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PM6652 Datasheet(PDF) 46 Page - STMicroelectronics

Part # PM6652
Description  Single-phase controller for Intel MVP 6.5 render voltage regulator,
PDF  53 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6652 Datasheet(HTML) 46 Page - STMicroelectronics

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PM6652
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Doc ID 16867 Rev 5
9.2
Voltage regulation without droop
PM6652 can be suitable also for high current DC-DC conversion requiring high precision
load regulation and no load line function.
Figure 49.
No load line output reference schematic
In
Figure 49 the typical current sensing filter (R31, C15) has been modified by adding C60
and R32, in order to disable the load line (or droop) function.
The switching regulator AC behavior is not affected by C60-R32 insertion if the following
design rules are followed:
●
C60<<C15
●
C15*R31=L1/RDCR
●
1/(2*
π*R32*C60)<<fsw
●
R32 value should fall in the range 1 k
Ω
÷ 10 kΩ, as suggested in Section 8.7: Current
sensing.
With the modified current sensing filter the output voltage load regulation is almost
independent of the output load, taking full advantage of the differential remote feedback. In
fact
Equation 9 now becomes:
Equation 34
The previous result shows that the DC sensed current is zero; as a consequence, the DC
output voltage is given by:
C15
C60
SVCC
SVCC
CPU VCCIO
PCH CORE
R2
SVCC
R5
COREON
R8
VIN
PGOOD
DPRSLPVR
C30
+
C17
VID6
C11
C3
VID5
C9
R31
L1
+5V
VID4
VID3
R10
Q1
4
VID2
C5
C6
R3
3V3
VID1
VID0
C8
Q3
4
VIN
R32
+
C13
C2
SVCC
U1
PM6652
VRTT#
1
THERM
2
GSNS
3
VSNS
4
CSNS
5
VOUT
6
COMP
7
SVCC
8
DPRSLPVR
17
PGND
18
LGATE
19
PVCC
20
CLKEN#
21
BOOT
22
HGATE
23
PHASE
24
thermal
33
+
C18
()
s
R
C
1
s
R
C
s
1
R
sL
1
s
i
R
V
C
32
60
31
15
DCR
1
L
DCR
OUT
SNS
+
⋅
⋅
⋅
+
+
⋅
⋅
=
−



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