TLE4997 Datasheet, PDF (16/36 Pages) Infineon Technologies AG – Programmable Linear Hall Sensor for Industrial Use

TLE4997I
Electrical and Magnetic Parameters
Calculation of the Junction Temperature
The total power dissipation P_TOT of the chip increases its temperature above the ambient
temperature.
The power multiplied with the total thermal resistance R_thJA (Junction to Ambient) leads
to the final junction temperature. R_thJA is the sum of the addition of the values of the two
components Junction to Case and Case to Ambient.
R_thJA = R_thJC + R_thCA
T_J = T_A + ∆T
∆T = 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 noticeable load on Vout):
– V_DD = 5 V
– I_DD = 10 mA
– ∆T = 219 [K/W] x (5 [V] x 0.01 [A] + 0 [VA]) = 11 K
For moulded sensors, the calculation with R_thJC is more adequate.
Magnetic Parameters
Table 5
Magnetic Characteristics
Parameter
Symbol Limit Values
Unit Notes
min. typ. max.
Sensitivity
S
± 12.5 -
± 300 mV/mT ^{1) 2)}
Magnetic field range MFR ± 50 ± 100³⁾ ± 200 mT
Programmable ⁴⁾
Integral nonlinearity
Magnetic offset
Magnetic offset drift
Inl
B_OS
∆B_OS
-15 -
-500 -
-5 -
15
mV
500 µT
= ± 0.3% of V_DD5)
6) 7) 8)
5
µT / °C Error band ⁷⁾
1) _{Programmable in steps of 0.024%.}
2) _{@ VDD = 5 V and TJ = 25°C}
3) _{This range is also used for temperature and offset pre-calibration of the IC.}
4) _{Depending on the Offset and Gain settings, the output may saturate at lower fields.}
5) _{Inl = Vout - Vout,lse with Vout,lse = least square error fit of Vout.}
Valid in the range (5% of V_DD) < V_OUT < (95% of V_DD)
6) _{In operating temperature range. More information, see “Operating Range” on Page 13.}
7) _{For Sensitivity S > 25 mV / mT. For lower sensitivities, the zero field voltage drift is dominant.}
8) _{Measured at ± 100 mT range.}
Data Sheet
16
V 1.0, 2007-06