A3984 Allegro MicroSystems, Inc., A3984 Datasheet
A3984
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A3984 Summary of contents
Page 1
... The A3984 is a complete microstepping motor driver with built-in translator for easy operation designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-step modes, with an output drive capacity and ±2 A. The A3984 includes a fixed off- GND time current regulator which has the ability to operate in Slow or Mixed decay modes ...
Page 2
... DAC V REF 26184.30A DMOS Microstepping Driver with Translator Functional Block Diagram 0.1 uF 0.22 uF CP1 ROSC Charge OSC Pump DMOS Full Bridge Gate Drive DMOS Full Bridge A3984 CP2 VCP 0.1 uF VBB1 OUT1A OUT1B SENSE1 R S1 VBB2 OUT2A OUT2B SENSE2 R S2 Allegro MicroSystems, Inc. ...
Page 3
... TripMAX 70.71% err %I I REF TripMAX 100.00% %I REF TripMAX JHYS UV V rising HYS × TripMAX A3984 2 Min. Typ. Max. Units 8 – – 3.0 – 5.5 V – 0.350 0.450 Ω – 0.300 0.370 Ω – – 1.2 V – – ...
Page 4
... High-K PCB (multilayer with significant copper areas, based on JEDEC standard) Maximum Power Dissipation 100 120 Temperature (°C) A3984 Value Units D(max) 140 160 180 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 100 º ...
Page 5
... D MS2 Microstep Resolution Excitation Mode L Full Step 2 Phase L Half Step 1-2 Phase H Quarter Step W1-2 Phase H Sixteenth Step 4W1-2 Phase A3984 t B Typ. Unit 1 μs 1 μs 200 ns 200 ns Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ...
Page 6
... The A3984 is a complete microstep- Device Operation. ping motor driver with a built-in translator for easy operation with minimal control lines designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth-step modes. The currents in each of the two output full-bridges and all of the N-channel DMOS FETs are regulated with fixed off-time PMW (pulse width modulated) control cir- cuitry ...
Page 7
... Step command. Mixed Decay Operation. Mixed Decay mode, depending on the step sequence, as shown in figures 3 thru 5. As the trip point is reached, the A3984 initially goes into a fast decay mode for 31.25% of the off-time. t for the remainder of t Synchronous Rectification is triggered by an internal fixed– ...
Page 8
... DMOS Microstepping Driver with Translator STEP Slow Phase 1 I OUT1A Direction = H Phase 2 I OUT2B Direction = H Slow Figure 3. Decay Modes for Half-Step Increments Slow Mixed Slow Slow Mixed Slow Mixed A3984 100.00 70.71 Slow Slow Slow Mixed Mixed Mixed 0.00 (%) –70.71 –100.00 100.00 70.71 Slow Slow Slow Mixed Mixed Mixed 0 ...
Page 9
... Figure 5. Decay Modes for Sixteenth-Step Increments 26184.30A DMOS Microstepping Driver with Translator Slow Mixed Slow A3984 Slow Mixed Mixed Slow Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 9 ...
Page 10
... A3984 Phase 2 Phase 1 1/4 1/16 Current Current Step Step [% I tripMax ] Angle [% I tripMax ] # # (%) (%) 9 33 –100.00 0.00 180.0 34 –99.52 –9.80 185.6 35 –98.08 –19.51 191.3 36 –95.69 –29.03 196 –92.39 –38.27 202 ...
Page 11
... Ground* Logic input DMOS Full Bridge 1 Output B Load supply Sense resistor for Bridge 1 DMOS Full Bridge 1 Output A DMOS Full Bridge 2 Output A Sense resistor for Bridge 2 Load supply DMOS Full Bridge 2 Output B Logic input Ground* A3984 Number ...
Page 12
... LP Package, 24-Pin TSSOP with Exposed Thermal Pad 26184.30A DMOS Microstepping Driver with Translator A3984 12 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ...
Page 13
... How ev er, Allegro MicroSystems, Inc. assumes no re spon - si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. Copyright©2005 AllegroMicrosystems, Inc. A3984 13 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www ...