参数资料
| 型号： | ISL6561CR-T |
| 厂商： | Intersil |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM MULTIPHASE 40-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，Intel VR10X |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 4 |
| 输出电压： | 0.84 V ~ 1.6 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 带卷 (TR) |
ISL6561
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.
FB
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
E/A
DYNAMIC
VID D/A
DAC
R REF
REF
VCC
or
GND
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
2.0V
-
+
0.5V
+
-
ISL6561CR
OFS
R OFS
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
VCC
GND
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.
FIGURE 8. OUTPUT VOLTAGE OFFSET PROGRAMMING
WITH ISL6561CR
C REF R RE F = 4 T VID
(EQ. 12)
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):
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
2 × R REF
R OFS = --------------------------
0.5 × R REF
R OFS = ------------------------------
V OFFSET
For Negative Offset (connect R OFS to GND):
V OFFSET
Dynamic VID
(EQ. 10)
(EQ. 11)
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.
α
R TCOMP = ----------------------
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
K T K TC
(EQ. 13)
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
16
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
FN9098.5
May 12, 2005
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相关代理商/技术参数 |
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|---|---|
| ISL6561CRZ | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6561CRZ | 制造商:Intersil Corporation 功能描述:Pulse Width Modulation (PWM) Controller |
| ISL6561CRZA | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6561CRZA-T | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6561CRZR5208 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
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