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參數(shù)資料
| 型號： | LTC4155EUFD#PBF |
| 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)： | 37/52頁 |
| 文件大?。?/td> | 473K |
| 代理商： | LTC4155EUFD#PBF |
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LTC4155
42
4155f
APPLICATIONS INFORMATION
culate the value
αBIAS and then RBIAS.
αBIAS = 0.34917 αTOO_COLD
αBIAS = 1.73735 αTOO_WARM
αBIAS = 3.35249 αHOT_FAULT
RBIAS = αBIAS r25
With
αBIAS for the newly programmed temperature
threshold now determined, the other two dependent tem-
perature thresholds may be found by substituting
αBIAS
into the remaining two equations. The following equation
maybeusedtoconvertanyotherNTCADCresult(NTCVAL)
back to a resistance ratio by substituting the
kSPAN and
kOFFSETvaluesfoundintheElectricalCharacteristicstable.
αT =
kSPAN NTCVAL + kOFFSET
1
kSPAN NTCVAL – kOFFSET
αBIAS
αT may then be used to determine the temperature using
either the lookup table provided by the thermistor manu-
facturer or the curve fit model:
T
=
b
ln (
αT)+
b
T0
Advanced Alternate Thermistor Bias Network
IfanadjustmenttoRBIASdoesnotyieldanacceptablespan
between temperature thresholds, a second low drift bias
resistor may be added to the bias network between the
NTC pin and the top of the thermistor. This resistor has
the net effect of diluting the high thermal sensitivity of the
thermistor with low drift resistance. The result is reduced
thermal gain and a wider temperature span between the
preprogrammed voltage thresholds of the LTC4155. Us-
ing this additional resistor, two of the three temperature
comparator thresholds may be adjusted. The remaining
threshold is constrained by the limited degrees of freedom
of the bias network. After determining the
αT values for
the two temperature thresholds of interest, the following
equationsmaybeusedtodetermine
αBIAS,αTEMP_RANGE,
andthethirdconstrainedtemperaturethresholddependent
on the choice of bias network and the thermistor.
To specify TTOO_COLD and TTOO_WARM, then calculate
THOT_FAULT:
αTEMP_RANGE = 0.25153 αTOO_COLD – 1.25153
αTOO_WARM
RTEMP_RANGE = αTEMP_RANGE r25
αBIAS = 0.43699 (αTOO_COLD – αTOO_WARM)
RBIAS = αBIAS r25
With the bias network determined, the overconstrained
threshold may then be calculated:
αHOT_FAULT = 0.29829 αBIAS – αTEMP_RANGE
To specify TTOO_COLD and THOT_FAULT, then calculate
TTOO_WARM:
αTEMP_RANGE = 0.11626 αTOO_COLD – 1.11626
αHOT_FAULT
RTEMP_RANGE = αTEMP_RANGE r25
αBIAS = 0.38976 (αTOO_COLD – αHOT_FAULT)
RBIAS = αBIAS r25
With the bias network determined, the overconstrained
threshold may then be calculated:
αTOO_WARM = 0.57559 αBIAS – αTEMP_RANGE
To specify TTOO_WARM and THOT_FAULT, then calculate
TTOO_COLD:
αTEMP_RANGE = 1.07566 αTOO_WARM – 2.07566
αHOT_FAULT
RTEMP_RANGE = αTEMP_RANGE r25
αBIAS = 3.60615 (αTOO_WARM – αHOT_FAULT)
RBIAS = αBIAS r25
With the bias network determined, the overconstrained
threshold may then be calculated:
αTOO_COLD = 2.863946 αBIAS – αTEMP_RANGE
It is possible to obtain a negative result for RTEMP_RANGE
which is not physically realizable using the previous equa-
tions. A negative result indicates that the two chosen tem-
peraturethresholdsaretoocloseintemperatureandrequire
more thermal sensitivity than the thermistor can provide.
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