参数资料
| 型号： | ISL6566ACRZ |
| 厂商： | Intersil |
| 文件页数： | 21/28页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 3PHASE BUCK 40-QFN |
| 标准包装： | 500 |
| 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： | * |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | * |
| 包装： | 管件 |
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ISL6566A
dissipation in the controller itself, P DR , can be roughly
estimated as:
temperature rise in order to cause proportionally less current
to flow in the hotter phase.
R ISEN , 2 = R ISEN ---------- 2
P DR = P DR_UP + P DR_LOW + P BOOT + ( I Q ? VCC )
(EQ. 23)
? T
? T 1
(EQ. 25)
P BOOT = ---------------------
P DR_UP = ? -------------------------------------- + ---------------------------------------- ? ? ---------------------
R HI1 + R EXT1
R LO1 + R EXT1 ?
?
P DR_LOW = ? -------------------------------------- + ---------------------------------------- ? ? ---------------------
R HI2 + R EXT2
R LO2 + R EXT2 ?
?
P Qg_Q1
3
? R HI1 R LO1 ? P Qg_Q1
3
? R HI2 R LO2 ? P Qg_Q2
2
In Equation 25, make sure that ? T 2 is the desired temperature
rise above the ambient temperature, and ? T 1 is the measured
temperature rise above the ambient temperature. While a
single adjustment according to Equation 25 is usually
sufficient, it may occasionally be necessary to adjust R ISEN
two or more times to achieve optimal thermal balance
between all channels.
Load Line Regulation Component Selection (DCR
R EXT1 = R G1 + -------------
R GI2
N Q2
R GI1
N Q1
R EXT2 = R G2 + -------------
Current Sensing)
For accurate load line regulation, the ISL6566A senses the
Current Balancing Component Selection
The ISL6566A senses the channel load current by sampling
the voltage across the lower MOSFET r DS(ON) , as shown in
Figure 17. The ISEN pins are denoted ISEN1, ISEN2, and
ISEN3. The resistors connected between these pins and the
respective phase nodes determine the gains in the channel-
current balance loop.
V IN
CHANNEL N
UPPER MOSFET
I L
ISEN(n)
R ISEN
total output current by detecting the voltage across the
output inductor DCR of each channel (As described in the
Load Line Regulation section). As Figure 18 illustrates, an
R-C network is required to accurately sense the inductor
DCR voltage and convert this information into a “droop”
voltage, which is proportional to the total output current.
Choosing the components for this current sense network is a
two step process. First, R COMP and C COMP must be
chosen so that the time constant of this R COMP -C COMP
network matches the time constant of the inductor L/DCR.
Then the resistor R S must be chosen to set the current
sense network gain, obtaining the desired full load droop
voltage. Follow the steps below to choose the component
values for this R-C network.
1. Choose an arbitrary value for C COMP . The recommended
value is 0.01 μ F.
2. Plug the inductor L and DCR component values, and the
ISL6566A
-
I L r DS ( ON )
values for C COMP chosen in steps 1, into Equation 26 to
calculate the value for R COMP .
R COMP = ---------------------------------------
+
CHANNEL N
LOWER MOSFET
L
DCR ? C COMP
(EQ. 26)
FIGURE 17. ISL6566A INTERNAL AND EXTERNAL CURRENT-
SENSING CIRCUITRY
Select values for these resistors based on the room
3. Use the new value for R COMP obtained from Equation
26, as well as the desired full load current, I FL , full load
droop voltage, V DROOP , and inductor DCR in Equation
27 to calculate the value for R S .
R S = ------------------------- ? R COMP ? DCR
R ISEN = ----------------------- ) --------
temperature r DS(ON) of the lower MOSFETs; the full-load
operating current, I FL ; and the number of phases, N using
Equation 24.
r DS ( ON I FL
(EQ. 24)
50 × 10 – 6 N
In certain circumstances, it may be necessary to adjust the
value of one or more ISEN resistors. When the components of
one or more channels are inhibited from effectively dissipating
their heat so that the affected channels run hotter than
desired, choose new, smaller values of R ISEN for the affected
phases (see the section entitled Channel-Current Balance ).
Choose R ISEN,2 in proportion to the desired decrease in
21
I FL
V DROOP
(EQ. 27)
FN9200.2
July 27, 2005
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| ISL6566ACRZ-T | 功能描述:IC CTRLR PWM 3PHASE BUCK 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 |
| ISL6566AIRZ | 功能描述:IC CTRLR PWM 3PHASE BUCK 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 |
| ISL6566AIRZ-T | 功能描述:IC CTRLR PWM 3PHASE BUCK 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 |
| ISL6566CR | 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) |
| ISL6566CRR5184 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
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