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: 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.