control heat (looks ok, not very hot under load)
- Added few caps(~3000uf) to stabilize voltage (was dropping to 15v under load)
Result is great, amp drives great. Thank you guys for the assistance.