ISL6327 Intersil Corporation, ISL6327 Datasheet - Page 14

• Manufacturer Part Number: ISL6327
• Description: Enhanced 6-Phase PWM Controller
• Manufacturer: Intersil Corporation

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Load-Line Regulation
Some microprocessor manufacturers require a precisely-
controlled output resistance. This dependence of the output
voltage on the load current is often termed “droop” or “load
line” regulation. By adding a well controlled output
impedance, the output voltage can effectively be level shifted
in a direction which works to achieve the load-line regulation
required by these manufacturers.
In other cases, the designer may determine that a more
cost-effective solution can be achieved by adding droop.
Droop can help to reduce the output-voltage spike that
results from the fast changes of the load-current demand.
The magnitude of the spike is dictated by the ESR and ESL
of the output capacitors selected. By positioning the no-load
voltage level near the upper specification limit, a larger
negative spike can be sustained without crossing the lower
limit. By adding a well controlled output impedance, the
output voltage under load can effectively be level shifted
down so that a larger positive spike can be sustained without
crossing the upper specification limit.
400mV
VID4
FIGURE 5. OUTPUT VOLTAGE AND LOAD-LINE
0
0
0
0
0
R
FB
TABLE 2. VR10 VID TABLE (WITH 6.25mV EXTENSION)
EXTERNAL CIRCUIT
V
V
200mV
OUT
OUT
+
VID3
-
V
1
1
1
1
1
DROOP
C
R
REF
-
+
C
REGULATION WITH OFFSET ADJUSTMENT
R
100mV
C
REF
VID2
C
0
0
0
0
0
IDROOP
COMP
VDIFF
RGND
VSEN
DAC
REF
FB
50mV
VID1
1
1
1
1
1
14
ISL6327 INTERNAL CIRCUIT
I
25mV
AVG
VID0
0
0
1
1
1
12.5mV
DIFFERENTIAL
REMOTE-SENSE
AMPLIFIER
VID5
ERROR AMPLIFIER
+
-
1
1
0
0
1
+
-
6.25mV
VID6
1
0
1
0
1
V
COMP
VOLTAGE
1.59375
1.58125
1.5875
1.575
1.6
(V)
ISL6327
400mV
TABLE 2. VR10 VID TABLE (WITH 6.25mV EXTENSION)
VID4
0
0
0
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
200mV
VID3
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
0
0
0
0
0
0
100mV
VID2
0
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
1
50mV
VID1
1
0
0
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
0
0
0
25mV
VID0
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
0
1
1
1
1
0
0
0
0
1
1
12.5mV
VID5
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
0
0
1
1
0
0
6.25mV
VID6
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
1
0
1
0
1
0
(Continued)
June 5, 2006
VOLTAGE
1.56875
1.55625
1.54375
1.53125
1.51875
1.50625
1.49375
1.48125
1.46875
1.45625
1.44375
1.43125
1.41875
1.40625
1.39375
1.38125
1.36875
1.35625
1.34375
1.33125
1.5625
1.5375
1.5125
1.4875
1.4625
1.4375
1.4125
1.3875
1.3625
1.3375
FN9276.1
1.525
1.475
1.425
1.375
1.55
1.45
1.35
1.5
1.4
(V)