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L6712A 데이터시트(PDF) 9 Page - STMicroelectronics |
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L6712A 데이터시트(HTML) 9 Page - STMicroelectronics |
9 / 27 page 9/27 L6712A L6712 The device offers a bi-directional pin REF_IN/OUT: the internal reference used for the regulation is usually available on this pin with 3mA of maximum current capability except when VID code 111 is programmed; in this case the device accepts an external reference through the REF_IN/OUT pin and regulates on it. When external reference is used, it must range from 0.800V up to 3.300V to assure proper functionality of the device. Figure 2 shows a block schematic of how the Reference for the regulation is managed when internal or external reference is used. The voltage identification (VID) pin configuration or the external reference provided also sets the power- good thresholds (PGOOD) and the Over/Under voltage protection (OVP/UVP) thresholds. Figure 2. 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) 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 O U T _TOT_ACC % [] V OUT_ACC % [] K OS V OS_RA V OUT -------------------- 100 ⋅⋅ + 0.9% ± () K OS 8mV ± () V OUT --------------------- 100 ⋅⋅ + == V O U T _TOT_ACC % [] EXT_REF_Accuracy[%] V PR O G 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 O U T _TOT_ACC [%] V OUT _ACC [%] () 2 K OS V OS_RA V OUT -------------------- 100 ⋅⋅ + 2 = |
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