参数资料
| 型号： | ISL6265AHRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR MULTI-OUTPUT 48-TQFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，AMD SVI 兼容移动式 CPU |
| 输入电压： | 5 V ~ 24 V |
| 输出数： | 3 |
| 输出电压： | 0.5 V ~ 1.55 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
ISL6265A
It is recommended that whenever the control loop
Where:
R 2
compensation network is modified, the switching frequency
should be checked and adjusted by changing R FSET_NB if
K = ---------------------
R 2 + R 1
(EQ. 8)
------------- = -------------------- 2 - ? C 1
R 1 + R 2
DCR
necessary.
Current Sense
Core and Northbridge regulators feature two different types
of current sense circuits.
CORE CONTINUOUS CURRENT SENSE
The ISL6265A provides for load current to be measured
using either resistors in series with the individual output
inductors or using the intrinsic series resistance of the
inductors as shown in the applications circuits in Figures 2
and 3. The load current in a particular output is sampled
continuously every switching cycle. During this time, the
current-sense amplifier uses the current sense inputs to
reproduce a signal proportional to the inductor current. This
sensed current is a scaled version of the inductor current.
Sensing the time varying inductor current accurately
requires that the parallel R-C network time constant match
the inductor L/DCR time constant. If the R-C network
components are selected, such that the R-C time constant
matches the inductor L/DCR time constant (see Equation 9),
then V C is equal to the voltage drop across the DCR
multiplied by the ratio of the resistor divider, K.
L R 1 ? R
(EQ. 9)
The inductor current sense information is used for current
balance in dual plane applications, overcurrent detection in
core outputs and output voltage droop depending on
controller configuration.
CORE DCR TEMPERATURE COMPENSATION
MOSFET
UGATE
V IN
L
IL
DCR
V OUT
It may also be necessary to compensate for changes in
inductor DCR due to temperature. DCR shifts due to
temperature cause time constant mismatch, skewing inductor
current accuracy. Potential problems include output voltage
DRIVER
LGATE
INDUCTOR
V L (s)
C OUT
droop and OC trip point, both shifting significantly from
expected levels. The addition of a negative temperature
V C (s)
coefficient (NTC) resistor to the R-C network compensates for
the rise in DCR due to temperature. Typical NTC values are in
ISL6265A INTERNAL CIRCUIT
R 1
C 1
R 2
the 10k Ω range. A second resistor, R 3 , in series with the NTC
allows for more accurate time-constant and resistor-ratio
matching as the pair of resistors are placed in parallel with R 2
CURRENT
SENSE
ISP
ISN
R NTC
R 3
OPTIONAL
NTC
NETWORK
(Figure 9). The NTC resistor must be placed next to the
inductor for good heat transfer, while R 1 , R 2 , R 3 , and C 1 are
placed close to the controller for interference immunity.
CORE DCR COMPONENT SELECTION FOR DROOP
By adjusting the ratio between inductor DCR drop and the
voltage measured across the sense capacitor, the load line
FIGURE 9. DCR SENSING COMPONENTS
can be set to any level, giving the converter the correct
amount of droop at all load currents.
Inductor windings have a characteristic distributed
I MAX
V DROOP = -------------- ? 5 ? V C , OC
resistance or DCR (Direct Current Resistance). For
simplicity, the inductor DCR is considered as a separate
lumped quantity, as shown in Figure 9. The inductor current,
I L , flowing through the inductor, passes through the DCR.
Equation 6 shows the s-domain equivalent voltage, V L ,
across the inductor.
Equation 10 shows the relation between droop voltage,
(EQ. 10)
I OC
maximum output current (I MAX ), OC trip level and current
sense capacitor voltage at the OC current level, V C(OC) .
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 6)
AMD specifications do not require droop and provide no load
line guidelines. Tight static output voltage tolerance limits
? ------------- + 1 ?
? DCR
?
V C ( s ) = ----------------------------------------------------------- ? K ? DCR ? I L
? s ? ------------------------ ? C 1 + 1 ?
A simple R-C network across the inductor (R 1 , R 2 and C)
extracts the DCR voltage, as shown in Equation 7. The
voltage across the sense capacitor, V C , can be shown to be
proportional to the output current I L , shown in Equation 7.
s ? L
(EQ. 7)
? ( R 1 ? R 2 ) ?
? R 1 + R 2 ?
16
push acceptable level of droop below a useful level for Griffin
applications. Care must be taken in applications which
implement droop to balance time constant mismatch, sense
capacitor resistor ratio, OC trip and droop equations.
Temperature shifts related to DCR must also be addressed,
as outlined in the previous section.
FN6884.0
May 11, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6265C | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multi-Output Controller with Integrated MOSFET Drivers for AMD SVI Capable Mobile CPUs |
| ISL6265C_10 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multi-Output Controller with Integrated MOSFET Drivers for AMD SVI Capable Mobile CPUs |
| ISL6265CEVAL1Z | 制造商:Intersil Corporation 功能描述:ISL6265 EVALUATION BOARD 1 - 48 LD TQFN - ROHS COMPLIANT - Bulk |
| ISL6265CHRTZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLRS PHS W/EMBEDDED GATE RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6265CHRTZ-T | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLRS PHS W/EMBEDDED GATE RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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