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参数资料
| 型号： | ISL6566EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 23/29页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR ISL6566 |
| 标准包装： | 1 |
| 系列： | * |
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ISL6566
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
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.
? V 1
values for this R-C network.
1. Choose an arbitrary value for C COMP . The recommended
value is 0.01 μ F.
? V
R COMP , 2 = R COMP , 1 ? ----------
2
(EQ. 28)
R COMP = ---------------------------------------
R S = ------------------------- ? R COMP ? DCR
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 .
I FL (EQ. 27)
V DROOP
4. Replace R COMP with the new value and check to see that
the error is corrected. Repeat the procedure if necessary.
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
for R S .
? V 2
? V 1
V OUT
L
V L (s)
DCR
I OUT
PHASE1
INDUCTOR
I TRAN
R S
IL 1
L
DCR
C OUT
? I
PHASE2
INDUCTOR
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
R S
I
L 2
L
DCR
Compensation
The two opposing goals of compensating the voltage
PHASE3
ISUM
R S
C COMP
INDUCTOR
IL 3
R COMP
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
ICOMP
-
V DROOP
+
IREF
(optional)
compensation components, R C and C C .
C 2 (OPTIONAL)
ISL6566
R C
C C
COMP
FIGURE 18. DCR SENSING CONFIGURATION
FB
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
R FB
VDIFF
ISL6566
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 ? , set the oscilloscope to 500 μ s/div.
2. Record ? V1 and ? V2 as shown in Figure 19.
23
FIGURE 20. COMPENSATION CONFIGURATION FOR
LOAD-LINE REGULATED ISL6566 CIRCUIT
Since the system poles and zero are affected by the values of
the components that are meant to compensate them, the
solution to the system equation becomes fairly complicated.
FN9178.4
March 9, 2006
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| ISL6566IRZ | 功能描述:IC CTRLR PWM BUCK 3PHASE 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 |
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| ISL6566IRZAR5184 | 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 |
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