LM18293 datasheet(5/6 Pages) NSC

5 / 6 page

Bipolar Stepping Motor Control

Step Sequencing Tables

Full Step

VIN 1VIN 2

Step

VE 1 and VE 2 e H

Half Step

VE 1VE 2VIN 1VIN 2

Step

H e High

L e Low

X e Don’t care

Mounting Instructions

The junction to ambient thermal resistance of the LM18293

can be reduced by soldering the ground pins to a suitable

copper area of the printed circuit board or to an external

heatsink The graph below which shows the maximum pow-

er dissipated and junction to ambient thermal resistance as

a function of the side ‘‘l’’ of two equal square copper areas

having a thickness of 35m illustrates this In addition it is

possible to use an external heatsink (see illustration below)

During soldering the pins temperature must not exceed

230 C and the soldering time must not be longer than 12

seconds The external heatsink or printed circuit copper

area must be connected to electrical ground

Staver External Heat-sink

TLH8706 – 10

Motor Control Block Diagram

TLH8706 – 7

TLH8706 – 8

Maximum power dissipated

and junction to ambient

thermal resistance vs size

TLH8706 – 9

LM18293 Datasheet(PDF) 5 Page - National Semiconductor (TI)