Posted: October 3rd, 2010 | Author: Tom Scarince | Filed under: Electronics, Motor Control | Tags: microcontroller, Neat Components, pic, Servo Motor, Stepper Motor | No Comments »
While many of the PIC microcontroller models have at least one hardware PWM output channel that could be used to control an h-bridge, we’ll take a quick look at several models that are particularly well suited for servo and stepper motor control applications.
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Posted: October 1st, 2010 | Author: Tom Scarince | Filed under: Motor Control, Stepper Motors | Tags: A3977, Neat Components, Stepper Motor | No Comments »
Configuration: Dual H-Bridge w/ microstepping translator
Applications: Stepper Motor
Current (peak): 2.5 amps
Voltage (max): 35V
Short circuit protection: No
Built-in chopper current limitation: Yes, Full and half stepping, 4 and 8 microsteps
Interface: Step and Direction
A3977 PCB
With dual h-bridges and a built-in translator, DAC and chopper circuits, the A3977 is a nearly complete microstepping stepper motor controller on a single chip. With the addition of a handful of external passive components, this IC is ready to accept step & direction signals from a pulse generator, microcontroller, indexer or CNC controller. Each pulse applied to the Step input rotates the motor one microstep forward or reverse, depending on the state of the Direction input.
Posted: September 17th, 2010 | Author: Tom Scarince | Filed under: Motor Control, Stepper Motors | Tags: Neat Components, Servo Motor, Stepper Motor | No Comments »
Configuration: Single H-Bridge
Applications: PM DC, Servo, Stepper
Current (continuous): 3 amps
Current (peak): 6 amps
Voltage (max): 60V
Short circuit protection: Yes
Built-in chopper current limitation: Yes, 4-bit linear DAC
Interface: Parallel
Datasheet: LMD18245
Thanks to its voltage and current capability, the LMD18245 is suitable for driving small PMDC servo motors or a medium size stepper motor winding. It incorporates a unique lossless current sense output. This chip also includes a 4-bit linear DAC to generate a reference voltage for the internal chopper circuit. When used in pairs, these chips can run a stepper motor at up to 8 microsteps per full step with reasonable accuracy. The LMD18200 is a similar IC that lacks the DAC and chopper circuit.
Posted: September 16th, 2010 | Author: Tom Scarince | Filed under: Motor Control | Tags: Neat Components, Servo Motor, Stepper Motor | No Comments »
Configuration: Single H-Bridge
Applications: PM DC, Servo, Stepper
Current (continuous): 3 amps
Current (peak): 6 amps
Voltage (max): 60V
Short circuit protection: Yes
Built-in chopper current limitation: No
Interface: Parallel
Datasheet: LMD18200
Thanks to its voltage and current capability, the LMD18200 is suitable for driving small PMDC sevo motors or a medium size stepper motor winding. It incorporates a unique lossless current sense output that can be used by an external circuit for chopper current control. The LMD18245 is a very similar part that adds a 4-bit linear DAC and built-in chopper circuit.