PDF A5985 Data sheet ( Hoja de datos )

Número de pieza	A5985
Descripción	DMOS Microstepping Driver
Fabricantes	Allegro
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No Preview Available ! A5985 DMOS Microstepping Driver with Translator and Overcurrent Protection FEATURES AND BENEFITS • Drop-in replacement for A4988 • Proprietary Adaptive Percent Fast Decay option • Low RDS(on) outputs • Single supply • Microstepping up to 32 microsteps per full step • Full torque step modes • Short-to-ground protection • Shorted load protection • Short-to-battery protection • Fault output • Low current Sleep mode, < 10 µA • Thin profile QFN • Thermal shutdown circuitry • Synchronous rectification for low power dissipation • Internal UVLO • Crossover-current protection APPLICATIONS • Video Security Cameras • Printers • Scanners • Robotics • ATM • POS DESCRIPTION The A5985 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to operate bipolar stepper motors from full-step up to 1/32 step modes. Step modes are selectable by MSx logic inputs. It has an output drive capacity of up to 40 V and ±2 A. A5985 introduces a proprietary Adaptive Percent Fast Decay (APFD) algorithm to optimize the current waveform over a wide range of stepper speeds and stepper motor characteristics. APFD adjusts on-the-fly the amount of fast decay during a PWM cycle to keep current ripple at a low level over the various operating conditions. This adaptive feature improves performance of the system resulting in reduced audible motor noise, reduced vibration, and increased step accuracy. The translator is the key to the easy implementation of the A5985. 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 A5985 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and crossover-current protection. Special power-on sequencing is not required. Continued on the next page… Microcontroller or Controller Logic 5985-DS 5V 5 kΩ 5V 5 kΩ 0.1 µF 0.1 µF SLEEP ROSC CP1 CP2 VCP VBB1 STEP MS1 MS2 MS3 DIR ENABLE RESET VREF nFAULT A5985 VBB2 OUT1A OUT1B SENSE1 GND OUT2A PAD OUT2B SENSE2 Typical Application Diagram 100 µF 1 page A5985 DMOS Microstepping Driver with Translator And Overcurrent Protection Pin-Out Diagram OUT2B ENABLE GND CP1 CP2 VCP NC 1 2 3 4 5 6 7 PAD 21 OUT1B 20 NC 19 DIR 18 GND 17 REF 16 STEP 15 MS3 Terminal List Table Name Number Description CP1 4 Charge pump capacitor terminal CP2 5 Charge pump capacitor terminal DIR ¯E¯ ¯N¯ ¯A¯ ¯B¯ ¯L¯ ¯E¯ 19 Logic input 2 Logic input GND 3, 18 Ground* MS1 9 Logic input MS2 10 Logic input MS3 15 Logic input NC 7, 11, 20, 25 No connection nFAULT 8 Logic output OUT1A 24 DMOS Full Bridge 1 Output A OUT1B 21 DMOS Full Bridge 1 Output B OUT2A 26 DMOS Full Bridge 2 Output A OUT2B 1 DMOS Full Bridge 2 Output B REF 17 Gm reference voltage input ¯R¯ ¯E¯ ¯S¯ ¯E¯ ¯T¯ 12 Logic input ROSC 13 Timing set SENSE1 23 Sense resistor terminal for Bridge 1 SENSE2 ¯S¯ ¯L¯ ¯E¯ ¯E¯ ¯P¯ 27 Sense resistor terminal for Bridge 2 14 Logic input STEP 16 Logic input VBB1 22 Load supply VBB2 28 Load supply VCP 6 Reservoir capacitor terminal PAD – Exposed pad for enhanced thermal dissipation* *The GND pins must be tied together externally by connecting to the PAD ground plane under the device. Allegro MicroSystems, LLC 5 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 5 Page A5985 DMOS Microstepping Driver with Translator And Overcurrent Protection Slow Mixed Decay Decay Slow Mixed Decay Decay Slow Decay Mixed Decay Slow Mixed Decay Decay Missed Step Step input 10 V/div. t → , 1 s/div. Figure 3: Missed Steps in Low-Speed Microstepping ILOAD 500 mA/div. Mixed Decay No Missed Steps Step input 10 V/div. t → , 1 s/div. Figure 4: Continuous Stepping Using APFD (ROSC Pin Grounded) Allegro MicroSystems, LLC 11 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com 11 Page

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