Other Parts Discussed in Thread: UCD7242
Hello,
I am working on a new design with the TMS320C6678ACYP DSP. For the CVDD and CVDD1 power rails I am designing with the UCD9222 and the UCD7242 (synchronous mode). Channel 1 of the devices will use the VID from the DSP to set the output voltage. Channel 2 of the UCD9222 will be programmed to provide the CVDD 1.0V level. For the UCD7242 output bypass capacitors and inductor, I am following the EVM design, same for the DSP decoupling capacitors. I’m thinking about 799KHz for the switching frequency based on the EVM. My anti-alias filter for the EADCs on the UCD9222 consists of a 1K resistor and a 560pF capacitor. The TI C6678 power consumption spreadsheet estimates I need 9.1A of CVDD and 1.7A of CVDD. After reading all of the documents I cannot find any discussion about the output voltage accuracy of this arrangement. What output DC voltage accuracy should I expect for the CVDD and the CVDD1 voltage rails? Thanks for your help.
Larry
