參數(shù)資料
型號(hào)： ISL6568IRZ
廠商： INTERSIL CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications
中文描述： SWITCHING CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, ROHS COMPLIANT, PLASTIC, MO-220-VHHD, QFN-32
文件頁(yè)數(shù)： 22/28頁(yè)
文件大?。?/td> 716K
代理商： ISL6568IRZ
22
FN9187.3
July 25, 2005
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 0.01
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
.
R
COMP
DCR C
COMP
---------------------------------------
=
(EQ. 26)
R
S
------------------------
R
COMP
DCR
=
(EQ. 27)
FIGURE 18. DCR SENSING CONFIGURATION
-
+
ICOMP
DCR
L
INDUCTOR
IL
1
V
OUT
C
OUT
-
+V
L
(s)
DCR
L
INDUCTOR
IL
2
PHASE1
PHASE2
R
S
R
S
R
COMP
C
COMP
ISUM
IREF
ISL6568
-
+
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
ISL6568
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