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PM6652 Fiches technique(PDF) 44 Page - STMicroelectronics

No de pièce PM6652
Description  Single-phase controller for Intel MVP 6.5 render voltage regulator,
PDF  53 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6652 Fiches technique(HTML) 44 Page - STMicroelectronics

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Application ideas
PM6652
44/53
Doc ID 16867 Rev 5
9
Application ideas
9.1
Load transient response improvement with feedback
capacitor
Referring to
Figure 2, the droop gain network made by R14, R15, R17 and R18 can be
improved by adding the feedback capacitor C34. As a consequence, the performed load line
previously summarized in
Equation 8 is now described in Equation 31 below:
Equation 31
The sensed current information is still given by:
Equation 32
By joining the two previous results, the complete droop equation becomes:
Equation 33
In order to get an almost flat droop function, from DC to high frequency, and a “squared”
load transient response, the above equation requires two conditions:
●
C34*R17=L/RDCR
●
C34*R17//R14=C15*RA//RB
If R17>R14 (typical application), C15*RA//RB< L/RDCR so the high frequency sensed current
is bigger compared to what can be sensed when the feedback capacitor is not mounted.
This feature can be very helpful when low DCR inductors are used and the sensed current
ripple, CSNS-VOUT, is lower than about 10 mVPP.
In order to avoid any output voltage undershoots during load transient, the above mentioned
conditions should be translated into:
●
C34*R17≥L/RDCR
●
C15*RA//RB≥C34*R17//R14
The two components used to fine tune the load transient response are C34 and C15, since
the other components are fixed when the droop is programmed and the inductor has already
been selected.
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