參數(shù)資料
型號(hào)： L6714
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)： 57/70頁(yè)
文件大小： 572K
代理商： L6714
L6714
System control loop compensation
57/70
21
System control loop compensation
The control loop is composed by the Current Sharing control loop (
See Figure 8
) and the
Average Current Mode control loop. Each loop gives, with a proper gain, the correction to
the PWM in order to minimize the error in its regulation: the Current Sharing control loop
equalize the currents in the inductors while the Average Current Mode control loop fixes the
output voltage equal to the reference programmed by VID.
Figure 22
shows the block
diagram of the system control loop.
The system Control Loop is reported in
Figure 23
. The current information I
DROOP
sourced
by the DROOP pin flows into R
FB
implementing the dependence of the output voltage from
the read current.
Figure 22. Main control loop
The system can be modeled with an equivalent single phase converter which only difference
is the equivalent inductor L/N (where each phase has an L inductor).The Control Loop gain
results (obtained opening the loop after the COMP pin):
L3
L2
L1
PWM3
PWM2
PWM1
4 / 5
V
REF
ERROR AMPLIFIER
COMP
FB
Z
F
(s)
Z
FB
(s)
DROOP
I
DROOP
C
OUT
R
OUT
1 / 5
1 / 5
1 / 5
CURRENT SHARING
DUTY CYCLE
CORRECTION
I
INFO1
I
INFO2
I
INFO3
I
INFO4
L4
PWM4
1 / 5
G
LOOP
s
( )
PWM
Z
s
( )
R
A s
Z
s
A s
( )
+
(
)
Z
P
s
( )
Z
L
s
( )
+
[
]
--------------
1
-----------
+
R
FB
+
------------------------------------------------------------------------------------------------------------------------
–
=
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