isl6334d Intersil Corporation, isl6334d Datasheet - Page 16

• Manufacturer Part Number: isl6334d
• Description: Vr11.1, 4-phase Pwm Controller With Phase Dropping, Droop Disabled And Load Current Monitoring Features
• Manufacturer: Intersil Corporation

Output-Voltage Offset Programming
The ISL6334D allows the designer to accurately adjust the
offset voltage. When a resistor, R
OFS to VCC, the voltage across it is regulated to 1.6V. This
causes a proportional current (I
R
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE
OFS
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
is connected to ground, the voltage across it is
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
TABLE 2. VR11 VID 8-BIT (Continued)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
1
1
16
OFS
OFS
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
1
1
) to flow into OFS. If
, is connected between
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
0.70000
0.69375
0.68750
0.68125
0.67500
0.66875
0.66250
0.65625
0.65000
0.64375
0.63750
0.63125
0.62500
0.61875
0.61250
0.60625
0.60000
0.59375
0.58750
0.58125
0.57500
0.56875
0.56250
0.55625
0.55000
0.54375
0.53750
0.53125
0.52500
0.51875
0.51250
0.50625
0.50000
OFF
OFF
ISL6334D
regulated to 0.4V, and I
between DAC and REF, R
product (I
These functions are shown in Figure 7.
Once the desired output offset voltage has been determined,
use Equations 8 and 9 to calculate R
For Positive Offset (connect R
For Negative Offset (connect R
Dynamic VID
Modern microprocessors need to make changes to their
core voltage as part of normal operation. They direct the
core-voltage regulator to do this by making changes to the
VID inputs during regulator operation. The power
management solution is required to monitor the DAC inputs
and respond to on-the-fly VID changes in a controlled
manner. Supervising the safe output voltage transition within
the DAC range of the processor without discontinuity or
disruption is a necessary function of the core-voltage
regulator.
In order to ensure the smooth transition of output voltage
during VID change, a VID step change smoothing network,
composed of R
used. The selection of R
voltage, as detailed in “Output-Voltage Offset Programming”
R
R
OFS
OFS
FIGURE 7. OUTPUT VOLTAGE OFFSET PROGRAMMING
=
=
1.6
----------------------------- -
0.4
----------------------------- -
OFS
V
V
1.6V
OFFSET
OFFSET
×
×
VCC
R
R
x R
+
-
REF
REF
REF
OFS
0.4V
and C
E/A
) is equal to the desired offset voltage.
OFS
GND
+
-
REF
REF
REF
FB
flows out of OFS. A resistor
is based on the desired offset
, as shown in Figure 7, can be
, is selected so that the
OFS
OFS
to VCC):
DYNAMIC
to GND):
VID D/A
OFS
ISL6334D
:
October 29, 2008
DAC
OFS
GND
VCC
OR
(EQ. 8)
(EQ. 9)
FN6802.0
REF
R
R
C
REF
REF
OFS