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L6714 データシート(PDF) 38 Page - STMicroelectronics

部品番号 L6714
部品情報  4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs
PDF  70 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6714 データシート(HTML) 38 Page - STMicroelectronics

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Voltage positioning
L6714
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12.2
Offset (Optional)
The OFFSET pin allows programming a positive offset (VOS) for the output voltage by
connecting a resistor ROFFSET vs. SGND; this offset has to be considered in addition to the
one already introduced during the production stage for the Intel VR10,VR11 Mode.
The OFFSET pin is internally fixed at 1.240V (See Table 4) a current is programmed by
connecting the resistor ROFFSET between the pin and SGND: this current is mirrored and
then properly sunk from the FB pin as shown in Figure 12. Output voltage is then
programmed as follow:
Offset resistor can be designed by considering the following relationship (RFB is fixed by the
Droop effect):
Offset automatically given by the DAC selection differs from the offset implemented through
the OFFSET pin: the built-in feature is trimmed in production and assures ±0.5% error
(±0.6% for the AMD DAC) over load and line variations.
Figure 12. Voltage positioning with offset
V
OUT
V
REF
R
FB
I
DROOP
I
OFFSET
–
()
⋅
–
=
R
OFFSET
1.240V
V
OS
-------------------
R
FB
⋅
=
1.240V
ROFFSET
OFFSET
VREF
FB
COMP
VSEN
64k
FBR
FBG
64k
RF
CF
RFB
To Vcore
(Remote Sense)
DROOP



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