I've had a small batch of PCBs made for a prototype design, and realise I may have overlooked power requirements for the TPA2005D1; With a VDD of 3.3V, if I was to drive it at max load and gain, how much current would it require (ballpark)? eg., is it simply 1.4W Max as in 3.3V x 424mA, or is it a bit more complicated than that?
It's set up for single-ended input as per Fig33, with CI of 1uF and RI of 150k, feeding directly off an MCU's PWM output (3.3V)
I designed the board to run off a TLV70033, as I thought I'd added up all requirements to be well less than 200mA. If I do need more current, is there any direct replacement for the TLV70033 SOT (DDC)?
I think Figures 5 and 6 of the data sheet answer your question.
As for the direct replacement for TLV70033, I'm not sure; you'll need to check the power side of the house. I am not sure what the maximum current we offer in an SOT is, I am a little worried that the SOT can't dissipate enough power to get more than 200 mA out... But, I'm not that familiar with our LDO offerings (we are a little bit silo'd...).
Audio Applications Engineering Manager
Dallas, TX USA
Thanks Don, missed those graphs. I'm not actually sure of the impedance of the speakers I plan on using (surplus mobile phone speakers, specs are impossible to find), but either way it looks likely to be pushing the limits of the 70033. I've got some 1Amp TPS73733's handy which appear to have a similar connection scheme, but different package; will try shoe-horning in a sub-board for these prototypes and redesign for the next batch.
Let us know if you run into any other problems.
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