TLE4998P4 datasheet(14/34 Pages) INFINEON

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TLE4998P

Electrical, Thermal and Magnetic Parameters

Data Sheet

V 1.0, 2008-07

Calculation of the Junction Temperature

The total power dissipation PTOT of the chip increases its temperature above the ambient

temperature.

The power multiplied by the total thermal resistance

RthJA (Junction to Ambient) leads

to the final junction temperature.

RthJA is the sum of the addition of the values of the two

components

Junction to Case and Case to Ambient.

RthJA = RthJC + RthCA

TJ = TA + ∆T

∆T = R

thJA x PTOT = RthJA x ( VDD x IDD + VOUT x IOUT )

IDD , IOUT > 0, if direction is into IC

Example TLE4998P4 (assuming no load on Vout):

–

VDD = 5 V

–

IDD = 8 mA

–

∆T = 240 [K/W] x (5 [V] x 0.008 [A] + 0 [VA] ) = 9.6 K

For moulded sensors, the calculation with RthJC is more adequate.

Magnetic Parameters

Table 6

Magnetic Characteristics

Parameter

Symbol Limit Values

Unit

Notes

min.

typ.

max.

Sensitivity

S1)

1) Defined as

∆DY

PWM / ∆B

± 0.2

± 6

%/mT

2)3)

2) Programmable in steps of 0.024%

3) @ V

DD = 5V and TJ = 25°C

Temperature

coefficient of sensitivity

-150

150

ppm/

°C

See Figure 5

4) For any 1st and 2nd order polynomial, coefficient within definition in chapter 8

Magnetic field range

MFR

± 50

± 1005) ± 200

Programmable 6)

Integral nonlinearity

Inl

- 0.1

0.1

%MFR 7)9)

Magnetic offset

BOS

- 400

400

µT

8)9)

Magnetic offset drift

∆B

- 5

µT / °C Error band 9)

Magnetic hysteresis

BHYS

µT

10)

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