LB1861 - ON Semiconductor

LB1861 Two-Phase Half-Wave Variable Speed Fan Motor Driver

LB1860, LB1860M, LB1861, LB1861M Monolithic Digital IC Two-Phase Half-Wave Variable Speed Fan Motor Driver Overview The LB1860 series ICs are drivers for two-phase unipolar drive DC brushless fan motors. They have functions such as driving, lock protection, restart and speed control. Features  Two-speed mode select function requiring less external component.

Features

 Two-speed mode select function requiring less external component additions : Full speed and Low speed. Or, thermistor-controlled continuous variable-speed function according to ambient operation temperatures. Motor starts rotating at a low speed.
 Motor lock protection and automatic return circuit built in
 Output transistors: Output current IO = 1.5 A, output circuit protection Zener diodes (LB1860 : M-Vz = 57 V/ LB1861: M-Vz = 32 V) Enables low-level noise protection with chip capacitor.
 Built-in thermal shutdown circuit Built-in rotation detect function (Drive mode: ‘‘L’’, Stop mo.