Hi,
I am looking for an audio amplifier capable powering a variety of voice coil motors. The main requirements are to be able to:
Drive two 4 ohm impedances simultaneously, with a power of up to 50 [W] per voice coil.
Drive a single 8.5 ohm impedance, at up to approx 20 [W].
Drive a single 2 ohm impedance, at 5-15 [W].
Ideally, the amplifier will be available as an EVM to reduce design and manufacturing time for the small quantities we need.
Right now I am driving all of these impedances from a TPA3123D2, in an EVM. However, the 2 ohm impedance is actually below the 3.2 ohm absolute minimum impedance.
Is there some way I can drive all of these loads (not at the same time) with a single amplifier? It seems like it would be easy to do with the TPA3118D2, but would require some switching to switch between a single PBTL of 2 ohms and two outputs of 4-8. However, it would be nice to not have to use switches.
At low power (<15W, likely <10W), is driving the 2 ohms with the TPA3123D2 going to destroy the amp? What would be a better solution?
Thanks,
Tom.