LCDA257F Two-phase 57 Closed-loop Stepper Driver

Product Overview

The LCDA257F uses the latest dedicated motor control DSP chip and vector closed-loop control technology, completely overcoming the problem of step loss in open-loop stepper motors. At the same time, it significantly improves the motor's high-speed performance, reduces motor heating and vibration, enhances machine processing speed and precision, and lowers machine power consumption. This driver is compatible with two-phase 57-type closed-loop stepper motors, facilitating upgrades from traditional stepper drive solutions and greatly reducing costs.

Features

Voltage input range: DC 20V~50V (recommended above 36V) Maximum peak current: 6A Subdivision range: 400-51200 Pulse form: Pulse + direction, CW/CCW (set via software) Pulse response frequency: 0~200kHz Logic input current: 10~20mA Servo control mode, very low noise during motor operation

Product Overview Supporting Products Data Download

Main Parameter Description

(1) Electrical Specifications

Parameter	LCDA257F
Parameter	Minimum Value	Typical Value	Maximum Value	Unit
Maximum Peak Current	-	-	6	A
Input Power Voltage	20	36	50	VDC
Logic Input Current	7	10	20	mA
Pulse Frequency	-	-	200	KHZ

Product Diagram

Driver Terminal Description

(1) Power Terminal Definition

Symbol	Name	Description
A+	Positive end of phase A motor winding	-
A-	Negative end of phase A motor winding	-
B+	Positive end of phase B motor winding	-
B-	Negative end of phase B motor winding	-
+VDC	Power supply positive input	+20V~+50V
GND	Power supply negative input	0V

(2) Driver Encoder Terminal Definition

Symbol	Color	Description
EB+	Yellow	Motor encoder phase B positive input
EB-	Green	Motor encoder phase B negative input
EA+	Black	Motor encoder phase A positive input
EA-	Blue	Motor encoder phase A positive and negative input
VCC	Red	Encoder +5V input
EGND	White	Encoder power ground

(3) Control Signal Ports

Name	Description
PUL+	Pulse input signal: pulse active edge adjustable, default pulse rising edge active; to reliably respond to pulse signals, pulse width should be greater than 2.5μs. When using +12V or +24V, a 1.5K resistor must be connected in series.
PUL-
DIR+	Direction input signal: switch motor direction through high / and low level signals, direction signal should be established at least 5 μ s before pulse signal; when using +12V or +24V a 1.5 K resistor must be connected in series.
DIR-
ENA+	Enable control signal: this input signal is used to enable or disable driver output. When this function is not needed, leave the enable signal terminal floating. When using +12V or +24V, a 1.5K resistor must be connected in series.
ENA-
ALM+	Alarm output positive terminal
ALM-	Alarm output negative terminal

Microstep subdivision setting

Pulse / rev	SW1	SW2	SW3	SW4
Default	on	on	on	on
800	off	on	on	on
1600	on	off	on	on
3200	off	off	on	on
6400	on	on	off	on
12800	off	on	off	on
25600	on	off	off	on
51200	off	off	off	on
1000	on	on	on	off
2000	off	on	on	off
4000	on	off	on	off
5000	off	off	on	off
8000	on	on	off	off
10000	off	on	off	off
20000	on	off	off	off
40000	off	off	off	off

DIP Switch Settings
The current of this series of drivers is auto-tuned, so manual current setting is not required. The DIP switch functions are as follows:

SW1~SW4: Microstep subdivision setting	SW5: Motor forward/reverse direction selection
SW6: Current auto-tuning mode switch	SW7: Closed-loop/open-loop mode switch selection
SW8: Pulse edge selection

Main Application Areas

Suitable for various motion control automation equipment and instruments, such as: electronic processing and inspection, semiconductor packaging, laser cutting and welding, laser typesetting, packaging machinery, engraving machines, marking machines, cutting machines, garment plotters, CNC machine tools, automated assembly equipment, etc.

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