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ISL6327ACRZ Datasheet(PDF) 17 Page - Renesas Technology Corp

Part # ISL6327ACRZ
Description  Enhanced 6-Phase PWM Controller with 8-Bit VID Code and Differential Inductor DCR or Resistor Current Sensing
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL6327ACRZ Datasheet(HTML) 17 Page - Renesas Technology Corp

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ISL6327A
FN6833 Rev 0.00
Page 17 of 30
Feb 17, 2009
Figure 5 shows a current proportional to the average current
of all active channels, IAVG, flows from FB through a load-
line regulation resistor RFB. The resulting voltage drop
across RFB is proportional to the output current, effectively
creating an output voltage droop with a steady-state value
defined using Equation 8:
The regulated output voltage is reduced by the droop voltage
VDROOP. The output voltage as a function of load current is
derived by combining Equation 8 with the appropriate
sample current expression defined by the current sense
method employed in Equation 9.
Where VREF is the reference voltage, VOFS is the
programmed offset voltage, IOUT is the total output current
of the converter, RISEN is the sense resistor connected to
the ISEN+ pin, and RFB is the feedback resistor, N is the
active channel number, and RX is the DCR, or RSENSE
depending on the sensing method.
Therefore, the equivalent loadline impedance (i.e. Droop
impedance) is equal to Equation 10:
Output-Voltage Offset Programming
The ISL6327A allows the designer to accurately adjust the
offset voltage. When a resistor, ROFS, is connected between
OFS to VCC, the voltage across it is regulated to 1.6V. This
causes a proportional current (IOFS) to flow into OFS. If
ROFS is connected to ground, the voltage across it is
regulated to 0.4V, and IOFS flows out of OFS. A resistor
between DAC and REF, RREF, is selected so that the
product (IOFS x ROFS) is equal to the desired offset voltage.
These functions are shown in Figure 6.
Once the desired output offset voltage has been determined,
use Equation 11 to set ROFS:
For Positive Offset (connect ROFS to VCC):
For Negative Offset (connect ROFS to GND):
1
000111
0
0.72500
1
000111
1
0.71875
1
001000
0
0.71250
1
001000
1
0.70625
1
001001
0
0.70000
1
001001
1
0.69375
1
001010
0
0.68750
1
001010
1
0.68125
1
001011
0
0.67500
1
001011
1
0.66875
1
001100
0
0.66250
1
001100
1
0.65625
1
001101
0
0.65000
1
001101
1
0.64375
1
001110
0
0.63750
1
001110
1
0.63125
1
001111
0
0.62500
1
001111
1
0.61875
1
010000
0
0.61250
1
010000
1
0.60625
1
010001
0
0.60000
1
010001
1
0.59375
1
010010
0
0.58750
1
010010
1
0.58125
1
010011
0
0.57500
1
010011
1
0.56875
1
010100
0
0.56250
1
010100
1
0.55625
1
010101
0
0.55000
1
010101
1
0.54375
1
010110
0
0.53750
1
010110
1
0.53125
1
010111
0
0.52500
1
010111
1
0.51875
1
011000
0
0.51250
1
011000
1
0.50625
1
011001
0
0.50000
1
111111
0
OFF
1
111111
1
OFF
TABLE 3. VR11 VID 8-BIT (Continued)
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VOLTAGE
VDROOP
IAVG RFB
=
(EQ. 8)
VOUT
VREF VOFS
IOUT
N
-------------
RX
RISEN
------------------RFB



=
(EQ. 9)
RLL
RFB
N
------------
RX
RISEN
------------------
=
(EQ. 10)
ROFS
1.6 RREF
VOFFSET
------------------------------
=
(EQ. 11)
ROFS
0.4 RREF
VOFFSET
------------------------------
=
(EQ. 12)


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