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参数资料
| 型号： | L6713ATR |
| 厂商： | Holtek Semiconductor Inc. |
| 英文描述： | 2/3 Phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs |
| 中文描述： | 2 / 3为英特尔VR10，VR11和AMD的嵌入式驱动器相控制器6位CPU |
| 文件页数： | 29/64页 |
| 文件大小： | 515K |
| 代理商： | L6713ATR |
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L6713A
Voltage positioning
35/64
12
Voltage positioning
Output voltage positioning is performed by selecting the reference DAC and by
programming the Droop Function and Offset to the reference (See Figure 11). The currents
sourced from DROOP and sunk from VSEN pins cause the output voltage to vary according
to the external RFB and ROFFSET resistor.
The output voltage is then driven by the following relationship:
DROOP function can be disabled as well as the OFFSET: connecting DROOP pin and FB
pin together implements the load regulation dependence while, if this effect is not desired,
by shorting DROOP pin to SGND it is possible for the device to operate as a classic Voltage
Mode Buck converter. The DROOP pin can also be connected to SGND through a resistor
obtaining a voltage proportional to the delivered current usable for monitoring purposes.
OFFSET can be disabled by using ROFFSET equal to zero.
Figure 11. Voltage positioning (left) and droop function (right)
12.1
Offset (Optional)
The IOFFSET current (See Table 4) sunk from the VSEN pin allows programming a positive
offset (VOS) for the output voltage by connecting a resistor ROFFSET between VSEN pin and
VOUT, as shown in the Figure 11; this offset has to be considered in addition to the one
already introduced during the production stage for the Intel VR10,VR11 Mode.
The output voltage is then programmed as follow:
Offset resistor can be designed by considering the following relationship:
Offset automatically given by the DAC selection differs from the offset implemented through
the IOFFSET current: the built-in feature is trimmed in production and assures ±0.5% error
(±0.6% for the AMD DAC) over load and line variations.
V
OUT
V
REF
R
FB
R
OFFSET
+
()
I
DROOP
()
R
OFFSET
()
I
OFFSET
()
+
–
=
V
REF
VID
19mV
–
VR10 - VR11
VID
AMD 6BIT
=
COMP
To GND_core
(Remote Sense)
ERROR AMPLIFIER
FB
FBG
RF
CF
DROOP
VSEN
I
DROOP
To VCC_core
(Remote Sense)
RFB
ROFFSET
VPROG
VREF
FBG
VSEN
GND DROP
RECOVERY
I
OFFSET
ESR Drop
VMAX
VMIN
VNOM
RESPONSE WITHOUT DROOP
RESPONSE WITH DROOP
CP
V
OUT
V
REF
R
FB
R
OFFSET
+
()
I
DROOP
()
R
OFFSET
()
I
OFFSET
()
+
–
=
R
OFFSET
V
OS
I
OFFSET
----------------------
=
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