參數(shù)資料
型號(hào)： L6717
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48
文件頁(yè)數(shù)： 46/56頁(yè)
文件大?。?/td> 1081K
代理商： L6717
System control loop compensation
L6717
50/56
Doc ID 17326 Rev 1
Figure 18.
Control loop bode diagram and fine tuning (not in scale)
To obtain the desired shape an RF-CF series network is considered for the ZF(s)
implementation. A zero at
ω
F=1/RFCF is then introduced together with an integrator. This
integrator minimizes the static error while placing the zero
ω
F in correspondence with the L-
C resonance assures a simple -20 dB/Dec. shape of the gain.
In fact, considering the usual value for the output filter, the LC resonance results to be at
frequency lower than the above reported zero.
Compensation network can be simply designed placing
ω
F=ωLC and imposing the cross-
over frequency
ω
T as desired obtaining (always considering that ωT might be not higher than
1/10th of the switching frequency FSW):
11.1
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 18):
–
Increase RF to increase the system bandwidth accordingly;
–
Decrease RF to decrease the system bandwidth accordingly;
–
Increase CF to move ωF 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 (dMAX) 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 VOUT (while it is charged by dMAXVIN-VOUT during a load
appliance).
dB
ω
ZF(s)
GLOOP(s)
K
ω
LC = ωF
ω
ESR
ω
T
RF[dB]
dB
ω
ZF(s)
GLOOP(s)
K
ω
LC = ωF
ω
ESR
ω
T
RF[dB]
RF
CF
R
F
R
FB
ΔV
OSC
V
IN
----------------------------------
3
5
---
ω
T
L
NR
LL
ESR
+
()
-------------------------------------------
=
C
F
C
O
L
R
F
--------------------
=
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