參數(shù)資料
型號： ISL6561IR
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application
中文描述： SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 6 X 6 MM, PLASTIC, MO-220VJJD-2, MLFP, QFN-40
文件頁數(shù)： 15/26頁
文件大小： 782K
代理商： ISL6561IR
15
FN9098.5
May 12, 2005
In other cases, the designer may determine that a more
cost-effective solution can be achieved by adding droop.
Droop can help to control the output-voltage spike that
results from fast load-current demand changes.
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.
As shown in Figure 8, a current proportional to the average
current in all active channels, I
AVG
, flows from FB through a
load-line regulation resistor, R
FB
. The resulting voltage drop
across R
FB
is proportional to the output current, effectively
creating an output voltage droop with a steady-state value
defined as
The regulated output voltage is reduced by the droop voltage
V
DROOP
. The output voltage as a function of load current is
derived by combining Equations 8 with the appropriate
sample current expression defined by the current sense
method employed.
Where V
REF
is the reference voltage, V
OFS
is the
programmed offset voltage, V
OUT
is the total output current
of the converter, R
ISEN
is the sense resistor in the ISEN line,
and R
FB
is the feedback resistor. R
X
has a value of DCR,
r
DS(ON)
, or R
SENSE
depending on the sensing method.
Output-Voltage Offset Programming
The ISL6561 allows the designer to accurately adjust the
offset voltage. When a resistor, R
OFS
, is connected between
OFS and VCC, the voltage across it is regulated to 2.0V. This
causes a proportional current (I
OFS
) to flow into OFS. If
R
OFS
is connected to ground, the voltage across it is
regulated to 0.5V, and I
OFS
flows out of OFS. A resistor
0
0
0
0
1
0
1.0625V
0
0
0
0
0
1
1.0750V
0
0
0
0
0
0
1.0875V
1
1
1
1
1
1
OFF
1
1
1
1
1
0
OFF
1
1
1
1
0
1
1.1000V
1
1
1
1
0
0
1.1125V
1
1
1
0
1
1
1.1250V
1
1
1
0
1
0
1.1375V
1
1
1
0
0
1
1.1500V
1
1
1
0
0
0
1.1625V
1
1
0
1
1
1
1.1750V
1
1
0
1
1
0
1.1875V
1
1
0
1
0
1
1.2000V
1
1
0
1
0
0
1.2125V
1
1
0
0
1
1
1.2250V
1
1
0
0
1
0
1.2475V
1
1
0
0
0
1
1.2500V
1
1
0
0
0
0
1.2625V
1
0
1
1
1
1
1.2750V
1
0
1
1
1
0
1.2875V
1
0
1
1
0
1
1.3000V
1
0
1
1
0
0
1.3125V
1
0
1
0
1
1
1.3250V
1
0
1
0
1
0
1.3375V
1
0
1
0
0
1
1.3500V
1
0
1
0
0
0
1.3625V
1
0
0
1
1
1
1.3750V
1
0
0
1
1
0
1.3875V
1
0
0
1
0
1
1.4000V
1
0
0
1
0
0
1.4125V
1
0
0
0
1
1
1.4250V
1
0
0
0
1
0
1.4375V
1
0
0
0
0
1
1.4500V
1
0
0
0
0
0
1.4625V
0
1
1
1
1
1
1.4750V
0
1
1
1
1
0
1.4875V
0
1
1
1
0
1
1.5000V
0
1
1
1
0
0
1.5125V
0
1
1
0
1
1
1.5250V
TABLE 1. VOLTAGE IDENTIFICATION (VID) CODES (Continued)
VID4
VID3
VID2
VID1
VID0
VID12.5
VDAC
0
1
1
0
1
0
1.5375V
0
1
1
0
0
1
1.5500V
0
1
1
0
0
0
1.5625V
0
1
0
1
1
1
1.5750V
0
1
0
1
1
0
1.5875V
0
1
0
1
0
1
1.600V
TABLE 1. VOLTAGE IDENTIFICATION (VID) CODES (Continued)
VID4
VID3
VID2
VID1
VID0
VID12.5
VDAC
V
DROOP
I
AVG
R
FB
=
(EQ. 8)
V
OUT
V
REF
V
OFFSET
–
I
-------------
R
ISEN
R
FB
–
=
(EQ. 9)
ISL6561
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