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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)： | 16/26頁 |
| 文件大?。?/td> | 782K |
| 代理商： | ISL6561IR |
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16
FN9098.5
May 12, 2005
between DAC and REF, R
REF
, is selected so that the product
(I
OFS
x R
REF
) is equal to the desired offset voltage. These
functions are shown in Figures 8.
As evident in Figure 8, the OFSOUT pin must be connected
to the REF pin for this current injection to function in
ISL6561CR. The current flowing through R
REF
creates an
offset at the REF pin, which is ultimately duplicated at the
output of the regulator.
Once the desired output offset voltage has been determined,
use the following formulas to set R
OFS
:
For Positive Offset (connect R
OFS
to VCC):
For Negative Offset (connect R
OFS
to GND):
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.
The ISL6561 checks the VID inputs six times every switching
cycle. If the VID code is found to have has changed, the
controller waits half of a complete cycle before executing a
12.5mV change. If during the half-cycle wait period, the
difference between DAC level and the new VID code
changes, no change is made. If the VID code is more than 1
bit higher or lower than the DAC (not recommended), the
controller will execute 12.5mV changes six times per cycle
until VID and DAC are equal. It is for this reason that it is
important to carefully control the rate of VID stepping in 1-bit
increments.
In order to ensure the smooth transition of output voltage
during VID change, a VID step change smoothing network
composed of
R
REF
and C
REF
is required for an ISL6561
based voltage regulator. The selection of
R
REF
is based on
the desired offset as detailed above in
Output-Voltage Offset
Programming
. The selection of C
REF
is based on the time
duration for 1 bit VID change and the allowable delay time.
Assuming the microprocessor controls the VID change at 1
bit every T
VID
, the relationship between the time constant of
R
REF
and C
REF
network and T
VID
is given by Equation 12.
Typically R
REF
is selected to be 1k
, so with a VID step
change rate of 5
μ
s per bit, the value of C
REF
is 22nF based
on Equation 12.
Temperature Compensation
Both the MOSFET r
DS(ON)
and inductor DCR of inductor
vary in proportion to varying temperature. This means that a
circuit using r
DS(ON)
or DCR to sense channel current is
subject to a corresponding error in current measurement. In
order to compensate for this temperature-related error, a
temperature compensation circuit is provided within
ISL6561. This circuit senses the internal IC temperature and,
based on a resistor-selectable scaling factor, adjust the
droop current ouput to the IDROOP pin. When the TCOMP
resistor is properly selected, the droop current can
accurately represent the load current to achieve a linear,
temperature-independant load line.
The value of the Tcomp resistor can be determined using
Equation 13.
T
TC
In Equation 13, K
T
is the temperature coupling coefficient
between the ISL6561 and the lower MOSFET or output
inductor. It represents how closely the controller temperature
DYNAMIC
VID D/A
E/A
VCC
or
GND
DAC
FB
REF
OFS
VCC
GND
+
-
+
-
0.5V
2.0V
R
OFS
R
REF
ISL6561CR
FIGURE 8. OUTPUT VOLTAGE OFFSET PROGRAMMING
WITH ISL6561CR
R
OFS
2
OFFSET
R
×
--------------------------
=
(EQ. 10)
R
OFS
0.5
OFFSET
R
×
-----------------------------
=
(EQ. 11)
C
REF
R
RE
F
4 T
VID
=
(EQ. 12)
(EQ. 13)
R
TCOMP
---------------------
=
ISL6561
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| ISL6561IRZ | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6561IRZ-T | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6562 WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6562CB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ISL6562CB-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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