SMPS 45V

[rdalem]

I am going to build a module around 3255 class d and need SMPS 45V. Where do you buy this?

 

[Kay Pirinha]

Go for the more common voltage of 48 V. Most stock SMPS's, especially Meanwell products, are adjustable if you really need those 45 V.

Best regards!

 

[rdalem]

I must not exceed 45V. Would not really have had adjustable as this can easily cause interference.

 

[Nisbeth]

Where is the hard 45V limitation coming from? I don't see how the chip or any surrounding components can create that limit?

Also, the adjustment is just a variable resistor so I don't see how that could create any additional interference in a well-designed commercial PSU.

 

[Kay Pirinha]

For instance, see Meanwell's RSP-500-48, whose output voltage is adjustable from 41 to 56 V. If it's DC power of 500 W isn't enough, there are bigger ones also.

Note: TPA3255's maximum supply voltage is 53.5 V.

Best regards!

 

[rdalem]

According to this test, anything above 45V is risky for the TPA3255;

 

[Nisbeth]

Can't really be arsed to watch 20+ mins of video to understand it, sorry - what's the problem that is being pointed to?

 

[rdalem]

If you can watch from 18-19 minutes, you will see that it is referenced that the capacitors will break at 48 Volts.

 

[rdalem]

For instance, see Meanwell's RSP-500-48, whose output voltage is adjustable from 41 to 56 V. If it's DC power of 500 W isn't enough, there are bigger ones also.

Note: TPA3255's maximum supply voltage is 53.5 V.

Best regards!

This is relatively expensive for an SMPS, presumably because it is adjustable.

 

[russc]

Buy a module with higher voltage caps or use 36V and see if you notice the difference.

 

[Kay Pirinha]

If you can watch from 18-19 minutes, you will see that it is referenced that the capacitors will break at 48 Volts.

This isn't a TPA3255 property, but of the peripheral components. My TI EVM3255 board survives long party nights without issues.

Best regards!

 

[rdalem]

@Kai Pirinha. Dare I ask which SMPT you use on this?

 

[e_fortier]

This is relatively expensive for an SMPS, presumably because it is adjustable.

Simply use the less expensive LRS-350-48 which is also adjustable and highly recommended by many builders.

 

[Kay Pirinha]

@Kai Pirinha. Dare I ask which SMPT you use on this?

It's the Meanwell HRPG-600-48. But wow, I see that it has become even more $$$$ in the last four years 😱😱😱!

Best regards!