参数资料
| 型号： | ISL6566CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 15/29页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM BUCK 3PHASE 40-QFN |
| 标准包装： | 1 |
| 应用： | 控制器，Intel VRM9，VRM10，AMD Hammer 应用 |
| 输入电压： | 3 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.8 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： | 标准包装 |
| 其它名称： | ISL6566CRZ-TDKR |
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ISL6566
As shown in Figure 6, a voltage, V DROOP , proportional to the
total current in all active channels, I OUT , feeds into the
differential remote-sense amplifier. The resulting voltage at
the output of the remote-sense amplifier is the sum of the
output voltage and the droop voltage. As Equation 4 shows,
feeding this voltage into the compensation network causes
the regulator to adjust the output voltage so that it’s equal to
the reference voltage minus the droop voltage.
PHASE1
PHASE2
R S
I
V L (s)
L
DCR
INDUCTOR
L 1
L
DCR
INDUCTOR
I OUT
V OUT
C OUT
The droop voltage, V DROOP , is created by sensing the
current through the output inductors. This is accomplished
by using a continuous DCR current sensing method.
PHASE3
R S
I
L 2
L
DCR
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 7. The channel current,
ISUM
R S
I
INDUCTOR
L 3
I L , flowing through the inductor, passes through the DCR.
Equation 5 shows the s-domain equivalent voltage, V L ,
across the inductor.
ICOMP
C COMP
R COMP
V L ( s ) = I L ? ( s ? L + DCR )
(EQ. 5)
-
V DROOP
+
IREF
(optional)
The inductor DCR is important because the voltage dropped
(EQ. 6)
? ------------- + 1 ?
? DCR
COMP
V ( s ) = -------------------------------------------------------------------------- ? ----------------------- ? ( I + I + I ) ? DCR
COMP
COMP
S
across it is proportional to the channel current. By using a
simple R-C network and a current sense amplifier, as shown
in Figure 7, the voltage drop across all of the inductors DCRs
can be extracted. The output of the current sense amplifier,
V DROOP , can be shown to be proportional to the channel
currents I L1 , I L2 , and I L3 , shown in Equation 6.
s ? L
? R
DROOP ( s ? R ? C + 1 ) R L1 L2 L3
If the R-C network components are selected such that the
R-C time constant matches the inductor L/DCR time
constant, then V DROOP is equal to the sum of the voltage
drops across the individual DCRs, multiplied by a gain. As
Equation 7 shows, V DROOP is therefore proportional to the
total output current, I OUT .
ISL6566
FIGURE 7. DCR SENSING CONFIGURATION
By simply adjusting the value of R S , the load line can be set
to any level, giving the converter the right amount of droop at
all load currents. It may also be necessary to compensate for
any changes in DCR due to temperature. These changes
cause the load line to be skewed, and cause the R-C time
constant to not match the L/DCR time constant. If this
becomes a problem a simple negative temperature
coefficient resistor network can be used in the place of
R COMP to compensate for the rise in DCR due to
temperature.
Note: An optional 10nF ceramic capacitor from the ISUM
pin to the IREF pin is recommended to help reduce any
noise affects on the current sense amplifier due to layout.
V DROOP = --------------------- ? I OUT ? DCR
R COMP
R S
15
(EQ. 7)
Output-Voltage Offset Programming
The ISL6566 allows the designer to accurately adjust the
offset voltage by connecting a resistor, R OFS , from the OFS
pin to VCC or GND. When R OFS is connected between OFS
and VCC, the voltage across it is regulated to 1.5V. This
causes a proportional current (I OFS ) to flow into the OFS pin
and out of the FB pin. If R OFS is connected to ground, the
voltage across it is regulated to 0.5V, and I OFS flows into the
FB pin and out of the OFS pin. The offset current flowing
through the resistor between VDIFF and FB will generate the
desired offset voltage which is equal to the product (I OFS x
R FB ). These functions are shown in Figures 8 and 9.
FN9178.4
March 9, 2006
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| ISL6566EVAL1 | 功能描述:EVAL BOARD 1 FOR ISL6566 RoHS:否 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6566IR | 功能描述:IC CTRLR PWM BUCK 3PHASE 40-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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