Cnc Casera
Páginas: 4 (760 palabras)
Publicado: 8 de marzo de 2013
A4988 DMOS Microstepping Driver with Translator And Overcurrent Protection
Features and Benefits
▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Low RDS(ON) outputs Automatic current decay mode detection/selection Mixed andSlow current decay modes Synchronous rectification for low power dissipation Internal UVLO Crossover-current protection 3.3 and 5 V compatible logic supply Thermal shutdown circuitry Short-to-groundprotection Shorted load protection Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16
Description
The A4988 is a complete microstepping motor driver with built-in translator for easyoperation. 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 A4988 includes a fixedoff-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 A4988. Simply inputting one pulse on the STEP inputdrives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A4988 interface is an ideal fit for applications where a complexmicroprocessor is unavailable or is overburdened. During stepping operation, the chopping control in the A4988 automatically selects the current decay mode, Slow or Mixed. In Mixed decay mode, thedevice is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time. Mixed decay current control results in reduced audible motor noise,increased step accuracy, and reduced power dissipation.
Package:
with exposed thermal pad
5 mm × 5 mm × 0.90 mm (ET package) 28-contact QFN
Approximate size
Continued on the next page…Typical Application Diagram
VDD 0.22 μF VREG ROSC VDD 5 kΩ Microcontroller or Controller Logic SLEEP STEP MS1 MS2 MS3 DIR ENABLE RESET VREF GND GND OUT2A OUT2B SENSE2 CP1 CP2 VCP 0.1 μF 0.1 μF...
Features and Benefits
▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Low RDS(ON) outputs Automatic current decay mode detection/selection Mixed andSlow current decay modes Synchronous rectification for low power dissipation Internal UVLO Crossover-current protection 3.3 and 5 V compatible logic supply Thermal shutdown circuitry Short-to-groundprotection Shorted load protection Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16
Description
The A4988 is a complete microstepping motor driver with built-in translator for easyoperation. 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 A4988 includes a fixedoff-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 A4988. Simply inputting one pulse on the STEP inputdrives the motor one microstep. There are no phase sequence tables, high frequency control lines, or complex interfaces to program. The A4988 interface is an ideal fit for applications where a complexmicroprocessor is unavailable or is overburdened. During stepping operation, the chopping control in the A4988 automatically selects the current decay mode, Slow or Mixed. In Mixed decay mode, thedevice is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time. Mixed decay current control results in reduced audible motor noise,increased step accuracy, and reduced power dissipation.
Package:
with exposed thermal pad
5 mm × 5 mm × 0.90 mm (ET package) 28-contact QFN
Approximate size
Continued on the next page…Typical Application Diagram
VDD 0.22 μF VREG ROSC VDD 5 kΩ Microcontroller or Controller Logic SLEEP STEP MS1 MS2 MS3 DIR ENABLE RESET VREF GND GND OUT2A OUT2B SENSE2 CP1 CP2 VCP 0.1 μF 0.1 μF...
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