參數(shù)資料
型號： L6713ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PQFP64
封裝： 10 X 10 MM, TQFP-64
文件頁數(shù)： 48/64頁
文件大?。?/td> 801K
代理商： L6713ATR
System control loop compensation
L6713A
52/64
21
System control loop compensation
The control loop is composed by the current sharing control loop (See Figure 9) 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 25 shows the block
diagram of the system control loop.
The system control loop is reported in Figure 26. The current information IDROOP sourced by
the DROOP pin flows into RFB implementing the dependence of the output voltage from the
read current.
Figure 25.
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):
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 parallel of the N 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 3 V.
L3
L2
L1
PWM3
PWM2
PWM1
4 / 5
VREF
ERROR AMPLIFIER
COMP
FB
ZF(s)
ZFB(s)
DROOP
IDROOP
COUT
ROUT
1 / 5
CURRENT SHARING
DUTY CYCLE
CORRECTION
IINFO1
IINFO3
IINFO2
(PHASE2 Only applies when using 3-PHASE Operation)
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
4
5
---
V
IN
ΔV
OSC
-------------------
=
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相關(guān)代理商/技術(shù)參數(shù)
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