L6712ADTR(2004) 데이터 시트보기 (PDF) - STMicroelectronics
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L6712ADTR Datasheet PDF : 27 Pages
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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
BAND-GAP
REFERENCE
(1.235V)
CONTROL
LOGIC
VIDx
INTERNAL REFERENCE
EXTERNAL REFERENCE
VID3
VID2
VID1
DAC
DIGITAL
SOFT-START
VPROG
ERROR
AMPLIFIER
REF_IN/OUT
FB
COMP
The output regulated voltage accuracy can be extracted from the following relationships (worst case con-
dition):
VOUT _TOT_ACC[ %]
=
VOUT_ACC [%]
+
KOS
⋅
V-----O----S---_---R---A--
VOUT
⋅
100
=
( ±0.9 %
)
+
KOS
⋅
(---±----8---m------V-----)
VOUT
⋅
100
(worst case with internal reference)
VOUT _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
+
KO
S
⋅
(---±---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 [%] =
(VOUT _ACC [%])2
+
KO
S
⋅
V-----O----S---_---R---A--
VOUT
⋅
100
2
(with internal reference)
9/27
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