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LTC4098-1 データシート(PDF) 25 Page - Linear Technology

部品番号 LTC4098-1
部品情報  USB Compatible Switching Power Managers/Li-Ion Chargers with Overvoltage Protection
PDF  32 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LTC4098-1 データシート(HTML) 25 Page - Linear Technology

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LTC4098/LTC4098-1
25
40981fb
rHOT = Ratio of RNTC|HOT to R25
RNOM = Primary thermistor bias resistor (see Figure 9a)
R1 = Optional temperature range adjustment resistor
(see Figure 9b)
The trip points for the LTC4098/LTC4098-1’s temperature
qualification are internally programmed at 0.349 • NTCBIAS
for the hot threshold and 0.765 • NTCBIAS for the cold
threshold.
Therefore, the hot trip point is set when:
R
RR
NTCBIAS
NTCBIAS
NTCHOT
NOM
NTCHOT
|
|
•.
•
+
= 0 349
and the cold trip point is set when:
R
RR
NTCBIAS
NTCBI
NTC COLD
NOM
NTC COLD
|
|
•.
•
+
= 0 765
A
AS
adjustment resistor, both the upper and the lower tempera-
ture trip points can be independently programmed with
the constraint that the difference between the upper and
lower temperature thresholds cannot decrease. Examples
of each technique are given below.
NTC thermistors have temperature characteristics which
are indicated on-resistance temperature conversion tables.
The Vishay-Dale thermistor NTHS0603N011-N1003F, used
in the following examples, has a nominal value of 100k
and follows the Vishay curve 1 resistance-temperature
characteristic.
In the explanation below, the following notation is used.
R25 = Value of the thermistor at 25°C
RNTC|COLD = Value of thermistor at the cold trip point
RNTC|HOT = Value of thermistor at the hot trip point
rCOLD = Ratio of RNTC|COLD to R25
–
+
–
+
RNOM
100k
RNTC
100k
NTC
0.1V
NTC_ENABLE
40981 F09a
LTC4098/LTC4098-1
NTC BLOCK
TOO_COLD
TOO_HOT
0.765 • NTCBIAS
0.349 • NTCBIAS
–
+
5
NTCBIAS
4
T
–
+
–
+
RNOM
105k
RNTC
100k
R1
12.7k
NTC
0.1V
NTC_ENABLE
40981 F09b
TOO_COLD
TOO_HOT
0.765 • NTCBIAS
0.349 • NTCBIAS
–
+
5
LTC4098/LTC4098-1
NTC BLOCK
T
NTCBIAS
4
(9a)
(9b)
Figure 9. NTC Circuits
APPLICATIONS INFORMATION



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