参数资料
| 型号： | ISL6312CRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 28/35页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 48-QFN |
| 标准包装： | 1,000 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.6 V |
| 工作温度： | 0°C ~ 70°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： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页当前第28页第29页第30页第31页第32页第33页第34页第35页
ISL6312
Inductor DCR Current Sensing Component
Selection
The ISL6312 senses each individual channel’s inductor
2. Plug the inductor L and DCR component values, and the
value for C 1 chosen in step 1, into Equation 33 to
calculate the value for R 1 .
R 1 = -------------------------
current by detecting the voltage across the output inductor
DCR of that channel (as described in the “Continuous
L
DCR ? C 1
I OCP = I OCP , min
(EQ. 33)
R-C network is required to accurately sense the inductor
DCR voltage and convert this information into a current,
which is proportional to the total output current. The time
constant of this R-C network must match the time constant
of the inductor L/DCR.
3. Resistor R 2 should be left unpopulated.
If the desired overcurrent trip level, I OCP , is greater then the
minimum overcurrent trip level, I OCP,min , then a resistor
divider R-C circuit should be used to set the desired trip
level. Follow the steps below to choose the component
MOSFET
UGATE(n)
V IN
L
I
L
DCR
V OUT
values for the resistor divider R-C current sensing
network :
1. Choose an arbitrary value for C 1 . The recommended
value is 0.1 μ F.
DRIVER
LGATE(n)
INDUCTOR
V L (s)
V C (s)
R 1 C 1
C OUT
2. Plug the inductor L and DCR component values, the
value for C 1 chosen in step 1, the number of active
channels N, and the desired overcurrent protection level
I OCP into Equations 34 and 35 to calculate the values for
R 1 and R 2 .
L ? I OCP
C 1 ? 0.0375 ? N
ISL6312 INTERNAL CIRCUIT
R 2*
R 1 = ---------------------------------------
I OCP > I OCP , min
(EQ. 34)
L ? I OCP
C 1 ? ( I OCP ? DCR – 0.0375 ? N )
I n
R 2 = ----------------------------------------------------------------------------------
(EQ. 35)
SAMPLE
I SEN
+
-
V C (s)
R ISEN
ISEN-(n)
ISEN+(n)
*R 2 is OPTIONAL
Due to errors in the inductance or DCR it may be necessary
to adjust the value of R 1 and R 2 to match the time constants
correctly. The effects of time constant mismatch can be seen
in the form of droop overshoot or undershoot during the
initial load transient spike, as shown in Figure 19. Follow the
steps below to ensure the R-C and inductor L/DCR time
constants are matched accurately.
1. Capture a transient event with the oscilloscope set to
FIGURE 18. DCR SENSING CONFIGURATION
The R-C network across the inductor also sets the
overcurrent trip threshold for the regulator. Before the R-C
components can be selected, the desired overcurrent
protection level should be chosen. The minimum overcurrent
trip threshold the controller can support is dictated by the
DCR of the inductors and the number of active channels. To
about L/DCR/2 (sec/div). For example, with L = 1 μ H and
DCR = 1m Ω , set the oscilloscope to 500 μ s/div.
2. Record Δ V1 and Δ V2 as shown in Figure 19.
calculate the minimum overcurrent trip level, I OCP,min , use
Equation 32, where N is the number of active channels, and
Δ V 1
Δ V 2
I OCP , min = ---------------------------
DCR is the individual inductor ’s DCR.
0.0375 ? N
DCR
(EQ. 32)
V OUT
The overcurrent trip level of the ISL6312 cannot be set any
lower then the I OCP,min level calculated above. If the
minimum overcurrent trip level is desired, follow the
steps below to choose the component values for the
R-C current sensing network :
1. Choose an arbitrary value for C 1 . The recommended
value is 0.1μF.
28
I TRAN
Δ I
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
FN9289.6
February 1, 2011
相关PDF资料 |
PDF描述 |
|---|---|
| EMC25DREH-S734 | CONN EDGECARD 50POS .100 EYELET |
| ESC20DRYN-S13 | CONN EDGECARD 40POS .100 EXTEND |
| 450USC390MEFCSN30X45 | CAP ALUM 390UF 450V 20% SNAP-IN |
| 400USC470MEFCSN35X40 | CAP ALUM 470UF 400V 20% SNAP-IN |
| ESC20DRYH-S13 | CONN EDGECARD 40POS .100 EXTEND |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6312CRZ-TR5312 | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 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) |
| ISL6312CRZ-TR5338C | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL6312IRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 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) |
| ISL6312IRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 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) |
| ISL6313BCRZ | 功能描述:IC CTRLR PWM BUCK 2PHASE 36-TQFN 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 |
发布紧急采购，3分钟左右您将得到回复。