L6712AQTR 데이터 시트보기 (PDF) - STMicroelectronics
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L6712AQTR Datasheet PDF : 29 Pages
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L6712A L6712
Figure 6. Reference Management
BAND-GAP
REFERENCE
(1.235V)
VID3
VID2
VID1
DAC
CONTROL
LOGIC
DIGITAL
SOFT-START
VIDx
INTERNAL REFERENCE
EXTERNAL REFERENCE
ERROR
AMPLIFIER
VPROG
REF_IN/OUT
FB
COMP
The output regulated voltage accuracy can be extracted from the following relationships (worst case con-
dition):
V O U T _TOT_ACC [ % ]
=
V O U T _ACC [ % ]
+
KOS
⋅
V-----O----S---_---R---A--
VOUT
⋅
100
=
( ±0.9 % )
+
KOS
⋅
-(--±---8----m------V-----)
VOUT
⋅
100
(worst case with internal reference)
V O U T _TOT_ACC [ % ] =
E
X
T
_REF
_Accuracy
[%]
+
---------V-----P---R----O----G-----------
R E F _IN/OUT
[%]
+
⎛
⎝
----V----O----S---_---E---A-----
EXT_REF
⋅
100⎠⎞
+
KOS
⋅
V-----O----S---_---R---A--
VOUT
⋅
100 =
=
E X T _REF _Accuracy [%]
+
(
± 2.0 % )
+
⎛
⎝
---(---±---5----m-----V-----)---
EXT_REF
⋅
100⎠⎞
+
KOS
⋅
-(--±---8----m------V-----)
Vout
⋅
100
(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:
VOUT_TOT_ACC[%] =
( V O U T _ACC [%] ) 2
+
⎝⎛ K O S
⋅
V-----O----S---_---R---A--
VOUT
⋅
100⎠⎞
2
(with internal reference)
VOUT_TOT_ACC[%] =
(
E
X
T
_REF
_Accuracy
[%]
)2
+
⎛
⎝
---------V-----P---R----O----G-----------
R E F _IN/OUT
[%]⎠⎞
2
+
⎛
⎝
----V----O----S---_---E---A-----
EXT_REF
⋅
100⎠⎞
2
+
⎛
⎝
KO
S
⋅
V-----O----S---_---R---A--
VOUT
⋅
100⎠⎞
2
(with external reference)
10/29
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