參數(shù)資料
型號(hào): LTC3766EUFD#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28
封裝: 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28
文件頁(yè)數(shù): 42/60頁(yè)
文件大?。?/td> 607K
代理商: LTC3766EUFD#PBF
LTC3766
47
3766f
APPLICATIONS INFORMATION
Remote Sensing
The LTC3766 contains a precision differential amplifier for
useinremotesensingapplications.AsshowninFigure14a,
this is useful in eliminating the voltage drops associated
with bussing the power supply output voltage to a remote
load. Be aware that the differential amplifier is powered
from the VIN pin of the LTC3766, and requires 1.5V of
overhead on VIN above the output voltage (VSOUT). If the
voltage on the VIN pin is not adequate to support the VSOUT
voltage, the LTC3766 will generate a fault. This is neces-
sary to avoid a potential overvoltage on the main output
of the converter. In addition, the LTC3766 will generate a
fault if the polarity of the VS+ and VS– pins are reversed
by approximately 0.3V or more.
In rare applications, it may be useful to raise the common
mode voltage of the VS+ and VS– inputs. When doing so,
alwaysensurethatVS+<2(VIN–2V)topreventsaturating
the input stage of the differential amplifier. If the input
stage is saturated, the LTC3766 forces the VSOUT pin to
0V. In applications where the differential amplifier is not
needed, connect the inputs as shown in either Figure14b
or Figure 15.
Self-Starting PolyPhase Applications
Figure 34 shows the PolyPhase connections for the
LTC3765 and LTC3766. On the primary side, the design
of one phase of the LTC3765 can be optimized and then
replicated up to four times by simply tying the SSFLT pins
together. The common SSFLT pins are held low until all
phases have adequate voltage on their VCC supplies and
RUN pins. This prevents any of the phases from switching
until every phase has satisfied the requirements for start-
up. When start-up conditions have been met, the SSFLT
pin is released and quickly charged until all phases have
IN+
NDRV
RUN
VCC
SSFLT
CSSP
CVCC
RFSP
RFSS
R1
VIN+
VIN–
R2
IN
FS/UV
LTC3765
LTC3766
(MASTER)
GND
NDRV
GND
VIN
VBIAS
PHASE 1 (MASTER)
VCC
FB
VOUT+
VOUT–
PT+
SS
ITH
PT
FS/SYNC
CSSS
IN+
NDRV
RUN
VCC
SSFLT
CSSP
CVCC
RFSP
R1
VIN+
VIN–
R2
IN
FS/UV
LTC3765
LTC3766
(SLAVE)
GND
NDRV
GND
VIN
VBIAS
PHASE 2 (SLAVE)
VCC
FB
VOUT–
3766 F34
CSSS
PT+
FS/SYNC
VS–
VS+
VSOUT
ITH
SS
PT
PHASE
Figure 34. PolyPhase Connections
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