參數(shù)資料
型號: LTC3816IUHF#TRPBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PQCC38
封裝: 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38
文件頁數(shù): 30/44頁
文件大?。?/td> 753K
代理商: LTC3816IUHF#TRPBF
LTC3816
3816f
applicaTions inForMaTion
Forthisexample,aVishayIHLP-5050CE-010.33Hinduc-
tor is chosen. According to the inductor data sheet, it has
a maximum DC current rating of 36.5A and a saturation
current of 62A. At room temperature, the typical DCR is
1.3m and the maximum DCR is 1.5m. At 125°C, the
DCR increases to approximately 2.085m. The RIMAX
resistor value can be calculated.
R
I
R
I
A
IMAX
LIMIT
L
DCR
IMAX MIN
=
+
=
2
29 75
2
(
)
.
.0085
9
6 89
m
A
k
= .
Choose 1% resistor RIMAX = 6.98k to ensure that the
regulator can supply the maximum load current under
the worst-case conditions.
If this large DCR variation is a problem, replace this induc-
tor with another inductor with a smaller DCR variation or
use an NTC temperature compensation circuit as shown in
Figure 21. Please refer to the Temperature Compensated
Active Voltage Positioning with Inductor DCR section.
Note that Figure 21 uses a resistive divider and requires
different component values for optimal temperature
compensation.
ToderivethevoltagedropacrosstheinductorDCR(typically
1.3m), place a 0.1F capacitor across the current sense
inputpins,ISENPandISENN.Thecurrentsensefilterresistor
value RIDCR can be calculated from the equation:
R
L
R
C
H
m
F
k
IDCR
DCR
IDCR
=
.
.
.
0 33
1 3
0 1
2 538
Select RIDCR = 2.55k.
For the AVP section (refer to Figure 10), first select a 10k
NTC thermistor. In this example, the Murata NCP18XH103
is chosen. Next, select:
RPAR = RNTC at 25°C = 10k
The RSER resistor value can be obtained from the follow-
ing equation:
R
SER
PAR
(
)
(
)
10
3
||
||
R
at 0°C
R
at 75°
NTC
CC
(
)
(
)
°
(
)
(
)
||
R
at
C
PAR
NTC
25
From the NTC data sheet:
RNTC at 0°C = 27.2k
RNTC at 75°C = 1.925k
QB
RS
VOUT
COUT
D
3816 F21
L
DCR
INDUCTOR
NTC
QT
IL
VIN
TG
BG
BSOURCE
ISENP
ISENN
IMAX
LTC3816
SW
+
RSER
CIDCR
RIMAX
RPAR
Figure 21. Inductor DCR Current Sense Using
NTC Temperature Compensation
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