In intel huron river platform，sandy bridgeCPU, the vcc_core current request is as follows:Iccmax=94A,Itdc=52A,Idynmax=66A, that is the same as the TPS51640 reference demo shecmatic's request. the TPS51640's external design schematic is mostly followed the datasheet. The difference between the reference shcmatic and mine is the inductor. I used 0.47uH 2.5mΩ. I used sandy bridge i7 CPU, the frequecy is 2.1GHz, but I only use less than 1.2GHz. if in the higher frequency the M/B will shut down. even though it can work in low frequency, the parameters which contais EIST,C3,C6 and C7 are needed set disable.
I found in page27of the TPS51640 datasheet, there is a parameter VHFM whose value is 0.9V. what is the meaning of the 0.9v? Is it the max value or min value? In the expriment when the MB work normally, the cpu_core is low than 0.9v. I think there is maybe relation.
I hope received your reply as soon as possible. Thank you very much!
