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ISL6310 Datasheet(PDF) 13 Page - Intersil Corporation

Part No. ISL6310
Description  Two-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ISL6310 Datasheet(HTML) 13 Page - Intersil Corporation

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13
FN9209.3
December 12, 2006
If the R-C network components are selected such that the
R-C time constant matches the inductor L/DCR time
constant, then VDROOP is equal to the sum of the voltage
drops across the individual DCRs, multiplied by a gain. As
Equation 8 shows, VDROOP is therefore proportional to the
total output current, IOUT.
By simply adjusting the value of RS, the load line can be set
to any level, giving the converter the right amount of droop at
all load currents. It may also be necessary to compensate for
any changes in DCR due to temperature. These changes
cause the load line to be skewed, and cause the R-C time
constant to not match the L/DCR time constant. If this
becomes a problem a simple negative temperature
coefficient resistor network can be used in the place of
RCOMP to compensate for the rise in DCR due to
temperature.
Output Voltage Offset Programming
The ISL6310 allows the designer to accurately adjust the
offset voltage by connecting a resistor, ROFS, from the OFS
pin to VCC or GND. When ROFS is connected between OFS
and VCC, the voltage across it is regulated to 1.5V. This
causes a proportional current (IOFS) to flow into the OFS pin
and out of the FB pin. If ROFS is connected to ground, the
voltage across it is regulated to 0.5V, and IOFS flows into the
FB pin and out of the OFS pin. The offset current flowing
through the resistor between VDIFF and FB will generate the
desired offset voltage which is equal to the product (IOFS x
R1). These functions are shown in Figures 8 and 9.
Once the desired output offset voltage has been determined,
use the following formulas to set ROFS:
For Positive Offset (connect ROFS to GND):
For Negative Offset (connect ROFS to VCC):
V
DROOP
R
COMP
R
S
--------------------- I
OUT DC R
⋅⋅
=
(EQ. 8)
FIGURE 7. DCR SENSING CONFIGURATION
ICOMP
DCR
L
INDUCTOR
VOUT
COUT
I
L1
VL(s)
DCR
L
INDUCTOR
PHASE1
PHASE2
I
L2
RS
RS
RCOMP
CCOMP
ISUM
IREF
ISL6310
-
+
VDROOP
IOUT
DROOP
CSUM
(Optional)
(EQ. 9)
R
OFS
0.5 R
1
V
OFFSET
--------------------------
=
(EQ. 10)
R
OFS
1.5 R
1
V
OFFSET
--------------------------
=
E/A
FB
OFS
VCC
GND
+
-
+
-
0.5V
1.5V
GND
ROFS
R1
VDIFF
ISL6310
FIGURE 8. POSITIVE OFFSET OUTPUT VOLTAGE
PROGRAMMING
VREF
VOFS
+
-
IOFS
E/A
FB
OFS
VCC
GND
+
-
+
-
0.5V
1.5V
VCC
ROFS
R1
VDIFF
ISL6310
VREF
VOFS
+
-
IOFS
FIGURE 9. NEGATIVE OFFSET OUTPUT VOLTAGE
PROGRAMMING
ISL6310


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