LB1861M-TLM-H

Overview

The LB1861M-TLM-H is a two-phase half-wave variable speed fan motor driver manufactured by Sanyo Semicon Device. It supports unipolar drive DC brushless fan motors with built-in lock protection, restart capabilities, and speed control functions. The device features output transistors rated for an output current of 1.5 A and includes internal Zener diodes with a maximum voltage (Vz) of 32 V for low-level noise protection. It operates from either a 12 V or 24 V power supply via external resistor selection and integrates a thermal shutdown circuit.

Feature Summary

• Two-speed mode select function allowing full speed and low speed operation with minimal external components
• Built-in motor lock protection and automatic return circuit
• Output transistors with integrated Zener diodes for low-level noise protection
• Built-in thermal shutdown circuit and rotation detect function

Applications

• Driving two-phase unipolar DC brushless fan motors
• Variable speed fan control systems requiring lock protection
• Thermistor-controlled continuous variable-speed applications

Procurement Notes

Verify the specific suffix -TLM-H against official Sanyo Semicon Device documentation to confirm package type and tape/reel specifications. Ensure compatibility with the required 12 V or 24 V supply configuration by checking the external resistor requirements for the selected operating mode. Confirm that the 32 V Zener diode rating meets the system's noise protection needs.

Selection Notes

Select this component when driving two-phase unipolar DC brushless fans requiring integrated lock protection and thermal shutdown. Choose between 12 V or 24 V operation based on the system power supply and the appropriate external resistor value. The built-in Zener diodes provide necessary noise suppression for sensitive motor control circuits without additional external components.

Part Context

The LB1861M-TLM-H belongs to the LB1860 series of drivers designed for two-phase unipolar drive DC brushless fan motors. This series distinguishes itself through built-in protection features such as lock detection, restart logic, and thermal shutdown. The LB1861 variant specifically utilizes a 32 V Zener diode for output protection, differing from the LB1860 which uses a 57 V Zener diode.

Replacement Considerations

The LB1860M and LB1861M-TLM-E are part of the same series. Verify if the 57 V Zener diode in the LB1860M is acceptable for the application, as it differs from the 32 V rating in the LB1861M. Check pinout and functional compatibility before substitution.