STARLINK MESH ROUTER DRIVER

The operational amplifier channel 1 measures Dishy current on 0.05 Ohm shunt. “Dishy PWR ON” should be connected to the PoE controller, so the 50V is applied only when the controller detects the connected PD controller on the other side (Dishy). It’s always important to drive power MOSFET properly.

STARLINK MESH ROUTER DRIVER

There is a driver circuit on two transistors. Q1 MOSFET switches 50V supply for the Dishy. I marked unknown lines and questionable components with the “?” symbol. I didn’t have time to build it to scale or paint it.Ĭlick on the image for the full resolution. Please excuse the crudity of these schematics. An additional circuit that “lifts” the ground for about 0.5 V allows the amplifier to measure lower values, down to 0 V. Interesting to note that the Vss pin of the operational amplifier is not connected to the ground directly. Or, all of this might be an effect of the chip shortage 🙂 It might be the requirements of the PoE controller IC. But, in this case, they decided to use an external amplifier for some reason. Typically, the current shunt is connected to the PoE controller directly. It’s all about only the voltage difference. Due to high impedance, there is no current flow to the operational amplifier input. This means that the operational amplifier it’s a current measurement circuit.īasically, the operational amplifier measures voltage difference across the shunt terminals. On the right, there is an operational amplifier and many transistors.Ī big 0.05 Ohm SMD resistor, it’s a definitely current shunt. I suspect that it might be something from the LTC lineup. Unfortunately, I couldn’t find any information about the PoE PSE controller. I’m not sure that SpaceX 100% follows the standard here. 50V and 2A power supply means that Starlink uses 4-pair 802.3bt PoE.

Starlink mesh router