Guru
Joined: 05/03/2018
Location: NetherlandsPosts: 5902
| Posted: 06:51am 20 Jun 2025 |
Hi grogster,
In short: RP designed a switch mode power supply for the core voltage INSIDE the RP2350B. That switcher has possibility to adjust the core voltage to support over clocking.
But.. RP found out that the switcher is sensitive to noise, and specific noise generated from the coil that the switcher uses. Polarity of the coil (how it is wound) is key. And since there is no polarity indicator on small coils, problems are to be expected.
Hence Peter decided to avoid the issue, and use an external linear regulator for the core voltage. And if you want to "overclock" you have to set it for 1.3V (normal core voltage is 1.1V for 150MHz).
That is the short story,
Volhout
Edited 2025-06-20 16:52 by Volhout