LB1868

Ordering number : EN6202A LB1868 Monolithic Digital IC 2-phase Brushless Fan Motor Driver http://onsemi.com Overview The LB1868 is a 2-phase unipolar brushless motor driver. With only a few peripheral parts, lockup protection and automatic recovery can be implemented. The IC can be configured for 12V or 24V operation and a wide range of variations, from Low speed to H-High speed and from 60cm to 120cm square using the same PCB. This makes it easy to design highly reliable fan motor installations. Features Output protection Zener diode with variable withstand voltage Z1, Z2 pins open: VOLM = 57V (24V specification) Z1, Z2 pins shorted: VOLM = 32V (12V specification) External Zener diode connected across Z1 − VCC pins: support for fans with large drive current External resistor allows configuration for 12V or 24V Direct Hall element connection possible (built-in Hall amplifier with hysteresis supports core without auxiliary electrode) Built-in output transistor with 1.0A output current (strengthened negative-current support for core without auxiliary electrode) Built-in rotation detection function: Low during rotation and High during stop Built-in lockup protection with automatic recovery Built-in thermal shutdown Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum input current Maximum applied output voltage Maximum output current Maximum current flowing into RD pin Maximum RD applied voltage Allowable power dissipation Operating temperat...