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)： 13/47頁
文件大?。?/td> 623K
代理商： L6706
Voltage positioning
L6706
20/47
Doc ID 15698 Rev 2
8
Voltage positioning
Output voltage positioning is performed by selecting the internal reference value through
VID pins and by programming the droop function and offset to the reference (see Figure 6
on page 20). The currents sourced/sunk from FB pin cause the output voltage to vary
according to the external RFB.
The output voltage is then driven by the following relationship:
where:
OFFSET function can be disabled shorting to SGND the OFFSET pin.
Figure 6.
Voltage positioning (left) and droop function (right)
8.1
Offset (optional)
The OFFSET pin allows programming a positive offset (VOS) for the output voltage by
connecting a resistor ROFFSET vs. SGND as shown in Figure 7; this offset has to be
considered in addition to the one already introduced during the production stage (VPROG =
VID-19 mV).
OFFSET function can be disabled shorting to SGND the OFFSET pin.
The OFFSET pin is internally fixed at 1.240 V (Table 5) 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 7. Output voltage is then
programmed as follow:
V
OUT IOUT
()
V
PROG
R
FB
I
DROOP IOUT
() I
OFFSET
–
[]
–
=
V
PROG
VID
19mV
–
=
I
DROOP IOUT
()
DCR
Rg
------------- I
OUT
=
I
OFFSET
1.240V
R
OFFSET
------------------------
=
ESR Drop
VMAX
VMIN
VNOM
RESPONSE WITHOUT DROOP
RESPONSE WITH DROOP
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
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