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參數(shù)資料
| 型號(hào)： | ISL6566CRR5184 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Three-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件頁(yè)數(shù)： | 23/29頁(yè) |
| 文件大小： | 793K |
| 代理商： | ISL6566CRR5184 |
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23
FN9178.4
March 9, 2006
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
values for C
COMP
chosen in steps 1, into Equation 26 to
calculate the value for R
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
DROOP
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
, set the oscilloscope to 500
μ
s/div.
2. Record
V1 and
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.
V
2
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
.
Compensation
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
.
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.
R
COMP
DCR C
COMP
---------------------------------------
=
(EQ. 26)
R
S
------------------------
R
COMP
DCR
=
(EQ. 27)
FIGURE 18. DCR SENSING CONFIGURATION
-
+
ICOMP
R
S
DCR
L
INDUCTOR
IL
1
C
OUT
-
+V
L
(s)
DCR
L
INDUCTOR
IL
2
DCR
L
INDUCTOR
IL
3
PHASE1
PHASE2
PHASE3
R
S
R
S
R
COMP
C
COMP
ISUM
IREF
ISL6566
-
+
V
DROOP
I
OUT
(optional)
R
COMP 2
R
COMP 1
1
----------
=
(EQ. 28)
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
V
1
V
OUT
I
TRAN
V
2
I
FIGURE 20. COMPENSATION CONFIGURATION FOR
LOAD-LINE REGULATED ISL6566 CIRCUIT
ISL6566
COMP
C
C
R
C
R
FB
FB
VDIFF
C
2
(OPTIONAL)
ISL6566
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| ISL6566CR-T | 功能描述:IC CTRLR PWM BUCK 3PHASE 40-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
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