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參數(shù)資料
| 型號(hào)： | LTC3816EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO38 |
| 封裝： | LEAD FREE, PLASTIC, TSSOP-38 |
| 文件頁(yè)數(shù)： | 15/44頁(yè) |
| 文件大小： | 753K |
| 代理商： | LTC3816EFE#PBF |
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LTC3816
3816f
applicaTions inForMaTion
where AAVP(SR) is the AVP gain with sense resistor con-
figuration and AG(SR) is the sense resistor gain:
A
R
and A
R
tt
R
AVP SR
G SR
SEN
G SR
VSR
AVPSR
VS
( )
=
RR
VSR
SEN
C
ESL
R
=
Figure 9 shows the AVP configuration with current sense
implementedusingtheinductorDCR.TheAVPDCtransfer
function is:
VOUT=VDAC–AAVP(DCR)IL=VDAC–AG(DCR)ILRDCR
where:
A
R
and A
R
AVP DCR
G DCR
DCR
G DCR
VDCR
AVPDCR
(
)
(
)
(
)
=
RR
C
L
R
VDCR
DCR
=
TEMPERATURE COMPENSATED ACTIVE VOLTAGE
POSITIONING (AVP) WITH INDUCTOR DCR
TheinductorDCRAVPconfigurationimprovestheregula-
tor efficiency by eliminating the power losses associated
withasenseresistor.However,withoutpropertemperature
compensation, the positive temperature coefficient of the
inductorDCR,0.39%/°C,maycompromisetheoutputvolt-
age accuracy. As the temperature of the inductor rises, its
DCRvalueincreases,resultinginagreaterVOUTdrooprate
(higherAVPgain).TocompensatefortheDCRtemperature
shift, replace the resistor RVDCR in Figure 9 with an NTC
resistorplacedascloseaspossibletotheinductor.Ideally,
the NTC resistor should have the same temperature as the
inductor. As temperature increases, the NTC resistance
drops,resultinginareductionintheAITCamplifiervoltage
gain.ThiscompensatesfortheincreaseinDCRresistance
and maintains the AVP gain. The NTC resistor, however, is
highly nonlinear and must be linearized. Figure 10 shows
+
QB
D
QT
VIN
ESL
L
COUT
3916 F08
VOUT
IL
SENSE RESISTOR
RSEN
CVSR
RAVPSR
TG
BG
BSOURCE
ITCFB
ISENN
ITC
LTC3816
SW
+
–
RVSR
AITC
+
QB
D
QT
VIN
L
COUT
3916 F09
VOUT
IL
INDUCTOR
DCR
CVDCR
RAVPDCR
TG
BG
BSOURCE
ITCFB
ISENN
ITC
LTC3816
SW
RVDCR
+
–
AITC
Figure 8. AVP Configuration with a Sense Resistor
Figure 9. AVP Configuration with Inductor DCR Current Sense
+
QB
D
QT
VIN
L
COUT
3916 F10
VOUT
IL
INDUCTOR
DCR
NTC
CVDCRN
RAVPDCRN
TG
BG
BSOURCE
ITCFB
ISENN
ITC
LTC3816
SW
RPAR
RSER
+
–
AITC
Figure 10. AVP with Inductor DCR Current Sense
and NTC Temperature Compensation
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