TLE4998S3 Datasheet, PDF (16/39 Pages) Infineon Technologies AG – Programmable Linear Hall Sensor

TLE4998S
Electrical, Thermal, and Magnetic Parameters
Calculation of the Junction Temperature
The internal power dissipation P_TOT of the sensor increases the chip junction
temperature above the ambient temperature.
The power multiplied by the total thermal resistance R_thJA (Junction to Ambient) added
to T_A leads to the final junction temperature. R_thJA is the sum of the addition of the two
components, Junction to Case and Case to Ambient.
R_thJA = R_thJC + R_thCA
T_J = T_A + ΔT
ΔT = R_thJA x P_TOT = R_thJA x ( V_DD x I_DD + V_OUT x I_OUT )
I_DD , I_OUT > 0, if direction is into IC
Example (assuming no load on Vout and TLE4998S4 type):
– V_DD = 5 V
– I_DD = 8 mA
– ΔT = 240 [K/W] x (5 [V] x 0.008 [A] + 0 [VA] ) = 9.6 K
For moulded sensors, the calculation with R_thJC is more adequate.
Magnetic Parameters
Table 6
Magnetic Characteristics
Parameter
Symbol Limit Values
Unit Notes
Sensitivity
S¹⁾
Temperature
TC
coefficient of sensitivity
Magnetic field range MFR
Integral nonlinearity INL
Magnetic offset
B_OS
Magnetic offset drift ΔB_OS
Magnetic hysteresis B_HYS
1) _{Defined as ΔOUT / ΔB}
2) _{Programmable in steps of 0.024%}
3) _{@ VDD = 5 V and TJ = 25 °C}
min.
± 8.2
-150
± 50
- 0.1
- 400
-5
0
typ. max.
-
± 245
0
150
± 100⁵⁾ ± 200
-
0.1
0
400
-
5
-
10
LSB₁₂/ Programmable²⁾³⁾
mT
ppm/ ⁴⁾
°C
See Figure 5
mT
Programmable ⁶⁾
%MFR ⁷⁾⁹⁾
μT
8)9)
μT / °C Error band⁹⁾
μT
10)
Data Sheet
16
V 1.0, 2008-07