Is it possible for LTM4637 to generate negative output? eg:12V input -5v output 20A?
I checked Phase Margin (PM) using LTpowerCAD about LTM4637.
I loaded default solution in LTpowerCAD.
When Iout = 20 A, Phase + 180 deg is enough in all frequency.
When Iout = a few A,
Iout = 数Aの場合、PM > 70 deg
However, Phase + 180 deg < 20 deg @ …
You are right. Buck uModules can be used to give negative output voltage. LTM4601/02, LTM4637 can all be used in these applications.
The output of uModule should be connected to system GND and GND of uModule connect to -Vout. This is a buck-boost configuration…
The LTM4637 schematic (U1A, U2A, U3A, U11A, U13A) look ok.
If the regulator is kept very close to the FPGA, the 4# 680uF could serve as the output caps for LTM4637. Usually, these capacitance is enough for normal operation of LTM4637. But for the system, how much capacitance are needed depends on the