參數(shù)資料
型號(hào)： L6711
廠商： 意法半導(dǎo)體
英文描述： 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs
中文描述： 3相控制器，動(dòng)態(tài)VID和可選數(shù)模轉(zhuǎn)換器
文件頁數(shù)： 18/38頁
文件大小： 591K
代理商： L6711
L6711
18/38
The information about the total current delivered (I
DROOP
) is sourced from the FB pin (see Figure 10): con-
necting a resistor between this pin and VSEN (i.e. the output voltage), the total current information flows
only in this resistor because the compensation network between FB and COMP has always a capacitor in
series (C
F
, see Figure 10). The voltage regulated is then equal to:
Where VID is the reference programmed through VIDx and VID_SEL (Only the I
DROOP
contribute to I
FB
has been considered).
Since I
DROOP
depends on the current information about the three phases, the output characteristic vs. load
current is given by:
Where R
SENSE
is the chosen sensing element resistance (Inductor DCR or LS R
dsON
), I
OUT
is the output
current of the system and R
DROOP
is its equivalent output resistance (The whole power supply can be then
represented by a "real" voltage generator with a voltage value of VID and an equivalent series resistance
R
DROOP
).
R
FB
resistor can be also designed according to the R
DROOP
specifications as follow:
8.2
The OFFSET pin allows programming a positive or a negative offset (V
OS
) for the output voltage.
When the Integrated Thermal Sensor is disabled (TC = SGND) a resistor R
OFFSET
connected vs. SGND
increases the output voltage: since the pin is internally fixed at 1.240V, the current programmed by the
resistor R
OFFSET
is mirrored and then properly subtracted from the I
FB
current (see Figure 11) as follow
(Only the I
OFFSET
contribute to I
FB
has been considered):
OFFSET
Figure 11. Voltage Positioning with Offset
The device will add the programmed offset V
OS
to the output programmed voltage (considering now also
the droop effect) subtracting the relative offset current from the feedback current I
FB
:
Offset resistor can be designed by considering the following relationship (R
FB
is fixed by the Droop effect):
V
OUT
VID
R
FB
I
DROOP
–
=
V
OUT
VID
R
FB
I
DROOP
–
VID
R
FB
R
Rg
----------------------
I
OUT
–
VID
R
DROOP
I
OUT
–
=
=
=
R
FB
R
DROOP
R
SENSE
----------------------
=
V
OUT
VID
R
FB
I
OFFSET
+
VID
R
FB
R
OFFSET
-------------------------
+
VID
V
OS
+
=
=
=
1.240V
I
O
1:1
R
OFFSET
OFFSET
TC
I
DROOP
VID
FB
COMP
I
FB
VSEN
64k
FBR
FBG
6
64k
6
R
F
C
F
R
FB
(Remote Sense)
I
OFFSET
V
OUT
VID
R
FB
I
FB
–
VID
R
FB
I
DROOP
I
OFFSET
–
(
)
= VID
R
FB
I
OFFSET
R
DROOP
I
OUT
–
+
–
=
=
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