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參數(shù)資料
| 型號： | ISL6566ACR |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Three-Phase Buck PWM Controller with Two Integrated MOSFET Drivers and One External Driver Signal |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, PLASTIC, MO-220-VJJD, QFN-40 |
| 文件頁數(shù)： | 22/28頁 |
| 文件大?。?/td> | 784K |
| 代理商： | ISL6566ACR |
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22
FN9200.2
July 27, 2005
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.
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.
Fortunately, there is a simple approximation that comes very
close to an optimal solution. Treating the system as though it
were a voltage-mode regulator, by compensating the L-C
poles and the ESR zero of the voltage mode approximation,
yields a solution that is always stable with very close to ideal
transient performance.
Select a target bandwidth for the compensated system, f
0
.
The target bandwidth must be large enough to assure
adequate transient performance, but smaller than 1/3 of the
FIGURE 18. DCR SENSING CONFIGURATION
-
+
ICOMP
R
S
DCR
L
INDUCTOR
IL
3
C
OUT
-
+V
L
(s)
DCR
L
INDUCTOR
IL
2
DCR
L
INDUCTOR
IL
1
PHASE3
PHASE2
PHASE1
R
S
R
S
R
COMP
C
COMP
ISUM
IREF
ISL6566A
-
+
V
DROOP
I
OUT
(optional)
To External Driver
PHASE Pin
R
COMP 2
R
COMP 1
V
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 ISL6566A CIRCUIT
ISL6566A
COMP
C
C
R
C
R
FB
FB
VDIFF
C
2
(OPTIONAL)
ISL6566A
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| ISL6566AIRZ | 功能描述:IC CTRLR PWM 3PHASE BUCK 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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