ISL6566 Datasheet, PDF (27/28 Pages) Intersil Corporation – Three-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications

ISL6566
+5V
(CF1)
R_OFS
R_FB
VDIFF
VSEN
RGND
LOCATE CLOSE TO IC
C₂
(MINIMIZE CONNECTION PATH)
KEY
HEAVY TRACE ON CIRCUIT PLANE LAYER
C₁
FB
R₁
COMP
PVCC1
+12V
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT PLANE LAYER
VIA CONNECTION TO GROUND PLANE
(CF2)
C_BIN1
BOOT1
UGATE1
C_BOOT1
LOCATE NEAR SWITCHING TRANSISTORS;
(MINIMIZE CONNECTION PATH)
VCC
PHASE1
ISEN1
LGATE1
R_ISEN1
OFS
FS
R_T
REF
C_REF
+12V
VID4
VID3
VID2
VID1
VID0
VID12.5
VRM10
PGOOD
GND
+12V
PVCC2
ISL6566
BOOT2
UGATE2
C_BOOT2
PHASE2
ISEN2
LGATE2
R_ISEN2
(CF2)
C_BIN2
PVCC3
BOOT3
C_BOOT3
UGATE3
+12V
C_BIN3
(CF2)
C_BOUT (C_HFOUT)
LOAD
LOCATE NEAR LOAD;
(MINIMIZE CONNECTION PATH)
ENLL
IREF
OCSET
ICOMP
ISUM
R_COMP
R_OCSET
C_COMP
PHASE3
ISEN3
LGATE3
R_ISEN3
R_S
R_S
R_S
FIGURE 25. PRINTED CIRCUIT BOARD POWER PLANES AND ISLANDS
27
FN9178.3
July 25, 2005