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Isn't more than 3A at 5V out of USB-PD 2 and 3 spec? You can set max 3A amp for USB PD with just placing a 5.1k resistor on each USB CC line without the need fo
by sschueller 3y ago
Isn't more than 3A at 5V out of USB-PD 2 and 3 spec? You can set max 3A amp for USB PD with just placing a 5.1k resistor on each USB CC line without the need for a USB PD IC.
If you need more you would need to request for example 20V at 5A and then buck convert it down to 5V. Not ideal but you can at least pull the current you need through thinner cables and you also have enough to power external USB devices.
- Kirby64 3y agoThe “normal” way to support 25W would be to support 9V 3A input, giving 27W adapters functionality. Or possibly accept multiple options such as 9, 12, and 15, and then buck any of those down to the system voltage needed. The 5V5A is because raspberry pi org is being cheap/lazy and doesn’t want to design or pay for a power converter to handle that on the pi, and instead is pushing that complexity/cost to the user via an overpriced and nonstandard supply.