A3982 Allegro MicroSystems, Inc., A3982 Datasheet
A3982
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A3982 Summary of contents
Page 1
... The chopping control in the A3982 automatically selects the current decay mode (Slow or Mixed). When a signal occurs at the STEP input STEP pin, the A3982 determines if that step results in a higher or lower VDD current in each of the motor phases. If the change higher current, ROSC then the decay mode is set to Slow decay ...
Page 2
... V REF 26184.28B DMOS Stepper Motor Driver with Translator Functional Block Diagram 0.1 μF 0.22 μF CP1 ROSC Charge OSC Pump DMOS Full Bridge Gate Drive DMOS Full Bridge A3982 CP2 VCP 0.1 μF VBB1 OUT1A OUT1B SENSE1 R S1 VBB2 OUT2A OUT2B SENSE2 R S2 Allegro MicroSystems, Inc. ...
Page 3
... 70.71% %I REF TripMAX err 100.00% %I REF TripMAX JHYS UV V rising HYS × TripMAX A3982 2 Min. Max. Units Typ. 8 – 3.0 – 5.5 V – 0.370 0.460 Ω – 0.330 0.380 Ω – – 1.2 V – – 1.2 V – – ...
Page 4
... High-K PCB (multilayer with significant copper areas, based on JEDEC standard) Power Dissipation versus Ambient Temperature 100 120 Temperature, T (°C) A A3982 Value Units 140 160 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ºC/W º ...
Page 5
... C D Time Duration Symbol MS1 Step Resolution Excitation Mode L Full Step 2 Phase H Half Step 1-2 Phase A3982 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 5 ...
Page 6
... The A3982 is a complete stepper Device Operation. motor driver with a built-in translator for easy operation with minimal control lines designed to operate bipolar stepper motors in full- and half-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 circuitry ...
Page 7
... ENABLE input state. Shutdown. (excess undervoltage (on VCP), the DMOS out- J puts of the A3982 are disabled until the fault condition is removed. At power-on, the UVLO (undervoltage lockout) circuit disables the DMOS outputs and resets the translator to the Home state. Mixed Decay Operation. ...
Page 8
... I tripMax ] [% I tripMax ] # # (%) (%) 1 100.00 0. 70.71 70.71 3 0.00 100. –70.71 70.71 5 –100.00 0. –70.71 –70.71 7 0.00 –100. 70.71 –70.71 A3982 100.00 70.71 Slow Slow Slow Mixed Mixed 0.00 (%) –70.71 –100.00 100.00 70.71 Slow Slow Slow Mixed Mixed Mixed 0.00 (%) –70.71 –100.00 Step Angle (º) 0.0 45.0 90.0 135.0 180.0 225.0 270.0 315.0 Allegro MicroSystems, Inc ...
Page 9
... Logic input Logic input Timing set Logic supply Logic input Current trip reference voltage input Power ground Power ground Logic input DMOS Full Bridge 1 Output B Load supply Sense resistor for Bridge 1 DMOS Full Bridge 1 Output A A3982 Number ...
Page 10
... DMOS Stepper Motor Driver with Translator LB Package, 24-Pin Wide Body SOIC Copyright©2005 AllegroMicrosystems, Inc. A3982 10 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ...