參數(shù)資料
型號(hào)： L6706
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, QCC40
封裝： 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40
文件頁數(shù)： 14/47頁
文件大?。?/td> 623K
代理商： L6706
L6706
Voltage positioning
Doc ID 15698 Rev 2
21/47
where:
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 over
load and line variations
Figure 7.
Voltage positioning with positive offset
8.2
Droop function
This method “recovers” part of the drop due to the output capacitor ESR in the load
transient, introducing a dependence of the output voltage on the load current: a static error
proportional to the output current causes the output voltage to vary according to the sensed
current.
As shown in Figure 6, the ESR drop is present in any case, but using the droop function the
total deviation of the output voltage is minimized. Moreover, more and more high-
performance CPUs require precise load-line regulation to perform in the proper way.
DROOP function is not then required only to optimize the output filter, but also becomes a
requirement of the load.
The device forces a current IDROOP, proportional to the read current, into the feedback RFB
resistor implementing the load regulation dependence. Since IDROOP depends on the
current information, the output characteristic vs. load current is then given by (neglecting the
OFFSET voltage term):
Where DCR is the inductor parasitic resistance (or sense resistor when used) and IOUT is
the output current of the system. The whole power supply can be then represented by a
V
OUT IOUT
()
V
PROG
R
FB
I
DROOP IOUT
()
1.240V
R
OFFSET
------------------------
–
–
=
V
OS
R
FB
1.240V
R
OFFSET
------------------------
=
R
OFFSET
R
FB
1.240V
V
OS
-------------------
=
COMP
To GND_core
(Remote Sense)
ERROR AMPLIFIER
FB
FBG
RF
CF
VSEN
I
DROOP
To VCC_core
(Remote Sense)
RFB
VPROG
VREF
FBG
GND DROP
RECOVERY
CP
I
OFFSET
1.240V
ROFFSET
OFFSET
I OFFSET
V
OUT
V
PROG
R
FB
I
DROOP
–
V
REF
R
FB
DCR
Rg
------------- I
OUT
–
V
PROG
R
DROOP
I
OUT
–
==
=
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