PDF A4983 Data sheet ( Hoja de datos )

Número de pieza	A4983
Descripción	DMOS Microstepping Driver
Fabricantes	Allegro MicroSystems
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No Preview Available ! www.DataSheet4U.com A4983 DMOS Microstepping Driver with Translator Features and Benefits ▪ Low RDS(ON) outputs ▪ Automatic current decay mode detection/selection ▪ Mixed and Slow current decay modes ▪ Synchronous rectification for low power dissipation ▪ Internal UVLO ▪ Crossover-current protection ▪ 3.3 and 5 V compatible logic supply ▪ Very thin profile QFN package ▪ Thermal shutdown circuitry Package: 28-pin QFN (suffix ET) Description The A4983 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A4983 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes. The translator is the key to the easy implementation of the A4983. Simply inputting one pulse on the STEP input drives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A4983 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. The chopping control in the A4983 automatically selects the current decay mode (Slow or Mixed). When a signal occurs at the STEP input pin, the A4983 determines if that step results in a higher or lower current in each of the motor phases. If the change is to a higher current, then the decay mode is set to Slow decay. If the change is to a lower current, then the current decay is set to Mixed (set initially to a fast decay for a period amounting to 31.25% of the fixed off-time, then to a Approximate size Continued on the next page… Typical Application Diagram Microcontroller or Controller Logic VDD 0.22 μF 0.1 μF VREG VCP CP1 CP2 VDD VBB VBB MS1 MS2 MS3 A4983 OUT1A OUT1B RS1 SLEEP STEP DIR RESET ENABLE OUT2A OUT2B RS2 REF ROSC 0.1 μF VBB 4983DS 1 page A4983 DMOS Microstepping Driver with Translator THERMAL CHARACTERISTICS may require derating at maximum conditions Characteristic Symbol Test Conditions* Package Thermal Resistance RθJA Package ET; 4-layer PCB, based on JEDEC standard *In still air. Additional thermal information available on Allegro Web site. Value Units 32 ºC/W 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 20 Maximum Power Dissipation, PD(max) (R θJA = 32 ºC/W) 40 60 80 100 120 140 160 180 Temperature (°C) Allegro MicroSystems, Inc. 5 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 5 Page A4983 DMOS Microstepping Driver with Translator STEP 100.00 70.71 Phase 1 IOUT1A Direction = H (%) 0.00 –70.71 –100.00 100.00 70.71 Phase 2 IOUT2A Direction = H (%) 0.00 –70.71 –100.00 Slow Slow STEP 100.00 70.71 Phase 1 IOUT1A Direction = H (%) 0.00 Slow Slow Slow Mixed Mixed Mixed –70.71 –100.00 100.00 70.71 Phase 2 IOUT2B Direction = H (%) 0.00 Slow Slow Mixed Mixed Slow Mixed Slow –70.71 –100.00 Figure 2. Decay Mode for Full-Step Increments Figure 3. Decay Modes for Half-Step Increments STEP 100.00 92.39 70.71 Phase 1 IOUT1A Direction = H (%) 38.27 0.00 –38.27 –70.71 –92.39 –100.00 100.00 92.39 70.71 Phase 2 IOUT2B Direction = H (%) 38.27 0.00 –38.27 –70.71 –92.39 –100.00 Slow Slow Mixed Mixed Slow Figure 4. Decay Modes for Quarter-Step Increments Slow Mixed Mixed Slow Slow Mixed Allegro MicroSystems, Inc. 11 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 11 Page

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