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US890 Datasheet(PDF) 3 Page - Melexis Microelectronic Systems |
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US890 Datasheet(HTML) 3 Page - Melexis Microelectronic Systems |
3 / 12 page US890 / US891 Two-Coil Fan Driver – High Output Current 3901000890 Rev 003 Page 3 of 12 Data Sheet Apr/12 3 Glossary of Terms Two-coil fan A fan with two-coil windings where current alternates from 1 coil to the other depending on the direction of the magnetic field. MilliTesla (mT), Gauss Units of magnetic flux density : 1mT = 10 Gauss VDD Voltage on the common point of the fan coils. IDD Current supplying the chip which flows through the coil connected to the switched off output driver. Peak output current The current flowing in the coil at start-up, only limited by the coil resistance RCOIL and the output driver resistance RDSON. Continuous output current The average current flowing in the coil when the fan is spinning normally. Locked rotor The state when the fan stopped spinning due to mechanical blockage. FG Frequency generator or tachometer output RD Rotation detection or alarm output 4 Absolute Maximum Ratings Parameter Symbol Value Units Fan Supply Voltage VDD 18 V Peak Output Current IOUTp 1200 mA Continuous Output Current IOUTc 600 mA FG/RD Pull-Up Voltage VFG, RD 18 V FG/RD Reverse Current IFG_REV, RD_REV 60 mA Operating Temperature Range TA -40 to 85 °C Junction Temperature TJ 125 °C Storage Temperature Range TS -55 to 150 °C Magnetic Flux Density B Unlimited mT ESD Sensitivity (AEC Q100 002) - 4 kV Table 1: Absolute maximum ratings Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum- rated conditions for extended periods may affect device reliability. 5 Pin Definitions and Descriptions Pin Name Pin number Function FG (RD) 1 Frequency Generator (Rotation Detection) Open Drain Output OUT1 2 Open Drain Coil Driver 1 OUT2 3 Open Drain Coil Driver 2 GND 4 Ground pin Table 2: Pin definitions and descriptions |
Similar Part No. - US890_14 |
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Similar Description - US890_14 |
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