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ISL6566 Fiches technique(PDF) 22 Page - Intersil Corporation

No de pièce ISL6566
Description  Three-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6566 Fiches technique(HTML) 22 Page - Intersil Corporation

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22
FN9178.3
July 25, 2005
Then the resistor RS 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 CCOMP. The recommended
value is 0.01
µF.
2. Plug the inductor L and DCR component values, and the
values for CCOMP chosen in steps 1, into Equation 26 to
calculate the value for RCOMP.
3. Use the new value for RCOMP obtained from Equation
26, as well as the desired full load current, IFL, full load
droop voltage, VDROOP, and inductor DCR in Equation
27 to calculate the value for RS.
Due to errors in the inductance or DCR it may be necessary
to adjust the value of RCOMP 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
µH and
DCR = 1m
Ω, set the oscilloscope to 500µs/div.
2. Record
∆V1 and ∆V2 as shown in Figure 19.
3. Select a new value, RCOMP,2, for the time constant
resistor based on the original value, RCOMP,1, using the
following equation.
4. Replace RCOMP with the new value and check to see that
the error is corrected. Repeat the procedure if necessary.
After choosing a new value for RCOMP, it will most likely be
necessary to adjust the value of RS to obtain the desired full
load droop voltage. Use Equation 27 to obtain the new value
for RS.
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, RC and CC.
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.
RCOMP
L
DCR CCOMP
---------------------------------------
=
(EQ. 26)
RS
IFL
VDROOP
------------------------- RCOMP DCR
⋅⋅
=
(EQ. 27)
FIGURE 18. DCR SENSING CONFIGURATION
ICOMP
RS
DCR
L
INDUCTOR
COUT
IL1
VL(s)
DCR
L
INDUCTOR
DCR
L
INDUCTOR
PHASE1
PHASE2
PHASE3
IL2
IL3
RS
RS
RCOMP
CCOMP
ISUM
IREF
ISL6566
-
+
VDROOP
IOUT
(optional)
RCOMP 2
,
RCOMP 1
,
V1
V2
----------
=
(EQ. 28)
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
∆V1
VOUT
ITRAN
∆V2
∆I
FIGURE 20. COMPENSATION CONFIGURATION FOR
LOAD-LINE REGULATED ISL6566 CIRCUIT
ISL6566
COMP
CC
RC
RFB
FB
VDIFF
C2 (OPTIONAL)
ISL6566


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