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)： 59/70頁(yè)
文件大?。?/td> 572K
代理商： L6714
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
相關(guān)PDF資料
PDF描述
L6714TR 4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs
L6726A Single phase PWM controller
L6726ATR Single phase PWM controller
L6727 Single phase PWM controller
L6727TR Single phase PWM controller
相關(guān)代理商/技術(shù)參數(shù)
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