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參數(shù)資料
| 型號： | LTC4155IUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 36/52頁 |
| 文件大小： | 473K |
| 代理商： | LTC4155IUFD#TRPBF |
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LTC4155
41
4155f
APPLICATIONS INFORMATION
RTEMP_RANGE
Optional dilution resistor, connected in series with
the thermistor.
αT ≡
rT
r25
ThermistorresistanceratioatanytemperatureTrelative
to its reference temperature.
αTOO_COLD ≡
rTOO_COLD
r25
Thermistor resistance ratio at desired NTC_TOO_COLD
threshold temperature relative to its reference
temperature.
αTOO_ WARM ≡
rTOO_ WARM
r25
Thermistor resistance ratio at desired NTC_TOO_WARM
threshold temperature relative to its reference
temperature.
αHOT_FAULT ≡
rHOT_FAULT
r25
ThermistorresistanceratioatdesiredNTC_HOT_FAULT
threshold temperature relative to its reference tem-
perature.
αBIAS ≡
RBIAS
r25
Ratio of low drift bias resistor to r25.
αTEMP_RANGE ≡
RTEMP_RANGE
r25
Ratio of optional low drift dilution resistor to r25.
Note that r25, rT, rTOO_COLD, rTOO_WARM, and rHOT_FAULT
and are all resistance values of the thermistor at different
temperatures, while RBIAS and RTEMP_RANGE are actual
low drift resistors.
In all of the following calculations, it will be necessary to
determine the thermistor’s
αT at various temperatures.
This parameter is dependent only upon the material prop-
erties of the thermistor.
αT for a given thermistor and
temperature may be found in one of two ways. Thermistor
manufacturers often provide a lookup table relating
αT to
temperature in their data sheets. For any temperature T,
αT may be referenced directly.
The second way to obtain
αT for any T requires the use
of a modeling equation and a material constant specific
to the thermistor:
αT = e
b
1
T
1
T0
where:
e = Natural logarithm base, approximately 2.71828
T = Temperature of interest, expressed in Kelvin
T0 = Thermistor model nominal temperature, expressed
in Kelvin. Typically 298.15K (25°C + 273.15°C)
b = Model material constant, expressed in Kelvin. This
model is a curve fit at T0 and a second temperature. b is
close to 4000K for most thermistors. Higher
b results in
increasedtemperaturesensitivityattheexpenseofreduced
linearity over a wide temperature range
Simple Alternate Thermistor Bias Network
By simply adjusting the bias resistor, RBIAS, and omitting
the optional RTEMP_RANGE, one of the three temperature
thresholds may be adjusted. The other two temperature
comparator thresholds will be determined by the choice
of the first temperature threshold and the NTCVAL
thresholds fixed in the LTC4155. Increasing RBIAS above
r25 shifts all three temperature thresholds colder while
simultaneously slightly compressing the temperature
span between thresholds. Likewise, decreasing RBIAS
below r25 shifts all three temperature thresholds warmer
while simultaneously slightly expanding the temperature
span between thresholds. To program a single tem-
perature threshold, obtain the value of either
αTOO_COLD,
αTOO_WARM or αHOT_FAULT for the chosen temperature
threshold using one of the aforementioned methods and
substitute into the appropriate following equation to cal-
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