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| 型号： | L6716TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48 |
| 文件页数： | 19/57页 |
| 文件大小： | 829K |
| 代理商： | L6716TR |
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Voltage positioning
L6716
26/57
Doc ID 14521 Rev 3
11
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 11).
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 11.
Voltage positioning (left) and droop function (right)
11.1
Offset (optional)
The OFFSET pin allows programming a positive offset (VOS) for the output voltage by
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 (See 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 12. 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
V
OUT IOUT
()
V
PROG
R
FB
I
DROOP IOUT
()
1.240V
R
OFFSET
------------------------
–
–
=
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