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US72EDC Datasheet(PDF) 4 Page - Melexis Microelectronic Systems |
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US72EDC Datasheet(HTML) 4 Page - Melexis Microelectronic Systems |
4 / 9 page US72/73 Single Coil Fan Driver 3901090261 Page 4 of 9 Data Sheet Rev. 002 May/04 4. US72/73 Magnetic Specifications DC Operating Parameters TA = 25, TA = 25 oC, V DD = 12V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units Operate Point Bop 3.0 6.0 mT Release Point Brp -6.0 -3.0 mT Hysteresis Hys 6.0 mT Note: 1 mT = 10 Gauss 5. General Description The US72 / US73 provide a one-chip solution for 2-wire or 3-wire fans with a single coil winding. The chip contains the Hall-effect sensor, dynamic offset correction, and power drivers in a single package. The output drivers and supply pins are fully protected against switching transients. The FG or RD open-drain signal outputs are compatible with any TTL or CMOS logic input. 6. Unique Features The switching of the load current is controlled to limit current slew-rate, and eliminate shoot-through currents. The 200uS (typical) recirculation allows the current to decay, reducing the switching noise. The built-in locked-rotor protection will automatically shut off the coil current when the rotor is mechanically blocked, or the rotational speed drops below 60 RPM. The fan will try to restart every 1.5 seconds until the obstruction is clear. The On / Off cycling reduces the average stall current to 1/6 normal; this is enough to prevent overheating or damage to most fans. A common two-coil fan with unipolar drivers only uses half of the coil windings at any time. The one-coil design with full-bridge drivers uses all the windings all the time to generate torque. This generally allows for a smaller, more efficient stator design. |
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