參數(shù)資料
型號(hào)： L6706
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, QCC40
封裝： 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40
文件頁(yè)數(shù)： 35/47頁(yè)
文件大小： 623K
代理商： L6706
System control loop compensation
L6706
40/47
Doc ID 15698 Rev 2
18
System control loop compensation
The control loop is an average current mode control loop (see Figure 5): the output voltage
is equal to the reference programmed by VID minus the droop function terms.
The system control loop is reported in Figure 24. The current information IDROOP sourced by
the FB pin flows into RFB implementing the dependence of the output voltage from the read
current.
Figure 23.
Main control loop
The control loop gain results (obtained opening the loop after the COMP pin):
Where:
DCR is the Inductor parasitic resistance;
is the equivalent output resistance determined by the droop function;
ZP(s) is the impedance resulting by the parallel of the output capacitor (and its ESR) and the
applied load RO;
ZF (s) is the compensation network impedance;
ZL (s) is the inductor impedance;
A (s) is the error amplifier gain;
is the PWM transfer function where
ΔV
OSC is the oscillator ramp amplitude
and has a typical value of 1.5 V.
Removing the dependence from the error amplifier gain, so assuming this gain high enough,
and with further simplifications, the control loop gain results:
The system control loop gain (see Figure 23) is designed in order to obtain a high DC gain
to minimize static error and to cross the 0dB axes with a constant -20 dB/dec slope with the
L
PWM
VREF
ERROR AMPLIFIER
COMP
FB
ZF(s)
ZFB(s)
IDROOP
COUT
ROUT
G
LOOP s
()
PWM Z
F s
() R
DROOP
Z
P s
()
+
()
Z
P s
() Z
L s
()
+
[]
Z
F s
()
As
()
--------------
1
As
()
------------
+
R
FB
+
-------------------------------------------------------------------------------------------------------------------
–
=
R
DROOP
DCR
Rg
------------- R
FB
=
PWM
3
5
---
V
IN
ΔV
OSC
-------------------
=
G
LOOP
s
()
3
5
----
V
IN
ΔV
OSC
----------------------
Z
F
s
()
R
FB
---------------
R
O
R
DROOP
+
R
O
R
L
+
--------------------------------------------
1s C
O
R
DROOP
//R
O
ESR
+
()
+
s
2
C
O
L
s
L
R
O
---------
C
O
ESR
C
O
R
L
++
1
+
+
--------------------------------------------------------------------------------------------------------------------------------
–
=
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