ML4421

The ML4421 has the following features including Drives Single and Two phase AC motors;10:1 Variable speed control range;Constant V/F with programmable ratio;Forward/Reverse for 2 phase drive;Optional Slip angle control;PWM sine wave drive;Eliminates run capacitor for PSC motors;On-board low side drivers;Drives IR 2118 high side drivers;Shoot through protection and current limit 12V Operation;On-board 8V voltage reference;28-pin DIP Narrow and SOIC package.

The ML4421 AC induction motor controller provides the PWM Sin 0° and Sin 90° waveforms necessary for controlling single and two phase AC induction motors.A constant Voltage/Frequency ratio is maintained over a 10:1 RPM range. The output variable frequency AC voltages of ML4421 are sampled and fed back to the controller to track the sine wave frequency and amplitude set by the speed control.Direction, on two phase motors, is controlled by changing the relative 90° phase difference between the main and secondary motor winding.For tighter speed control, the slip angle () can be sensed by measuring the phase angle of the current vs. the voltage in the main winding of the motor. The resultant error signal is used to adjust the amplitude of the output Sin 0° and Sin 90° signals in order to maintain a constant speed during changes in motor load.The ML4421 limits the motor winding current with a constant off-time PWM controlled current limit. Additional circuitry of ML4421 protects the power transistors by preventing shoot through.

Absolute maximum ratings of ML4421 are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.The information given herein, including the specifications and dimensions, is subject to change without prior notice to improve product characteristics. Before ordering, purchasers are advised to contact the Sensitron Semiconductor sales department for the latest version of the datasheet(s).In cases where extremely high reliability is required.

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