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參數(shù)資料
| 型號： | L6712QTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| 中文描述： | 兩相交錯DC / DC控制器 |
| 文件頁數(shù)： | 9/27頁 |
| 文件大?。?/td> | 1074K |
| 代理商： | L6712QTR |
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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 V
OS_RA
and V
OS_EA
are the offsets related to the Error Amplifier and the Remote Amplifier respec-
tively and K
OS
= 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
V
PROG
ERROR
AMPLIFIER
FB
COMP
INTERNAL REFERENCE
EXTERNAL REFERENCE
V
OUT_TOT_ACC
%
[
]
V
OUT_ACC
%
[
]
K
OS
V
V
OUT
--------------------
100
+
0.9%
±
(
)
K
OS
V
OUT
---------------------
100
)
+
=
=
V
OUT_TOT_ACC
%
[
]
EXT_REF_Accuracy[%]
V
REF_IN/OUT
------------------------------------
[%]
V
EXT_REF
--------------------------
100
K
OS
V
V
OUT
--------------------
100=
+
+
+
=
EXT_REF_Accuracy[%]
2.0%
±
(
)
EXT_REF
--------------------------
100
K
OS
V
out
---------------------
100
)
+
+
+
=
V
OUT_TOT_ACC
[%]
V
OUT_ACC
[%]
(
)
2
K
OS
V
V
OUT
--------------------
100
+
2
=
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