Other Parts Discussed in Thread: LM5155
Hi!
I'm a part of a project where a TAS5825P is used to drive the woofers of a speaker and we are experiencing fairly high idle power usage (~0.6 W) for only this amplifier (half of total idle power). I was looking at the data sheet and I'm trying to find ways to reduce the idle power draw and noticed that the Quiescent current is reduced from 29.5 to 20.5 mA when increasing the inductance of the LC-filter (page 6, 10 uH to 22 uH).
a. Am I correct in thinking that Quiescent current is causing the idle power draw?
b. Does "No load" here refer to no audio input or no speaker connected?
c. Will increasing the inductance even more reduce idle power further?
d. Will increasing the inductance more have any adverse effects?
Note that the woofers are crossed over at 1.5 kHz, so the amplifiers do not need to output much over 3 kHz.
Is this a path worth exploring? Could we do something else to improve idle power draw?
Some more details:
- 4 Ohm woofers
- 3S1P li-ion battery pack
- Hybrid Modulation
- Hybrid-Pro enabled
- DC-DC booster set to 13-17 V (controlled by Hybrid-Pro)
- Analog gain in TAS5825P set to -4.5 dB
- Digital gain in TAS5825P set to 6 dB
- Maximum (peak) voltage out to woofers is about 14 V
- The unit is silent (no audible hiss from 50 cm distance)
/Anton