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UCC3626 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3626 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 15 page UCC2626 UCC3626 PRELIMINARY 04/99 FEATURES • Two Quadrant and Four Quadrant Operation • Integrated Absolute Value Current Amplifier • Pulse-by-Pulse and Average Current Sensing • Accurate, Variable Duty Cycle Tachometer Output • Trimmed Precision Reference • Precision Oscillator • Direction Output Brushless DC Motor Controller 17 HALLC 8 DIR_OUT 14 PWM_NI 13 PWM_I 16 HALLB SYNCH 11 OC_REF 9 SNS_I 3 4 1 5 22 CLOW C_TACH R_TACH TACH_OUT GND 2VREF 27 AHI 25 BHI 23 CHI 26 ALOW 10 SNS_NI IOUT 7 6 12 CT 18 COAST 21 DIR_IN 15 HALLA 19 BRAKE 20 QUAD SENSE AMPLIFIER OVER-CURRENT COMPARATOR OSCILLATOR DIRECTION DETECTOR EDGE DETECTOR 28 VDD ONE SHOT R•C 5VOLT REFERENCE Q Q S R PWM LOGIC 24 BLOW 1.75V DIRECTION SELECT HALL DECODER PWM COMPARATOR X5 Q Q S R BLOCK DIAGRAM UDG-97173 DESCRIPTION The UCC3626 motor controller IC combines many of the functions re- quired 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 mo- tor control in either voltage or current mode configurations. The oscilla- tor 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 de- manding 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 imple- menting closed loop speed control. The TACH_OUT signal is a variable duty cycle, frequency output which can be used directly for digital con- trol or filtered to provide an analog feedback signal. Other features in- clude COAST, BRAKE, and DIR_IN commands along with a direction output, DIR_OUT. application INFO available |
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