參數(shù)資料
型號(hào)： L6701TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36
封裝： LEAD FREE, SSO-36
文件頁(yè)數(shù)： 29/44頁(yè)
文件大?。?/td> 627K
代理商： L6701TR
Obsolete
Product(s)
- Obsolete
Product(s)
L6701
15 System Control Loop Compensation
35/44
15
System Control Loop Compensation
The control loop is composed by the Current Sharing control loop (See Figure 17) 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 17 shows the block diagram of the
system control loop.
The system Control Loop is reported in Figure 18. The current information IDROOP sourced by
the DROOP pin flows into RFB implementing the dependence of the output voltage from the
read current.
Figure 17. Main Control Loop
The system can be modeled with an equivalent single phase converter which only difference is
the equivalent inductor L/3 (where each phase has an L inductor).The Control Loop gain results
(obtained opening the loop after the COMP pin):
Where:
●
is the equivalent output resistance determined by the droop function
(
for fully differential current sense);
●
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 three inductor impedance;
●
A(s) is the error amplifier gain;
L3
L2
L1
PWM3
PWM2
PWM1
4 / 5
Reference
ERROR AMPLIFIER
COMP
FB
ZF(s)
IDROOP
COUT
ROUT
1 / 5
CURRENT SHARING
DUTY CYCLE
CORRECTION
IINFO1
IINFO3
IINFO2
G
LOO P 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
D ROOP
DCR
R
D
------------- RFB
=
R
DR OO P
3
DCR
R
D
------------- RFB
=
相關(guān)PDF資料
PDF描述
L6712DTR 2 A SWITCHING CONTROLLER, PDSO28
L6712Q 2 A SWITCHING CONTROLLER, QCC36
L6712ADTR 2 A SWITCHING CONTROLLER, PDSO28
L6712D 2 A SWITCHING CONTROLLER, PDSO28
L6712QTR 2 A SWITCHING CONTROLLER, QCC36
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