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L6711 数据表(PDF) 25 Page - STMicroelectronics

部件名 L6711
功能描述  3 Phase controller with dynamic VID and selectable DACs
PDF  50 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6711 数据表(HTML) 25 Page - STMicroelectronics

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L6711
Voltage positioning
25/50
Since IDROOP depends on the current information about the three phases, the output
characteristic vs. load current is given by:
Where RSENSE is the chosen sensing element resistance (Inductor DCR or LS RdsON), IOUT
is the output current of the system and RDROOP 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 RDROOP).
RFB resistor can be also designed according to the RDROOP specifications as follow:
Figure 10.
Voltage positioning with offset
10.2
Offset
The OFFSET pin allows programming a positive or a negative offset (VOS) for the output
voltage.
When the Integrated Thermal Sensor is disabled (TC = SGND) a resistor ROFFSET
connected vs. SGND increases the output voltage: since the pin is internally fixed at 1.240V,
the current programmed by the resistor ROFFSET is mirrored and then properly subtracted
from the IFB current (see Figure 10) as follow (Only the IOFFSET contribute to IFB has been
considered):
The device will add the programmed offset VOS to the output programmed voltage
(considering now also the droop effect) subtracting the relative offset current from the
feedback current IFB:
VID
R
FB
I
DR OOP
⋅
–
VID
R
FB
R
SENSE
Rg
--------------------- IOUT
⋅⋅
–
VID
R
DROOP
I
OUT
⋅
–
==
R
FB
R
DROOP
Rg
R
SEN SE
---------------------
⋅
=
1.240V
1:1
ROFFSET
OFFSET
TC
IDROOP
VID
FB
COMP
I
FB
VSEN
64k
FBR
FBG
64k
RF
CF
RFB
To Vcore
(Remote Sense)
IOFFSET
V
OUT
VID
R
FB
I
OFFSET
⋅
+
VID
R
FB
1.240V
R
OFFSET
------------------------
⎝⎠
⎛⎞
⋅
+
VID
V
OS
+
==
=
VID
R
FB
I
FB
⋅
–
VID
R
FB
I
D ROOP
I
OFFSET
–
() = VID R
FB
I
OFFSET
R
D ROOP IOUT
⋅
–
⋅
+
⋅
–
=



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