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L6711 Datenblatt(PDF) 29 Page - STMicroelectronics

Teilenummer L6711
Bauteilbeschribung  3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs
PDF  38 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6711 Datenblatt(HTML) 29 Page - STMicroelectronics

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L6711
Figure 21. Controller Power Dissipated (Quiescent + Switching; VCC = VCCDR = VBOOT = 12V)
17 SYSTEM CONTROL LOOP COMPENSATION
The control loop is composed by the Current Sharing control loop 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 Cur-
rent Mode control loop fixes the output voltage equal to the reference programmed by VID. Figure 22
shows the block diagram of the system control loop.
Figure 22. Main Control Loop Diagram
The average current mode control loop is reported in Figure 23. The current information IFB sourced by
the FB pin flows into RFB implementing the dependence of the output voltage from the read current.
The system can be modeled with an equivalent single phase converter which only difference is the equiv-
alent inductor L/3 (where each phase has an L inductor).The ACM control loop gain results (obtained
opening the loop after the COMP pin):
0
500
1000
1500
2000
2500
3000
100
300
500
700
900
Switching Frequency [kHz] per Phase
QG_HS=24nC
QG_LS=62nC
QG_HS=18nC
QG_LS=47nC
QG_HS=36nC
QG_LS=94nC
QG_HS=48nC
QG_LS=124nC
QG_HS=72nC
QG_LS=196nC
0
500
1000
1500
2000
2500
3000
100
300
500
700
900
Switching Frequency [kHz] per Phase
QG_HS=24nC
QG_LS=62nC
QG_HS=18nC
QG_LS=47nC
QG_HS=36nC
QG_LS=94nC
QG_HS=48nC
QG_LS=124nC
QG_HS=72nC
QG_LS=196nC
RGATE = RGATE_MOSFET = 0
RGATE_HS = 2.2
Ω; RGATE_LS = 3.3Ω; · RGATE_MOSFET = 1Ω
COMP
VID
FB
RFB
4/5
ZF(s)
ERROR AMPLIFIER
PWM3
PWM1
CURRENT
SHARING
DUTY CYCLE
CORRECTION
Co
Ro
L3
L1
PWM2
L2
1/5
1/5
1/5
IINFO1
IINFO2
IINFO3
IFB



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