A3980 Allegro MicroSystems, Inc., A3980 Datasheet
A3980
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A3980 Summary of contents
Page 1
... The A3980 is a complete microstepping motor driver with built-in translator for easy operation designed to operate bipolar stepper motors in full-, half-, eighth-, and sixteenth-step modes and ±1 A. The A3980 includes a fi xed off-time current regulator which VBB1 has the ability to operate in slow, fast, or mixed decay modes. This ...
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... VCP OVLO VBB UVLO OVERTEMP OUT1A/1B SHORT SENSE OUT2A/2B OPEN SENSE SENSE1 SENSE2 REF FF1 FF2 PGND www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 C CS VBATT OUT1A OUT1B SENSE1 OUT2A OUT2B SENSE2 ...
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... O – t STPL – t STPH t MS1, MS2, DIR SU t MS1, MS2, DIR H – www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 = 3.0 to 5.5 V (unless otherwise noted Min. Typ. Max. Units 8 V OVB – < 1.0 20 – ...
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... OVBH V V falling UVR REG V V rising UVD DD – V UVDH × TripMAX www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 = 3.0 to 5.5 V (unless otherwise noted Min. Max. Units Typ. 700 950 1200 µs 0.60 V – DD – V ...
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... Sixteenth Step t STPH Table 2. Fault Report by Fault Flags FF1 FF2 www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 t STPL Fault UVLO, OVLO, Overtemperature, Open Load, or Shorted Load Short to Ground Short to Supply None 5 ...
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... Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 Phase 2 Phase 1 1/8 1/16 Step Current Current Step Step Angle [% I tripMax ] [% I tripMax ] # # (%) (%) (º –100.00 0.00 180.0 34 –99.52 –9.80 185.6 ...
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... Figure 7. Eighth Step 100.00 70.71 Phase 1 I OUT1B Direction = H (%) –70.71 –100.00 100.00 70.71 Phase 2 I OUT2B Direction = H (%) –70.71 –100.00 Figure 6. Half Step Mixed Slow Slow Mixed www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 Mixed Slow 7 ...
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... Slow Phase 2 9.8 I Mixed OUT2B 0.00 Direction = H –9.8 (%) –19.51 –29.03 –38.27 –47.14 –55.56 –63.44 –70.71 –77.30 –83.15 –88.19 –95.69 –100.00 Figure 8. Sixteenth Steps Mixed Slow Slow Mixed www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 Mixed Slow 8 ...
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... Home Microstep Position. At power-up, or after a UVLO (undervoltage lockout) condition caused by low voltage the translator in the A3980 resets the motor DD to the Home microstep position. This corresponds to the 45° position, which is the step where both phase currents are +70%. Referring to table 3, for full-step mode this is step 1, for half-step this is step 2, for eighth-step this is step 5, and for sixteenth-step this is step 9. In table 3 and fi ...
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... DMOS FETs, voltage regulator, and charge pump. A logic low on the SLEEP ter- minal puts the A3980 into Sleep mode. A logic high allows normal operation, as well as start-up (at which time the A3980 drives the motor to the Home microstep position). ...
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... Automotive DMOS Microstepping Driver with Translator mixed decay mode, as shown in fi gures 5 through 8. As the trip point is reached, the A3980 goes into fast decay mode until the voltage on the RC pin decays to the same level as the voltage applied to the PFD pin. The duration of time that the ...
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... If the main supply exceeds the overvoltage limit the fault fl ags are set and the A3980 enters a safety OVB mode in which all low-side DMOS FETs are enabled and all high-side DMOS FETs are disabled. This allows the A3980 to survive a load dump transient condition that has VBATT and a duration 500 ms ...
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... Automotive DMOS Microstepping Driver with Translator The A3980 is a power circuit, therefore careful consider- ation must be given to power dissipation and the effects of high currents on interconnect and supply wiring. Power Dissipation. A fi rst order approximation of the power dissipation in the A3980 can be determined by examining the power dissipation in each of the two full-bridges during each of the operation modes ...
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... A3980 should be soldered directly onto the board. The load supply terminal electrolytic capacitor (> 47 µF is recommended), placed as close to the A3980 as possible. To avoid problems due to capacitive coupling of the high dv/dt switching transients, route the full-bridge output traces away from the sensitive logic input traces ...
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... I of 0.5 A. Below 0.5 A, TripMAX R should be 1 Ω, and V reduced accordingly, as shown S REF in the following table. Recommended I (A) MAX R (Ω) S 0.1 1.00 0.2 1.00 0.3 1.00 0.4 1.00 0.5 1.00 0.6 0.83 0.7 0.71 0.8 0.63 0.9 0.56 1.0 0.50 ) should have an (Ω), (V) REF 0.8 1.6 2.4 3.2 4.0 4.0 4.0 4.0 4.0 4.0 www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 15 ...
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... CP1 Charge pump capacitor 1 CP2 Charge pump capacitor 2 OUT1B Output B for for full-bridge 1 ENABLE Logic input SLEEP Logic input VBB1 Load supply 1 www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 Number ...
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... Automotive DMOS Microstepping Driver with Translator A3980 28-Pin TSSOP with Exposed Thermal Pad 9.8 .386 9.6 .378 28 4.5 .177 4.3 .169 A 6.6 .260 6.2 .244 5 .200 1 2 BSC 0.30 .012 0.19 .007 0.65 .026 BSC Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only A Exposed thermal pad (bottom surface) NOTES: 1. Exact body and lead confi ...
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... 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©2003, 2004 AllegroMicrosystems, Inc. www.allegromicro.com 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 A3980 18 ...