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)： 37/70頁(yè)
文件大?。?/td> 572K
代理商： L6714TR
L6714
Voltage positioning
37/70
12.1
Droop function (Optional)
This method "recovers" part of the drop due to the output capacitor ESR in the load
transient, introducing a dependence of the output voltage on the load current: a static error
proportional to the output current causes the output voltage to vary according to the sensed
current.
As shown in
Figure 11
, the ESR drop is present in any case, but using the droop function
the total deviation of the output voltage is minimized. Moreover, more and more high-
performance CPUs require precise load-line regulation to perform in the proper way.
DROOP function is not then required only to optimize the output filter, but also beacomes a
requirement of the load.
Connecting DROOP pin and FB pin together, the device forces a current I
DROOP
,
proportional to the read current, into the feedback resistor R
FB
implementing the load
regulation dependence. Since I
DROOP
depends on the current information about the three
phases, the output characteristic vs. load current is then given by:
Where R
SENSE
is the chosen sensing element resistance (Inductor DCR or LS R
dsON
) and
I
OUT
is the output current of the system.
The whole power supply can be then represented by a "real" voltage generator with an
equivalent output resistance R
DROOP
and a voltage value of V
REF
. R
FB
resistor can be also
designed according to the R
DROOP
specifications as follow:
Droop function is optional, in case it is not desired, the DROOP pin can be disconnected
from the FB and an information about the total delivered current becomes available for
debugging, and/or current monitoring. When not used, the pin can be shorted to SGND.
Figure 11. Voltage positioning (left) and droop function (right)
V
OUT
V
REF
R
FB
I
DROOP
–
V
REF
R
FB
R
Rg
---------------------
I
OUT
–
V
REF
R
DROOP
I
OUT
–
=
=
=
R
FB
R
DROOP
R
SENSE
---------------------
=
I
D
V
REF
FB
COMP
I
O
VSEN
64k
FBR
FBG
6
64k
6
R
F
C
F
R
FB
(Remote Sense)
ESR Drop
V
MAX
V
MIN
V
NOM
RESPONSE WITHOUT DROOP
RESPONSE WITH DROOP
DROOP
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