DescriptionThe LB1857M is a three-phase, brushless-motor driver IC for video cassette recorder capstan and drum motors and digital audio tape (DAT) drive motors.The LB1857M features 120° electrical phasing, torque ripple compensation and thermal shutdown circuits and an FG amplifier. It haas a power-saving speed control,making it ideal for portable devices.The LB1857M operates fronn 4 to 14 V motor drive and 4 to 6 V control supplies, and is available in 30-pin MFPs.
Features of the LB1857M are:(1)120° electrical phasing; (2)power-saving motor speed control; (3)FG amplifier; (4)standby mode; (5)torque ripple compensation circuit; (6)thermal shutdown circuit; (7)4 to 14 V motor drive and 4 to 6 V control supplies; (8)30-pin MFP.Motor driver operation is determined by the levels on STBY, BR and FRC. Standby mode is ON when STBY is LOW, and OFF when STBY is HIGH or open. Motor braking is ON when BR is HIGH. the motor is forward mode when FRC is LOW, and in reverse mode, when FRC is HIGH.
The absolute maximum ratings of the LB1857M can be summarized as:(1)control supply voltage:7V;(2)storage temperature range:-55 to 125;(3)operating temperature range:-20 to 75;(4)power amplifier supply voltage:16V;(5)power dissipation:1.0 W.The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).
LB1857M Data Sheet
