s lus403a - february 2000 block diagram ? full-step, half-step and micro-step capability. ? bipolar output current up to 2a. ? wide range of motor supply voltage: 10?50v ? low saturation voltage ? wide range of current control: 5ma?2a. ? current levels selected in steps or varied continuously. ? thermal protection and soft intervention. the uc3770a and uc3770b are high-performance full bridge driv - ers that offer higher current and lower saturation voltage than the uc3717 and the uc3770. included in these devices are ls-ttl compatible logic inputs, current sense, monostable, thermal shut - down, and a p ower h-bridge output stage. two uc3770as or uc3770bs and a few external components form a complete micro - processor-controllable stepper motor power system. unlike the uc3717, the uc3770a and the uc3770b require exter - nal high-side clamp diodes. the uc3770a and uc3770b are identical in all regards except for the current sense thresholds. thresholds for the uc3770a are identical to those of the older uc3717 permitting drop-in replacement in applications where high-side diodes are not required. thresholds for the uc3770b are tailored for half stepping applications where 50%, 71%, and 100% current levels are desirable. the uc3770a and uc3770b are specified for operation from 0 c to 70 c ambient. uc3770a uc3770b high performance stepper motor drive circuit features description udg-92039-1
2 connection diagrams uc3770a uc3770b uc3770a uc3770b parameter test conditions min typ max min typ max units supply voltage v m (pins 3, 14) 10 45 10 45 v logic supply voltage v cc (pin 6) 4.75 5 5.3 4.75 5 5.3 v logic supply current i cc (pin 6) i o = i 1 = h, i m = 0 15 25 15 25 ma i o = i 1 = l, i m = 0 18 28 18 28 ma i o = i 1 = h, i m = 1.3a 33 40 33 40 ma thermal shutdown temperature +170 +170 c logic threshold (pins 7, 8, 9) 0.8 2.0 0.8 2.0 v input current low (pin 8) v i = 0.4v -100 -100 a input current low (pins 7, 9) v i = 0.4v -400 -400 a input current high (pins 7, 8, 9) v i = 2.4v 10 10 a comparator threshold (pin 10) v r = 5v, i 0 = l, i 1 = l 400 415 430 400 415 430 mv v r = 5v, i 0 = h, i 1 = l 240 255 265 290 300 315 mv v r = 5v, i 0 = l, i 1 = h 70 80 90 195 210 225 mv comparator input current (pin 10) 20 20 a off time r t = 56k, c t = 820pf 25 30 35 25 30 35 ms package pin function function pin gnd 1-3 v m 4 n/c 5 a out 6 n/c 7 emitters 8 gnd 9 b out 10 timing 11 v m 12 gnd 13-17 v cc 18 i 1 19 phase 20 i 0 21 n/c 22 current 23 v r 24 n/c 25-27 gnd 28 plcc-28 (top view) q package dil-16 (top view) j or n package logic supply voltage, v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7v output supply voltage, vmm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50v logic input voltage (pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6v analog input voltage (pin 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v cc reference input voltage (pin 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15v logic input current (pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 10ma analog input current (pins 10, 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 10ma output current (pins 1, 15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2a junction temperature, t j . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150 c absolute maximum ratings note 1: all voltages are with respect to gnd (dil pins 4, 5, 12, 13); all currents are positive into, negative out of the specified terminal. note 2: consult unitrode integrated circuits databook for thermal limitations and considerations of packages. electrical characteristics: (all tests apply with v m = 36v, v cc = 5v, v r = 5v, no load, and 0 c 3 unitrode corporation 7 continental blvd. merrimack, nh 03054 tel. 603-424-2410 fax 603-424-3460 uc3770a uc3770b parameter test conditions min typ max min typ max units turn off delay 22ms sink driver saturation voltage i m = 1.0a 0.8 0.8 v i m = 1.3a 1.3 1.3 v source driver saturation voltage i m = 1.0a 1.3 1.3 v i m = 1.3a 1.6 1.6 v output leakage current v m = 45v 100 100 a uc3770a uc3770b electrical characteristics (cont.): (all tests apply with v m = 36v, v cc = 5v, v r = 5v, no load, and 0 c important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. customers are responsible for their applications using ti components. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 2000, texas instruments incorporated
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