By Geoff Williams
Textual content presents step by step, illustrated instructions for designing, developing, and trying out a completely practical desktop numerical regulate (CNC) robotic. contains time-saving information, tips, and pictoral aid alongside the way in which. Softcover.
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L c o 0----iPiii ~ 0 ~ _ _ 7/18 52 r- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Chapter 2 / Electr onics APP LICATION NOTE Fig ure 12 : State Sequence and Output Waveforms for Walle Drive (one phase on). These are inhibit signals which are coupled to the 1298N's enable inputs and serve to speedthe current decay when a winding is switched off. Since both windings are energized continuouslyin two-phase-onfull step mode no winding is everswitched off and these signals are not generated.
These signals, which co nnect direct ly to the L29 8's enabl e inputs, are intended to spe ed current deca y when a wi nding is de-energised. W hen th e L297 is used to drive a unipo lar motor the chopper acts on these lines. An input ca lled CO NTROL determ ines whethe r the chopper will act on the phase lines ABCD or the inhibit lines INH1 and INH2. When th e phase lines max DIP20 80 SOlO Unit 100 oem are cho ppe d the non-active p hase line of each pair (AB or CD) is activated(rather than inte rrupting the line the n active).
ENABl£ , " use N- err , ~ • "''' 11:::= N. " " ~ • t::l ~~. -- .. 1 L. 1. POWER OUTPUT STAGE Each input must be connected to the source af the TheL298i ntegratestwopoweroutputstages(A; B). The pow er output stage is a bridge conf iguration driving signals by means of a very short path. Turn-On and Turn-Off : Before to Tum -ONthe Supply Voltageand beforeto TurnitOFF,the Enableinput must be dr iven to the Low state. and its outputs can drive an inductive load in comma n or differenzialmode, dependingon the state of the inputs.