Topping P50 5V Output Current

[wgh52]

Hello Everyone.

My question may sound like a newbie question, but I'm unsure, so I ask you folks...

I want to use a Topping P50 for it's neat design, compact size and seemingly sufficient current output capability.

My application needs a total of 1.6A on the 5V rail.
The P50 supplies 2x 1A on separate rails
The Regulator App Note states that the chips may be paralleled to achieve more output current capability and understood from the app note that 0R1 resistors in each output line would help to more evenly split the output current...

Here are my questions:
If I just parallel the P50 outputs with a Y-cable, will it "survive" 1.6A @ 5V?
My plan is to e.g. place some additional passive cooling on the back side where the regulators sit. Which other provisions would I have to take to make paralleling for 1.6A safe?

Thanks and Regards,
Winfried

 

[Eddy]

I asked myself a similar question: I have a WiiM Pro requiring 1.5A @ 5V according to the manual. I just tried to run it with the P50 and it works flawlessly. I use only one of the 5V outputs at the moment but it also worked in the past using the second 5V output supplying a miniDSP DDRC-22D.

So, the WiiM Pro does not really require 1.5A or the P50 delivers more than just 1A.

Are you sure that the 2x1A are really separate? Or is it just 2V in total?
Someone posted in another forum: "The Topping P50 power supply states that it is 2 x 5A 5VDC. Since they are stacked in parallel on the board and only a single USB port is used, the maximum total rating for a single USB port should be 2 A."

 

[Eddy]

More generally, is there really a risk of damaging the power supply if the supplied device tries to draw more power from the power supply than possible?
Or would the only consequence be that the supplied device would not work?

 

[wgh52]

Hello Eddy,

let me answer from my current knowledge...

The Topping P50 has three connectors:

2x USB-A - 5V each - 1A max. each
1x Koax - 15V - 1A max.

each supplied by an individual regulator:

It is NOT allowed to draw all three outputs with 1A each at the same time! Topping gives examples of allowed combinations on the product page:

The 1A limitation on each of the outputs seems to be the (specified) current limit of the individual voltage regulators (provided sufficient individual and complete cooling): But if all outputs are used, (I think...) the heat dissipation of the Alu housing itself poses a dissipation limit. So, my GUESS is that the current draw of 1A on all outputs at the same time would/could be allowed if:
1. the transformer is capable of the complete power draw (which I cannot guarantee from the size it has...)
2. sufficient additional cooling is mounted on the P50 back plate (the regulators are directly/thermally attached to that) to help dissipate heat

I'm not certain myself IF my own application drawing 2x 1A/5V and 1x 0.2A/15V yould not kill the unit...

Happy New Year!
Winfried