A4989SLDTR-T Allegro Microsystems Inc, A4989SLDTR-T Datasheet
A4989SLDTR-T
Specifications of A4989SLDTR-T
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A4989SLDTR-T Summary of contents
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Features and Benefits ▪ 2-wire step and direction interface ▪ Dual full-bridge gate drive for N-channel MOSFETs ▪ Operation over supply voltage range ▪ Synchronous rectification ▪ Cross-conduction protection ▪ Adjustable mixed decay ▪ Integrated sinusoidal ...
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... MOSFETs is provided by a bootstrap capacitor. Efficiency is enhanced by using synchronous rectification and the power FETs are protected from shoot-through by integrated crossover control and programmable dead time. Selection Guide Part Number A4989SLDTR-T Tape and reel, 4000 pieces per reel Absolute Maximum Ratings Characteristic Supply Voltage Logic Supply Voltage ...
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A4989 +5 V VDD Bandgap V REF REF STEP DIR MS1 MS2 Translator PFD1 PFD2 ENABLE RESET SR OSC V ROSC Protection UVLO TSD Dual Full-Bridge MOSFET Driver with Microstepping Translator Functional Block Diagram VBB Regulator V REG Phase 1A ...
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A4989 ELECTRICAL CHARACTERISTICS at T Characteristics Supply and Reference Load Supply Voltage Range Load Supply Current Load Supply Idle Current Logic Supply Voltage Range Logic Supply Current Logic Supply Idle Current Regulator Output Bootstrap Diode Forward Voltage Gate Output Drive ...
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A4989 ELECTRICAL CHARACTERISTICS (continued Characteristics Current Control Blank Time Fixed Off-Time Reference Input Voltage Internal Reference Voltage Current Trip Point Error 3 1 Reference Input Current Oscillator Frequency Protection VREG Undervoltage Lockout VREG Undervoltage Lockout Hysteresis VDD Undervoltage ...
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A4989 RESET STEP MSx, DIR Figure 1. Logic Interface Timing Diagram Table 1. Microstep Resolution Truth Table MS2 MS1 Microstep Resolution 0 0 Full Step 0 1 Half Step 1 0 Quarter Step 1 1 Sixteenth Step Table 2. Mixed ...
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A4989 Table 3. Step Sequencing Settings Home microstep position at Step Angle 45º; DIR = H Full Half 1/4 1/16 Phase 2 Step Step Step Step Current (#) (#) (#) (#) (% I TRIP(max 18.75 ...
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A4989 STEP 100 71 I (%*) OUT1B Phase = 1, 0 Direction = H –71 –100 100 71 I (%*) OUT2B Phase = 2, 0 Direction = H –71 –100 *For precise definition of output levels, refer to table 3 ...
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A4989 STEP 100 (%*) 10 OUT1B Phase = 1, 0 Direction = H –10 –20 –29 –38 –47 –56 –63 –71 –77 –83 –88 –96 –100 100 96 ...
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A4989 Basic Operation The A4989 is a complete microstepping FET driver with built-in translator for easy operation with a minimum number of control inputs designed to operate 2-phase bipolar stepper motors in full-, half-, quarter, and sixteenth-step modes. ...
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A4989 C1A, C1B, C2A, and C2B High-side connections for the bootstrap capacitors, CBOOTx, and positive supply for high- side gate drivers. The bootstrap capacitors are charged to approximately V when the associated output Sxx terminal REG is low. When the ...
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A4989 in the phase to a desired value, I TRIP of source and sink MOSFETs are enabled and current flows through the motor winding and the current sense resistor, RSENSEx. When the voltage across RSENSEx equals the DAC output voltage, ...
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A4989 motors having low values of DC phase resistance, the minimum current that can be controlled can be higher than the target value required in some microstepping modes. Errors in the average current amplitude delivered to the phases of a ...
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A4989 The Percent Fast Decay pins are used to PFD1 and PFD2 select the portion of fast decay, according to table used when mixed decay is enabled. Mixed decay is enabled when a STEP input signal commands ...
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A4989 Current Sensing To minimize inaccuracies in sensing the I level caused by ground-trace IR drops, the sense resistor, RSENSEx, should have an independent return to the supply ground star point. For low-value sense resistors, the IR drops in the ...
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A4989 Pin-out Diagram Terminal List Table Number ...
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A4989 9.70 ±0. 38X 0.10 C 0.22 ±0.05 0.50 Copyright ©2010-2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ...