L6611D

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Applications:	Programmable Housekeeping Controller
Voltage - Input:	--
Voltage - Supply:	4.2 V ~ 7 V
Current - Supply:	5mA
Operating Temperature:	0°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SO
Base Part Number:	L6611

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L6611D is a three-phase power MOSFET driver designed to control the speed and torque of three-phase brushless DC (BLDC) motors. It has integrated protections such as thermal shutdown and overcurrent protection, as well as an adjustable frequency range and dead time, making it an ideal solution for driving BLDC motors in a wide range of appliance and industrial applications. This paper will discuss the application fields and working principle of L6611D.

Application Fields

L6611D is suitable for driving a wide range of three-phase brushless DC motors. These motors are typically used in home appliances such as washing machines, dishwashers, and other motor-controlled products. In addition to the home market, L6611D is also well-suited for industrial applications such as servo motors, fans, pumps, and robotics.

Working Principle

The L6611D is a three-phase power MOSFET driver that uses one or two discrete supplies to control the speed and torque of three-phase BLDC motors. It consists of three main sections: a main section, three channels, and a protection section. The main section of the L6611D includes the master and slave synchronous logic, the oscillator circuit, and the motor control logic. The three channels are the dedicated drivers for the three phases of the motor and each is composed of one upper and one lower driver transistor. The protection section is designed to provide overload, thermal, and short-circuit protection. The L6611D works by generating a reference voltage waveform for the three motor phases, and then driving the three motor phases with the corresponding low-side MOSFETs. The reference waveform is generated by the master and slave synchronous logic and the oscillator circuit. Both of these circuits are driven by the motor control logic, which generates the velocity and torque of the motor by setting the frequency, dead time, and current limits. The L6611D also has protection features to ensure safe operation of the three-phase motor. It includes an over-current-protection (OCP) circuit, a thermal protection circuit, and a short circuit protection circuit. The OCP circuit is designed to reduce the current delivered to the motor when an over-current or over-temperature condition is detected. If the temperature of the L6611D exceeds a certain threshold, then the thermal protection circuit is triggered and the output is shut down. Finally, the short circuit protection circuit monitors the output voltage of each phase and shuts down the output voltage if any one of the phases is shorted.In conclusion, L6611D is a three-phase power MOSFET driver designed for driving three-phase brushless DC motors in appliance and industrial applications. It has integrated protections such as thermal shutdown and overcurrent protection, as well as an adjustable frequency range and dead time, making it an ideal solution for driving BLDC motors.

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