Release PS2-PSU

[Legend]

Upon getting my PS2-PSU board in and being able to test it, I feel confident enough to be able to release the files for those who may want to build one themselves or modify it to their liking.

GitHub - LegendOfRock69/PS2-PSU: A power supply unit for an advanced trimmed SCPH-7900X Model Playstation 2 Slim

A power supply unit for an advanced trimmed SCPH-7900X Model Playstation 2 Slim - LegendOfRock69/PS2-PSU

github.com

Please note that this is not a drop-in solution for portables and I would NOT connect this to a battery, rather its a means of powering a trimmed PS2 (or one with its voltage regulating components removed) externally via USB-C. All of the information is outlined in the github repo however if there are any issues, please dont hesitate to reach out!

I will most likely be coming out with a similar board in the near future that can be used in a portable in conjunction with a battery protection PCB as well as a charging circuit of some sort similar to how customledmods' board is used. In the later future, I will also share a full fledged PMS solution once it is designed, built, and extensively tested.

If modifications are made to the files, I only ask that you reach out and show me as I want to be able to see the cool things people are doing with it!

 

[Customledmods]

Thanks for sharing with us I like how you implemented the usb c port into your design.

Btw the board @Mister M built has no charging circuit onboard it still requires an external bms to charge batteries.

 

[Legend]

I probably worded that wrong! I meant to say "similar to how customledmods board is used in conjunction with a bms etc."

I'll edit that now to avoid confusion!

 

[weirdmod]

Very cool

 

[BetterThanWireWrap]

What led to you choosing to use an LDO for 1V8?

 

[Legend]

What led to you choosing to use an LDO for 1V8?

As per the definitive PS2 trimming guide, the 1.75v rail on the PS2 is known to be sensitive and has the potential to cause booting issues when using a switching regulator so I used an LDO which has a more smooth output to combat this. This board was personally just for testing when it came to my use case and I typically wouldn't use an LDO in a battery powered application as it can be less efficient and generate more heat as the LDO dissipates power as heat.

A switching regulator can be used but the decoupling capacitor and inductor choice is pretty crucial to avoid as much noise on the voltage rail as possible.

*Edit*
To add to this, that's why I recommend it not be used with a battery. You could plug one in and have it work, but it would be less efficient and the 5v regulator wouldn't work given you're using a 3.7v 1s configuration as it's a step down buck regulator and not a boost regulator.

The regulators used can only handle a 5.5v maximum input voltage so using a 2s configuration to try to properly power the 5v reg is out of the question

 

[Stitches]

To expand on Legend's explanation, the 1.75v, 2.5v, and 3.5v lines each use around 0.1A of peak current. With that tiny power draw, the thermal inefficiency of using linear regulators (which are currently nigh required for their stability) are negligible. If a perfectly stable switching reg was found to serve that purpose, you'd only stand to gain like 5 minutes of runtime maximum.

 

[RegDogg]

Sounds like I will have another project for testing my PS2 trims in the future! Thanks for sharing this man!!

 

[BetterThanWireWrap]

To expand on Legend's explanation, the 1.75v, 2.5v, and 3.5v lines each use around 0.1A of peak current. With that tiny power draw, the thermal inefficiency of using linear regulators (which are currently nigh required for their stability) are negligible. If a perfectly stable switching reg was found to serve that purpose, you'd only stand to gain like 5 minutes of runtime maximum.

I figured that was the case, out of curiosity is that you quoting from memory or is there some resource that I missed?

 

[Stitches]

I figured that was the case, out of curiosity is that you quoting from memory or is there some resource that I missed?

Both. I remembered that only the 1.25v line draws meaningful current because I read it in The PS2 Trimming Guide. It has the current draw figures for each voltage line in the advanced trim section

 

[BetterThanWireWrap]

Both. I remembered that only the 1.25v line draws meaningful current because I read it in The PS2 Trimming Guide. It has the current draw figures for each voltage line in the advanced trim section

As per the definitive PS2 trimming guide, the 1.75v rail on the PS2 is known to be sensitive and has the potential to cause booting issues when using a switching regulator so I used an LDO which has a more smooth output to combat this. This board was personally just for testing when it came to my use case and I typically wouldn't use an LDO in a battery powered application as it can be less efficient and generate more heat as the LDO dissipates power as heat.

A switching regulator can be used but the decoupling capacitor and inductor choice is pretty crucial to avoid as much noise on the voltage rail as possible.

*Edit*
To add to this, that's why I recommend it not be used with a battery. You could plug one in and have it work, but it would be less efficient and the 5v regulator wouldn't work given you're using a 3.7v 1s configuration as it's a step down buck regulator and not a boost regulator.

The regulators used can only handle a 5.5v maximum input voltage so using a 2s configuration to try to properly power the 5v reg is out of the question

Thank you both much appreciated for the replies.

 

[FatBaldDad]

@Legend I got the components from DigiKey and am now working on getting a board made. Thank you so much for your work on this! This will be super helpful for troubleshooting, and I’m also interested in building a really small console.

Holy cow, this stuff is so much fun, and I’m only playing with the PS2s. I can’t venture outside this PS2 bubble... sensory overload!!!

 

[Legend]

@Legend I got the components from DigiKey and am now working on getting a board made. Thank you so much for your work on this! This will be super helpful for troubleshooting, and I’m also interested in building a really small console.

Holy cow, this stuff is so much fun, and I’m only playing with the PS2s. I can’t venture outside this PS2 bubble... sensory overload!!!

Love this!

I'm super glad somebody's already building one! Let me know how it goes or if you have any questions! Glad to be able to contribute and help out the community!

 

[cfc_12]

I'm just wondering

Why is there no 2.5v?

 

[Legend]

I'm just wondering

Why is there no 2.5v?

The PSU does a kind of hybrid of undervolting and technically overvolting by 500mV.

- So the PS2's 3.5v rail is ran off of 3.3v on the PSU
- Both the 2.5v and 1.75v rails on the PS2 are ran off of 1.8v on the PSU (hence why i said hybrid of undervolting and slightly overvolting as were running the 1.75v rail with 1.8v)
- and lastly the 1.25v rail on the PS2 runs off of 1v from the PSU