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TLE4946H
High Precision Hall-Effect Switch
High Precision Hall-Effect Switch TLE4946H Data Sheet Version 1.0
2003-11-20
Features 2.7V to 24V supply voltage operation Operation from unregulated power supply High sensitivity and high stability of the magnetic switching points High resistance to mechanical stress by Active
Error Compensation Reverse battery protection (-18V) Superior temperature stability Peak temperatures up to 195°C without damage Low jitter (typ. 1µs) High ESD performance (±6kV HBM) Digital output signal
• Bipolar version SMD package P-SC59-3-2 (SOT-23 compatible)
Functional Description The TLE4906H is an integrated circuit Hall-effect sensor designed specifically for highly
accurate applications. Precise magnetic switching points and high temperature stability are achieved by active compensation circuits and chopper techniques on chip.
TLE4946H Circuit Description The chopped Hall IC Switch comprises a Hall probe, bias generator, compensation
circuits, oscillator, and output transistor.
The bias generator provides currents for the Hall probe and the active circuits. Compensation circuits stabilize the temperature behavior and reduce technology
variations.
The Active Error Compensation rejects offsets in signal stages and the influence of mechanical stress to the Hall probe caused by molding and soldering processes and
other thermal stresses in the package. This chopper technique together with the threshold
generator and the comparator ensure high accurate magnetic switching points.
Figure 1: Block Diagram
TLE4946H Pin Configuration Figure 2: Pin Configuration (SOT-23 pin compatible)
Pin Definition and Functions TLE4946H Absolute Maximum Ratings Tj = -40 to 150°C
Note: Stresses above those listed here may cause permanent damage to the device.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD Protection Human Body Model (HBM) tests according to:
EOS/ESD Association Standard S5.1-1993 and Mil. Std. 883D method 3015.7
Operating Range TLE4946H AC/DC Characteristics over operating range, unless otherwise specified. Typical values correspond to VS=12V
and TA=25°C. To operate the sensor at the max. switching frequency, the value of the magnetic signal
amplitude must be 1.4 times higher than for static fields. This is due to the -3dB corner frequency of the low pass filter in the signal path. 2) Systematic delay between magnetic threshold reached and output switching. 3) Jitter is the unpredictable deviation of the output switching delay. 4) BREP is equivalent to the noise constant. 5) Time from applying VS >= 2.7 V to the sensor until the output state is valid. 6) Thermal resistance from junction to ambient. e.g.: VS=12.0 V, IS_typ=4 mA, VQSAT_typ=0.3 V and IQ=20 mA => Power Dissipation Pdis=54.0 mW.
In TA = Tj (RthJA * Pdis) = 175 °C (100 K/W * 0.054 W) => TA = 169.6 °C
TLE4946H Magnetic Characteristics over operating range, unless otherwise specified. Typical values correspond to VS=12V.
Positive magnetic fields related with south pole of magnet to the branded side of package.
Note: Typical characteristics specify mean values expected over the production spread.
Timing Diagram
