参数资料
| 型号： | ISL6312AIRZ |
| 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： | 43 |
| 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： | -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 |
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ISL6312A
I OCP ≤ I OCP , min
R 1 = -------------------------
Inductor DCR Current Sensing Component
Selection
The ISL6312A senses each individual channel’s inductor
current by detecting the voltage across the output inductor
DCR of that channel (As described in the “Continuous Current
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 (EQ. 34)
DCR ? C 1
3. Resistor R 2 should be left unpopulated.
If the desired overcurrent trip level 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
values for the resistor divider R-C current sensing
network :
L
I OCP > I OCP , min
C 1 ? 0.0375 ? N
L/DCR.
MOSFET
DRIVER
UGATE(n)
LGATE(n)
V IN
I
L
DCR
INDUCTOR
V L (s)
V C (s)
V OUT
C OUT
1. Choose an arbitrary value for C 1 . The recommended
value is 0.1μF.
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 35 and 36 to calculate the values for
R 1 and R 2 .
L ? I OCP (EQ. 35)
R 1 = ---------------------------------------
C 1 ? ( I OCP ? DCR – 0.0375 ? N )
ISL6312A INTERNAL CIRCUIT
R 1
C 1
R 2*
L ? I OCP
R 2 = ----------------------------------------------------------------------------------
(EQ. 36)
Due to errors in the inductance or DCR it may be necessary
I n
SAMPLE
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
+
-
V C (s)
ISEN-(n)
steps below to ensure the R-C and inductor L/DCR time
constants are matched accurately.
I SEN
R ISEN
ISEN+(n)
*R 2 is OPTIONAL
1. Capture a transient event with the oscilloscope set to
about L/DCR/2 (sec/div). For example, with L = 1μH and
DCR = 1m Ω , set the oscilloscope to 500 μ s/div.
2. Record Δ V1 and Δ V2 as shown in Figure 19.
R 1 , NEW = R 1 , OLD ? ----------
Δ V
R 2 , NEW = R 2 , OLD ? ----------
Δ V
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
calculate the minimum overcurrent trip level, I OCP,min , use
Equation 33, where N is the number of active channels, and
DCR is the individual inductor ’s DCR.
3. Select new values, R 1,NEW and R 2,NEW , for the time
constant resistors based on the original values, R 1,OLD
and R 2,OLD , using Equations 37 and 38.
Δ V 1 (EQ. 37)
2
Δ V 1 (EQ. 38)
2
4. Replace R 1 and R 2 with the new values and check to see
that the error is corrected. Repeat the procedure if
I OCP , min = ---------------------------
0.0375 ? N
DCR
(EQ. 33)
necessary.
If the desired overcurrent trip level is equal to or less
then the minimum overcurrent trip level, 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.
2. Plug the inductor L and DCR component values, and the
value for C 1 chosen in step 1, into Equation 34 to
calculate the value for R 1
28
FN9290.5
February 1, 2011
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| ISL6312AIRZ-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) |
| ISL6312CRZ | 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:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6312CRZ-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:- 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 |
| ISL6312CRZ-TK | 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:- 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 |
| 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) |
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