Honored Contributor
Honored ContributorHello, Dave!
Your answers regarding the usage of 1117 LDOs to power Cyclone IV seem to be controversial: ---------------------------------------------------------------------------------- --- Quote Start --- The 3.3v, 2.5v and 1.2v are generated with standard 1117 ldos with a bypassing 22uF tantalum capacitor. --- Quote End --- --- Quote Start --- this design looks good to me. --- Quote End --- ---------------------------------------------------------------------------------- --- Quote Start --- Why Power Supply on "Cyclone IV GX FPGA Development Kit" is so sophisticated? why not use simple 3-pin ldo instead of multi-pin Linear Regulators used on this Kit? --- Quote End --- --- Quote Start --- FPGAs have a power-on requirement that the power rails ramp in a well-defined time period. Multi-pin linear regulators generally have enable and soft-start functions that can be used to aid in power-on sequencing. a simple 3-pin linear regulator does not provide this functionality. --- Quote End --- ----------------------------------------------------------------------------------
