參數(shù)資料
型號(hào)： L6714TR
廠商： 意法半導(dǎo)體
英文描述： 4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs
中文描述： 4英特爾VR10，VR11和AMD的6位嵌入式CPU的司機(jī)相控制器
文件頁(yè)數(shù)： 61/70頁(yè)
文件大?。?/td> 572K
代理商： L6714TR
L6714
Tolerance band (TOB) definition
61/70
23
Tolerance band (TOB) definition
Output voltage load-line varies considering component process variation, system
temperature extremes, and age degradation limits. Moreover, individual tolerance of the
components also varies among designs: it is then possible to define a Manufacturing
Tolerance Band (TOB
Manuf
) that defines the possible output voltage spread across the
nominal load line characteristic.
TOB
Manuf
can be sliced into different three main categories: Controller Tolerance, External
Current Sense Circuit Tolerance and Time Constant Matching Error Tolerance. All these
parameters can be composed thanks to the RSS analysis so that the manufacturing
variation on TOB results to be:
Output voltage ripple (V
P
= V
PP
/2) and temperature measurement error (V
TC
) must be
added to the Manufacturing TOB in order to get the system Tolerance Band as follow:
All the component spreads and variations are usually considered at 3
σ
. Here follows an
explanation on how to calculate these parameters for a reference L6714 application.
23.1
Controller tolerance (TOB controller)
It can be further sliced as follow:
Reference tolerance. L6714 is trimmed during the production stage to ensure the
output voltage to be within k
VID
= ±0.5% (±0.6% for AMD DAC) over temperature and
line variations. In addition, the device automatically adds a -19mV offset (Only for Intel
Mode) avoiding the use of any external component. This offset is already included
during the trimming process in order to avoid the use of any external circuit to generate
this offsets and, moreover, avoiding the introduction of any further error to be
considered in the TOB calculation.
Current Reading Circuit. The device reads the current flowing across the MOSFET
RdsON or the inductor DCR by using its dedicated differential inputs. The current
sourced by the VRD is then reproduced and sourced from the DROOP pin scaled down
by a proper designed gain as follow:
R
---------------------
=
●
●
This current multiplied by the R
FB
resistor connected from FB pin vs. the load allows
programming the droop function according to the selected R
L
/Rg gain and R
FB
resistor.
Deviations in the current sourced due to errors in the current reading, impacts on the output
voltage depending on the size of R
FB
resistor. The device is trimmed during the production
stage in order to guarantee a maximum deviation of k
IFB
= ±1
μ
A from the nominal value.
Controller tolerance results then to be:
TOB
Manuf
TOB
Controller
2
TOB
CurrSense
2
TOB
TCMatching
2
+
+
=
TOB
TOB
Manuf
V
P
V
TC
+
+
=
I
DROOP
Rg
I
OUT
TOB
Controller
VID
19mV
–
(
)
k
VID
[
]
2
k
IDROOP
R
FB
(
)
2
+
=
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