UCC3626

The UCC3626 motor controller IC combines many of the functions required to design a high performance, two or four quadrant, 3-phase,
brushless DC motor controller into one package. Rotor position inputs are decoded to provide six outputs that control an external power stage. A precision triangle oscillator and latched comparator provide PWM motor control in either voltage or current mode configurations. The oscillator is easily synchronized to an external master clock source via the SYNCH input. Additionally, a QUAD select input configures the chip to modulate either the low side switches only, or both upper and lower switches, allowing the user to minimize switching losses in less demanding two quadrant applications.

The chip includes a differential current sense amplifier and absolute value circuit which provide an accurate reconstruction of motor current,
useful for pulse by pulse over current protection as well as closing a current control loop. A precision tachometer is also provided for implementing closed loop speed control. The TACH_OUT signal is a variable duty cycle, frequency output which can be used directly for digital control or filtered to provide an analog feedback signal. Other features include COAST, BRAKE, and DIR_IN commands along with a direction output, DIR_OUT.