参数资料
| 型号： | ISL6265HRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC CTLR 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) |
ISL6265
Estimating the value of R FSET_NB is written as shown in
Equation 5:
A simple R-C network across the inductor (R 1 , R 2 and C)
extracts the DCR voltage, as shown in Equation 7. The
R FSET = ---------------------
1
K ? F SW
(EQ. 5)
voltage across the sense capacitor, V C , can be shown to be
proportional to the output current I L , shown in Equation 7.
? ------------- + 1 ?
V C ( s ) = ----------------------------------------------------------- ? K ? DCR ? I L
? s ? ------------------------ ? C 1 + 1 ?
R 2
Where F SW is the PWM switching frequency, R FSET_NB is
the programming resistor and K = 1.5 x 10 -10 .
It is recommended that whenever the control loop
compensation network is modified, the switching frequency
should be checked and adjusted by changing R FSET_NB if
necessary.
Current Sense
s ? L
? DCR ?
? ( R 1 ? R 2 ) ?
? R 1 + R 2 ?
Where
K = ---------------------
R 2 + R 1
(EQ. 7)
(EQ. 8)
------------- = -------------------- 2 - ? C 1
R 1 + R 2
DCR
Core and Northbridge regulators feature two different types
of current sense circuits.
CORE CONTINUOUS CURRENT SENSE
The ISL6265 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
UGATE
V IN
IL
controller configuration.
CORE DCR TEMPERATURE COMPENSATION
MOSFET
L
DCR
V OUT
It may also be necessary to compensate for changes in
DRIVER
LGATE
INDUCTOR
V L (s)
C OUT
inductor DCR due to temperature. DCR shifts due to
temperature cause time constant mismatch, skewing
V C (s)
inductor current accuracy. Potential problems include output
voltage droop and OC trip point, both shifting significantly
ISL6265 INTERNAL CIRCUIT
R 1
C 1
R 2
from expected levels. The addition of a negative temperature
coefficient (NTC) resistor to the R-C network compensates
for the rise in DCR due to temperature. Typical NTC values
R NTC
OPTIONAL
are in the 10k Ω range. A second resistor, R 3 , in series with
the NTC allows for more accurate time-constant and
CURRENT
SENSE
ISP
ISN
R 3
NTC
NETWORK
resistor-ratio matching as the pair of resistors are placed in
parallel with R 2 (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.
I MAX
V DROOP = -------------- ? 5 ? V C , OC
FIGURE 9. DCR SENSING COMPONENTS
Inductor windings have a characteristic distributed
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.
V L ( s ) = I L ? ( s ? L + DCR ) (EQ. 6)
16
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
can be set to any level, giving the converter the correct
amount of droop at all load currents.
Equation 10 shows the relation between droop voltage,
maximum output current (I MAX ), OC trip level and current
sense capacitor voltage at the OC current level, V C(OC) .
(EQ. 10)
I OC
FN6599.1
May 13, 2009
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