We are considering using TPSM843B22 as a power supply for Intel Aria10 SoC.
This FPGA has pins for remote sensing called VCCLSENSE and GNDSENSE.
We are thinking of connecting FB to VCCLSENSE and GOSNS to GNDSENSE, but is it possible to connect like this?
Also, what values will RFBT and RFBB be in this case?
TPSM843B22's VOUT outputs 0.9V.
This is an example for the IC layout but it will be the same for the module.
Connect the FB and GOSNS similar to the image below.
Place traces to the VCCLSENSE and GNDSENSE pin, there should be a ceramic capacitor on the VCCLSENSE and GNDSENSE.
The feedback resistors should be near the regulator.
1. No, connect on vout side of the feedback resistor connected to FB and GOSNS (drawn red box (Cf) when using remote resistors).
Usually, there are 2 resistors (0 ohm) for the remote sense and 2 resistors (100ohm when using remote, 0 ohm when not using remote)
local sense near the inductor. The local sense is a fail safe prevents open connection on feedback for when the processor is removed.
2 The VCCLSENSE and GNDSENSE are kelvin connections to the die. There should capacitors on the VCCL and GND supply rail.
3 I do not understand.
4 approximately ~100pF to 1000pF.
The capacitor is not placed between FB and GOSNS. The capacitor is placed between Vout and GOSNS near feedback resistors
Why do you also connect the local sense side (VDDOUT and GND) with 100ohm? See image. If the processor is removed, the remote feedback (0 ohm path) is open and will not be connected to the output, The 100 ohms are used so that if processor is not installed or removed from a socket the power supply will regulate and can be tested.
