參數(shù)資料
型號： LTC3816EFE#TRPBF
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
文件頁數(shù)： 16/44頁
文件大?。?/td> 753K
代理商： LTC3816EFE#TRPBF
LTC3816
3816f
applicaTions inForMaTion
theNTCcompensationnetwork.Todeterminethecompo-
nent values, first, select the NTC with room temperature
resistance approximately equal to RVDCR that has the
smallest temperature coefficient (
β constant in the NTC
data sheet. Using an NTC with a higher
β constant gen-
erates a less optimal temperature compensation). Next,
calculatetheresistancesRPARandRSERfromthefollowing
equationswheretheNTCresistancesatdifferenttempera-
tures is obtained from the manufacturer’s data sheet.
R
at
C
R
at C
PAR
NTC
SER
PAR
NTC
=
°
≈
°
(
)
(
)
||
–
25
10
3
0
RR
R
at
C
R
at
C
PAR
NTC
PAR
NTC
||
–
||
75
25
°
(
)
(
)
°
(
))
(
)
Note that the above equations optimize temperature
compensation at hot. At extreme cold temperature, the
temperature compensation is less effective.
With the NTC resistor network, the temperature compen-
sated AVP transfer function becomes:
VOUT=VDAC–AAVP(DCRN)IL=VDAC–AG(DCRN)ILRDCR
where AAVP(DCRN) and AG(DCRN) are the AVP and DCR gain
usingtheinductorDCRcurrentsensewithNTCtemperature
compensation configuration.
A
R
and A
R
AVP DCRN
G DCRN
DCR
G DCRN
NTCNET
A
(
)
(
)
(
)
=
VVPDCRN
VDCRN
NTCNET
DCR
NTCNET
SER
PAR
C
L
R
=
+
|| NNTC
(
)
Figure 11a shows the room temperature AVP DC transfer
curvesobtainedusinginductorDCRcurrentsensewithand
without NTC temperature compensation. There is only a
slight difference in the transfer curve at heavy load. Figure
11b shows the AVP transfer curve obtained at 125°C, it
shows the improvement in AVP accuracy with the NTC
resistor network.
Figure 12 shows another easy way to compensate for the
inductor DCR temperature coefficient. In this configura-
tion, a linear PTC resistor is connected from the SW node
to the ITCFB pin. The PTC thermistor’s temperature coef-
ficient of 0.411%/°C compensates for the change in DCR
ILOAD (A)
0
V OUT
(V)
0.97
0.98
0.99
15
25
3816 F11a
0.96
0.95
0.94
5
10
20
1.00
1.01
1.02
30
IDEAL + 1.5%
IDEAL
IDEAL – 1.5%
WITH NTC
WITHOUT NTC
TA = 25°C
Figure 11a. AVP Transfer Curve Using Vishay
IHLP-5050CE-01 0.33H (DCR = 1.3mΩ) Inductor
DCR Current Sense with AG(DCRN) = 1 at TA = 25°C
ILOAD (A)
0
V OUT
(V)
0.97
0.98
0.99
15
25
3816 F11b
0.96
0.95
0.94
5
10
20
1.00
1.01
1.02
30
IDEAL + 1.5%
IDEAL
IDEAL – 1.5%
WITH NTC
WITHOUT NTC
TA = 125°C
Figure 11b. Same Setup as Figure 11a. Improvement
in AVP Accuracy with NTC Temperature Compensation
Network at TA = 125°C
+
QB
D
QT
VIN
L
COUT
3916 F12
VOUT
IL
INDUCTOR
DCR
LPTC
CVDCRP
LPTC: VISHAY TPFT1206 SERIES, 4110ppm/°C
TG
BG
BSOURCE
ITCFB
ISENN
ITC
LTC3816
SW
RVDCRP
+
–
AITC
Figure 12. AVP Using Inductor DCR Current Sense
with Linear PTC Temperature Compensation
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