I got a Meanwell SE-600-48 PSU for this EVB. I didn't realize the fan runs all the time. I unplugged the fan and ran it hard for two hours, the internal heatsink reached about 45°C.
I bought some thermal switches and put one inline with the fan. I then tucked it in next to the stock over temp cut off switch. This particular switch isn't isolated from the case, it comes with a silicone tube that goes over it, otherwise I would have slid it into the same channel the existing switch is in. On other Meanwell supplies, the fan kicks in at 50°C and off at 40°C, so 45 seemed right, no clue what the hysteresis might be.
Now the fan doesn't run unless you're listening very loud, in which case the fan can't be heard. 😀
I bought some thermal switches and put one inline with the fan. I then tucked it in next to the stock over temp cut off switch. This particular switch isn't isolated from the case, it comes with a silicone tube that goes over it, otherwise I would have slid it into the same channel the existing switch is in. On other Meanwell supplies, the fan kicks in at 50°C and off at 40°C, so 45 seemed right, no clue what the hysteresis might be.
Now the fan doesn't run unless you're listening very loud, in which case the fan can't be heard. 😀
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Hi N Brock.
That’s just what
I need for my PSU’s
That’s probably an advantage of getting the 600w PSU. Most of the time it’s just loafing, and it probably has a bigger heatsink too.
I suspect the fan will never turn on, but it gives lots of peace of mind having that switch just in case!
That’s just what
I need for my PSU’s
That’s probably an advantage of getting the 600w PSU. Most of the time it’s just loafing, and it probably has a bigger heatsink too.
I suspect the fan will never turn on, but it gives lots of peace of mind having that switch just in case!
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From the tpa3250 datasheet's output power vs THD graph, it seems this chip in BTL mode, provides least noise for output of around 7w to 40w for 8 ohm load.
Now how do we run the EVM board in BTL mode, to output in the range of " 7w - 40w " per channel of stereo ? Do we need to limit the supply voltage from 15v to 24v? or is there any other way for maintaining low noise output power?
I also got a MW 600 series to try out. It is frickin' LOUD. I bought a Noctua 60mm fan off amazon to swap in but haven't done it yet. Perfectly happy with my Connexelectronic PSU. Yes, the Connex cost more than the MeanWell but they are so convenient and compact and well made, that it's worth every penny.
Meanwell SE-600-12 Fan Control - Page 1
This guy has done a nice job by connecting Zalman Fanmate 2 controller in the fan so he can reduce the speed. The issue he says is that the voltage from the fan header is 14.7V but the fan is only rated at 12v, thats why the fan runs loud.
This guy has done a nice job by connecting Zalman Fanmate 2 controller in the fan so he can reduce the speed. The issue he says is that the voltage from the fan header is 14.7V but the fan is only rated at 12v, thats why the fan runs loud.
I think the " 7w - 40w " sweet spot you see is the result of using the highest recommended power supply voltage. If you used a 24 volt power supply, the maximum power would be 36 watts into an 8 ohm load. Remember, 1/2 the voltage equals 1/4 power. Your sweet spot would probably be 2w - 10w(?).
Now, if your listening level is low and/or your speakers are very sensitive, this may be fine.
I saw that vid. Even with resistors dropping voltage it is still loud. It's just a crappy fan. I swapped in the noctua and it is close to silent. Well worth the $15, just a few dollars more than the fan controller.
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The Noctua does 3000 RPM at 19dB. I don't know what the stock (Sunon) rpm is. Surely, the 3000 rpm should suffice for our purposes.
Have you been able to compare your TPA3255 amp running on the Connex SMPS versus the modified Mean Well SMPS?
My amp is 3" tall too. The only thing which worries me in that these enclosures don't have ventilation at the back. I want to put 2 fans at the back for the amps.
On the 350mm looks like they are on the top and bottom. Mine (300mm)are on the side. I guess you could always drill holes in the back. ??
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FYI the Meanwell SE-600 stock fan is a Sunon KD1206PTB1 1.4w possibly rated at 23.5 CFM/4000+ RPM and ~34dB. Appears to be obsolete with varying specs but that's the ballpark.
Ordered this from TI on 12/15. status says sent to Fulfillment, has been for 2 weeks. No emails from TI other than order confirmation. Never ordered from them before, is this indicative of item not in stock or an order issue?
I installed the Noctua 60mm in the MW SE-600-48. The fan was not as loud as the stock fan but it was little louder than I thought. So I installed the noise adapter along with the fan. That has reduced the speed of the fan and also silenced the fan a bit. The noise is more from the airflow than the fan itself. The stock fan itself was louddddd.