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
文件頁數(shù)： 59/70頁
文件大?。?/td> 572K
代理商： L6714TR
L6714
System control loop compensation
59/70
Compensation network can be simply designed placing
ω
F
=
ω
LC
and imposing the cross-over
frequency
ω
T
as desired obtaining (always considering that
ω
T
might be not higher than
1/10th of the switching frequency F
SW
):
R
V
IN
4
21.1
Compensation network guidelines
The Compensation Network design assures to having system response according to the
cross-over frequency selected and to the output filter considered: it is anyway possible to
further fine-tune the compensation network modifying the bandwidth in order to get the best
response of the system as follow (
See Figure 24
):
Increase R
F
to increase the system bandwidth accordingly;
Decrease R
F
to decrease the system bandwidth accordingly;
Increase C
F
to move
ω
F
to low frequencies increasing as a consequence the system
phase margin.
●
●
●
Having the fastest compensation network gives not the confidence to satisfy the
requirements of the load: the inductor still limits the maximum dI/dt that the system can
afford. In fact, when a load transient is applied, the best that the controller can do is to
“saturate” the duty cycle to its maximum (d
MAX
) or minimum (0) value. The output voltage
dV/dt is then limited by the inductor charge / discharge time and by the output capacitance.
In particular, the most limiting transition corresponds to the load removal since the inductor
results being discharged only by V
OUT
(while it is charged by d
MAX
V
IN
-V
OUT
during a load
appliance).
Referring to
Figure 24-left
, further tuning the Compensation network cannot give any
improvements unless the output filter changes: only modifying the main inductors ot the
output capacitance improves the system response.
Figure 24. R
F
-C
F
impact on bandwidth.
R
F
------------------------------------
5
--
ω
T
N
R
DROOP
ESR
+
(
)
----------------------------------------------------------
=
C
F
C
O
L
N
---
R
F
-----------------------
=
dB
ω
Z
F
(s)
G
LOOP
(s)
K
ω
LC
=
ω
F
ω
ESR
ω
T
R
F
[dB]
R
F
C
F
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