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L6712AD Datasheet(PDF) 10 Page - STMicroelectronics |
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L6712AD Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 29 page L6712A L6712 10/29 Figure 6. Reference Management The output regulated voltage accuracy can be extracted from the following relationships (worst case con- dition): (worst case with internal reference) (worst case with external reference) where VOS_RA and VOS_EA are the offsets related to the Error Amplifier and the Remote Amplifier respec- tively and KOS = 1+1/RA_Gain reflects the impact of the Remote Amplifier Gain (RA_Gain) on the regula- tion (see relevant section). A statistical analysis could consider applying the root-sum-square (RSS) method to calculate the precision since all the variables are statistically independent as follow: (with internal reference) (with external reference) BAND-GAP REFERENCE (1.235V) DAC VID3 VID2 VID1 REF_IN/OUT CONTROL LOGIC VIDx DIGITAL SOFT-START VPROG ERROR AMPLIFIER FB COMP INTERNAL REFERENCE EXTERNAL REFERENCE V OUT_TOT_ACC % [] V OUT_ACC % [] K OS V OS_RA V OUT -------------------- 100 ⋅⋅ + 0.9% ± () K OS 8mV ± () V OUT --------------------- 100 ⋅⋅ + == V OUT_TOT_ACC % [] EXT_REF_Accuracy[%] V PROG REF_IN/OUT ------------------------------------- [%] V OS_EA EXT_REF --------------------------- 100 ⋅ ⎝⎠ ⎛⎞ K OS V OS_RA V OUT -------------------- 100= ⋅⋅ ++ + = EXT_REF_Accuracy[%] 2.0% ± () 5mV ± () EXT_REF --------------------------- 100 ⋅ ⎝⎠ ⎛⎞ K OS 8mV ± () V out --------------------- 100 ⋅⋅ ++ + = V OUT_TOT_ACC [%] V OUT_ACC [%] () 2 K OS V OS_RA V OUT -------------------- 100 ⋅⋅ ⎝⎠ ⎛⎞ + 2 = V OUT_TOT_ACC [%] = EXT_REF_Accuracy[%] () 2 + V PROG REF_IN/OUT ------------------------------------- [%] ⎝⎠ ⎛⎞ 2 + V OS_EA EXT_REF --------------------------- 100 ⋅ ⎝⎠ ⎛⎞ 2 +K OS V OS_RA V OUT -------------------- 100 ⋅⋅ ⎝⎠ ⎛⎞ 2 |
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