UCC3626 Datasheet | Texas Instruments

UCC2626, UCC3626 SLUS318B - APRIL 1999 - REVISED JANUARY 2002 BRUSHLESS DC MOTOR CONTROLLER Features D Two-Quadrant and Four-Quadrant Operation D Integrated Absolute Value Current Amplifier D Pulse-by-Pulse and Average Current Sensing D Accurate, Variable Duty-Cycle Tachometer Output D Trimmed Precision Reference D Precision Oscillator D Direction Output DESCRIPTION The UCC3626 motor controller device bines many of the functions required to design a high-performance, two- or four-quadrant, threephase, 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 parator 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 device includes a differential current-sense amplifier and absolute-value circuit which provide an accurate reconstruction of motor current, useful for pulse-by-pulse overcurrent 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 mands, along with a direction output, DIR_OUT. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. .ti. Copyright  2002, Texas Instruments Incorporated 1 UCC2626,...