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參數(shù)資料
| 型號(hào)： | LTC4095EDC#TRM |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, DFN-8 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大小： | 225K |
| 代理商： | LTC4095EDC#TRM |
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LTC4095
11
4095fa
APPLICATIONS INFORMATION
Alternate NTC Thermistors and Biasing
The LTC4095 provides temperature qualied charging if a
grounded thermistor and a bias resistor are connected to
the NTC pin. By using a bias resistor whose value is equal
to the room temperature resistance of the thermistor (R25)
the upper and lower temperatures are pre-programmed
to approximately 40°C and 0°C, respectively (assuming
a Vishay “Curve 1” thermistor).
The upper and lower temperature thresholds can be ad-
justed by either a modication of the bias resistor value
or by adding a second adjustment resistor to the circuit.
If only the bias resistor is adjusted, then either the upper
or the lower threshold can be modied but not both. The
other trip point will be determined by the characteristics
of the thermistor. Using the bias resistor in addition to an
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 the thermistor at the hot trip point
rCOLD = Ratio of RNTC|COLD to R25
rHOT = Ratio of RNTC|HOT to R25
RNOM = Primary thermistor bias resistor (see Figure 3)
R1 = Optional temperature range adjustment resistor (see
Figure 4)
The trip points for the LTC4095’s temperature qualica-
tion are internally programmed at 0.349 IN for the hot
threshold and 0.765 IN for the cold threshold.
Therefore, the hot trip point is set when:
R
RR
IN
NTCHOT
NOM
NTCHOT
|
.
+
= 0 349
and the cold trip point is set when:
R
RR
IN
NTC COLD
NOM
NTC COLD
|
.
+
= 0 765
Figure 4. NTC Thermistor Circuit with Additional Bias Resistor
Figure 3. Typical NTC Thermistor Circuit
4095 F03
RNOM
100k
RNTC
100k
–
+
–
+
–
+
TOO_COLD
TOO_HOT
NTC_ENABLE
0.765 IN
(NTC RISING)
LTC4095 NTC BLOCK
0.349 IN
(NTC FALLING)
6
NTC
8
IN
0.017 IN
(NTC FALLING)
4095 F04
RNOM
105k
RNTC
100k
–
+
–
+
–
+
TOO_COLD
TOO_HOT
NTC_ENABLE
R1
12.7k
0.765 IN
(NTC RISING)
0.349 IN
(NTC FALLING)
6
NTC
0.017 IN
(NTC FALLING)
8
IN
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