LTC3787
APPLICATIONS INFORMATION
Tying the PHASMD pin to INTV , SGND or floating
or 180°. Figure 4 shows the connections necessary for
3-, 4-, 6- or 12-phase operation. A total of 12 phases can
be cascaded to run simultaneously out-of-phase with
respect to each other.
CC
generates a phase difference (between PLLIN/MODE
and CLKOUT) of 240°, 60° or 90°, respectively, and a
phase difference (between CH1 and CH2) of 120°, 180°
0,240
120, CHANNEL 2 NOT USED
PLLIN/MODE CLKOUT
+120
V
PLLIN/MODE CLKOUT
OUT
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
RUN
ITH
RUN
ITH
VFB
VFB
INTV
CC
(4a) 3-Phase Operation
0,180
PLLIN/MODE CLKOUT
90,270
PLLIN/MODE CLKOUT
+90
V
OUT
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
RUN
ITH
RUN
ITH
VFB
VFB
(4b) 4-Phase Operation
0,180
PLLIN/MODE CLKOUT
60,240
120,300
+60
+60
V
OUT
PLLIN/MODE CLKOUT
PLLIN/MODE CLKOUT
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
RUN
ITH
RUN
ITH
RUN
ITH
VFB
VFB
VFB
(4c) 6-Phase Operation
0,180
PLLIN/MODE CLKOUT
60,240
+60
PLLIN/MODE CLKOUT
120,300
+60
+90
V
OUT
PLLIN/MODE CLKOUT
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
RUN
ITH
RUN
ITH
RUN
ITH
VFB
VFB
VFB
210,30
PLLIN/MODE CLKOUT
270,90
PLLIN/MODE CLKOUT
330,150
PLLIN/MODE CLKOUT
+60
+60
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
PHASMD
LTC3787
SS
RUN
ITH
RUN
ITH
RUN
ITH
VFB
VFB
VFB
3787 F04
(4d) ±2-Phase Operation
Figure 4. PolyPhase Operation
3787fc
20
Linear Systems [ Linear Systems ]
