NCP81246
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15
GENERAL
Configuration
The NCP81246 is a three-rail IMVP8 controller, with
three internal drivers. The NCP81246 is configured with the
two-phase, dual-edge controller providing V_Rail2.
Table 8 shows the available configurations, and the
pull-down resistor required on Pin 40 (PWM/
ADDR_VBOOT) to configure them.
Table 8. CONFIGURATIONS
R
(kW)
2ph Ph1 Ph2 1ph A 1ph B
Addr
V
BOOT
(V)
D
RV1
D
RV2
PWM T
SENSE
Addr
V
BOOT
(V)
D
RV3
T
SENSE
Addr
V
BOOT
(V)
D
RV2
PWM T
SENSE
10 1 0 x x 2ph 0 0 x 1a 2 1 x N/A
(P
SYS
))
16.2 1 1.2 x x 2ph 0 1.2 x 1a 2 1 x N/A
(P
SYS
)
22.1 1 0 x x 2ph 0 0 x 1a 2 1.05 x N/A
(P
SYS
)
28.7 1 0 x x 2ph 0 0 x 1a 2 0.95 x N/A
(P
SYS
)
35.7 1 0 x x 2ph 0 0 x 1a 2 1 x N/A
(P
SYS
)
43.2 1 1.2 x x 2ph 0 1.2 x 1a 2 1 x N/A
(P
SYS
)
51.1 1 0 x x 2ph 0 0 x 1a 2 1.05 x N/A
(P
SYS
)
61.9 1 0 x x 2ph 0 0 x 1a 2 0.95 x N/A
(P
SYS
)
71.5 1 0 x x 2ph 2 1 x N/A
(P
SYS
)
0 0 x 1a
82.5 1 1.2 x x 2ph 2 1 x N/A
(P
SYS
)
0 1.2 x 1a
95.3 1 0 x x 2ph 2 1.05 x N/A
(P
SYS
)
0 0 x 1a
110 1 0 x x 2ph 2 0.95 x N/A
(P
SYS
)
0 0 x 1a
127 1 0 x x 2ph 3 0 x 1a 0 0 x 1b
143 1 1.2 x x 2ph 3 1.2 x 1a 0 1.2 x 1b
165 1 0 x x 2ph 3 0 x 1a 0 0 x 1b
187 1 0 x x 2ph 3 0 x 1a 0 0 x 1b
Switching Frequency Fsw
F
SW
is programmed on start-up with a pull-down on the
LG1 pin.
Table 9. SWITCHING FREQUENCY
Resistor Rail1/Rail2 Rail3
6.81 kW
750 kHz 750 kHz
14 kW
600 kHz 600 kHz
21.5 kW
450 kHz 600 kHz
28.7 kW
300 kHz 450 kHz
Serial VID Interface (Intel proprietary interface)
For Intel proprietary interface communication details please contact Intel
, Inc.
