参数资料
| 型号： | ISL6568IR |
| 厂商： | Intersil |
| 文件页数： | 23/30页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM BUCK 2PHASE 32-QFN |
| 标准包装： | 60 |
| 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： | 0.84 V ~ 1.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 管件 |
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ISL6568
R COMP = ---------------------------------------
R COMP , 2 = R COMP , 1 ? ----------
Δ V
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 0.01μF.
2. Plug the inductor L and DCR component values, and the
values for C COMP chosen in steps 1, into Equation 26 to
calculate the value for R COMP .
L (EQ. 26)
DCR ? C COMP
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 .
Due to errors in the inductance or DCR it may be necessary to
adjust the value of R COMP 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 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.
3. Select a new value, R COMP,2 , for the time constant resistor
based on the original value, R COMP,1 , using the following
equation.
Δ V 1 (EQ. 28)
2
4. Replace R COMP with the new value and check to see that
the error is corrected. Repeat the procedure if necessary.
R S = ------------------------- ? R COMP ? DCR
I FL
V DROOP
(EQ. 27)
After choosing a new value for R COMP , it will most likely be
necessary to adjust the value of R S to obtain the desired full
load droop voltage. Use Equation 27 to obtain the new value
L
V L (s)
DCR
I OUT
for R S .
PHASE1
INDUCTOR
IL 1
V OUT
R S
L
DCR
C OUT
Δ V 1
Δ V 2
-
PHASE2
ISUM
ICOMP
R S
C COMP
INDUCTOR
IL 2
R COMP
Δ I
V OUT
I TRAN
V DROOP
+
IREF
(optional)
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
Compensation
ISL6568
FIGURE 18. DCR SENSING CONFIGURATION
23
The two opposing goals of compensating the voltage regulator
are stability and speed.
The load-line regulated converter behaves in a similar manner
to a peak current mode controller because the two poles at the
output filter L-C resonant frequency split with the introduction
of current information into the control loop. The final location
of these poles is determined by the system function, the gain
of the current signal, and the value of the compensation
components, R C and C C .
FN9187.5
January 12, 2012
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| ISL6568IR-T | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-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) |
| ISL6568IRZ | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-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 |
| ISL6568IRZA | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-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 |
| ISL6568IRZA-T | 功能描述:IC CTRLR PWM BUCK 2PHASE 32-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 |
| ISL6568IRZR5184 | 功能描述:IC CTRLR PWM 2PHASE BUCK 32-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 |
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