ordering number : enn6194 22704tn (ot) no. 6194-1/7 overview the LB1939T is a two-phase excitation bipolar stepping motor driver that features low voltage operation, a low saturation voltage, and low power consumption. it supports constant voltage and constant current drive, can control two iris motors, and is optimal for shutter, iris, and af drive in 3 v battery operated still digital cameras and other battery operated equipment. features ? low-voltage drive dual power supply operation: vs = 1.6 to 7.5 v, v dd = 1.9 to 6.5 v single power supply operation: vs = v dd = 1.9 to 7.5 v ? low saturation voltage output: vosat = 0.3 v at i o = 200 ma ? supports constant voltage and constant current drive ? built-in reference voltage circuit (vref = 0.9 v) ? miniature, thin form package (thickness t = 1.1 mm) package dimensions unit: mm 3246-tssop20 LB1939T sanyo electric co.,ltd. semiconductor company tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110-8534 japan 2 channel h bridge constant voltage/ constant current driver ic monolithic digital ic any and all sanyo products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircrafts control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. consult with your sanyo representative nearest you before using any sanyo products described or contained herein in such applications. sanyo assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo products described or contained herein. parameter symbol conditions ratings unit maximum supply voltage v bmax vs1, vs2, v dd C0.3 to +10.5 v applied output voltage v out out1, 2, 3, 4 C0.3 to +10.5 v maximum output current: out1, 2, 3, and 4 i omax t 10 ms 400 ma applied input voltage v in ena, in, vc 10.5 v allowable power dissipation pdmax when mounted on a printed circuit board * 0.8 w operating temperature topr C20 to +85 c storage temperature tstg C55 to +150 c specifications absolute maximum ratings at ta = 25c note: circuit board: 114.3 76.1 1.6 mm 3 glass epoxy board 0.65 (0.33) 0.22 0.5 0.15 (1.0) 0.08 1.2max 6.4 4.4 6.5 1 10 20 11 sanyo: tssop20 [LB1939T]
no. 6194- 2 /7 LB1939T parameter symbol conditions ratings unit min typ max standby mode current drain i stb vs = v dd = 6.5 v 0.1 1.0 a [regulator output circuit] v ref output voltage v ref i ol = 0 to 1 ma 0.85 0.9 0.95 v sv dd output voltage vsv dd i ol = 10 ma 4.7 4.8 v [h bridge output circuit] out pin output saturation voltage 1 vosat1 v dd = 5.0 v, vc = sv dd , vs = 2.0 v 0.20 0.30 v (saturation control mode) i o = 200 ma (pnp transistor side) out pin output saturation voltage 2 vosat2 v dd = 5.0 v, vc = sv dd , vs = 2.0 v 0.10 0.15 v (saturation control mode) i o = 200 ma (npn transistor side) out pin output voltage 1 v out 1 v dd = 6.0 v, vc = 1.5 v, vs = 3.5 v 2.8 2.9 3.0 v (constant voltage control mode) i o = 200 ma (pnp transistor side) out pin output voltage 2 v out 2 v dd = 6.0 v, vc = v ref , vs = 2.0 v 1.65 1.75 1.85 v (constant voltage control mode) i o = 200 ma (pnp transistor side) out pin output current 1 i out 1 v dd = 6.0 v, vc = 0.9 v, vs = 3.5 v 197 210 223 ma (constant current control mode) rl = 5 ? (between out and out), rfb = 1 ? out pin output current 2 i out 2 v dd = 6.0 v, vc = v ref , vs = 2.0 v 189 210 231 ma (constant current control mode) rl = 5 ? (between out and out), rfb = 1 ? vs system operating current drain 1 i s 1 vc = sv dd 4 7 ma vs system operating current drain 2 i s 2 vc = vref 1.5 3 ma v dd system operating current drain 1 i dd 1 vc = sv dd ena1 = 2 v 4 7 ma v dd system operating current drain 2 i dd 2 vc = v ref ena1 = 2 v 4 7 ma vc input voltage range vc 0.1 7 v vc input current ivc v dd = 6.0 v, vs = 2.0 v, vc = 5.0 v 0 50 100 a [control input circuit] control pin maximum input current i ih v ih = 5.5 v 70 100 a i il v il = gnd e1 0 a electrical characteristics at ta = 25 ? c, vs = 3.0 v, v dd = 5.0 v parameter symbol conditions ratings unit min typ max operation guaranteed voltage range 1 v opr 1 v dd system, vs = 2.0 v 1.9 6.5 v operation guaranteed voltage range 2 v opr 2 vs system, v dd = 5.0 v 1.6 7.5 v input low-level threshold voltage v il ena1, ena2, in1, in2 e0.3 +1.0 v input high-level threshold voltage v ih ena1, ena2, in1, in2 2.0 6.0 v allowable operating conditions at ta = 25 ? c 0.2 0 0.4 0.6 0.8 1 e 20 0 20 40 60 80 100 pd max ? ta mounted on a 114.3 76.1 1.6 mm glass-epoxy printed circuit board allowable power dissipation, pdmax w ambient temperature, ta c
no. 6194- 3 /7 LB1939T truth table pin assignment input output ena in out svdd mode 1 2 1 2 1 2 3 4 l l standby mode (zero current drain) h h l h on channel 1: reverse l h l on channel 1: forward h h l h on channel 2: reverse l h l on channel 2: forward blank entries indicate don?t care states. blank entries indicate off states. 10 9 8 7 6 5 4 3 2 1 20 13 14 11 15 16 17 18 19 12 vc1 s-gnd vc2 vref ena1 ena2 in1 in2 fc1 fc2 vs2 out4 rfg2 out3 out2 rfg1 out1 vdd svdd vs1 top view LB1939T
no. 6194- 4 /7 LB1939T vdd-sw reference voltage logic circuit vdd vc1 vs1 out1 out2 vc2 out3 out4 vs2 fc2 rfg2 svdd vref = 0.9 v in2 ena2 ena1 in1 s-gnd fc1 rfg1 70 k 20 k 70 k 20 k 65 k 80 k 65 k 80 k 65 k 80 k 65 k 80 k block diagram
application circuit example 1 no. 6194- 5 /7 LB1939T ena1 ena2 in1 in2 s-gnd svdd vref vc1 vc2 rfg1 rfg2 out1 out2 vdd vs2 vs1 out3 LB1939T LB1939T out4 out1 out2 out3 out4 constant voltage control mode: out outputs a 1.75 v, which is vref (0.9 v) 1.95. * : fc1 and fc2 are left open. ena1 ena2 in1 in2 s-gnd svdd vref vc1 vc2 rfg1 rfg2 vdd cpu cpu vs2 vs1 constant current control mode: the rfg voltage is controlled so that vref/4.5 = 0.2 v. therefore, when rfb is 1 , the circuit operates in constant current drive with icoil = 0.2 v/1 = 200 ma. * : there are no magnitude constraints on the inputs (ena, in) and the supply volt ages (v dd , v s ). for example, the ic can be operated at v in = 5 v, v dd = 3 v, and v s = 2 v. fc1 fc2 application circuit example 2
notes on constant current control settings the LB1939T constant current control circuit has the structure shown in the figure at the right. the voltage input to the vc pin is resistor divided internally (by 70 k ? and 20 k ? resistors) to 1/4.5 and input to the plus (+) input of the constant current control amplifier as reference. the minus (e) input of this constant current control amplifier is connected, through the wire bond resistor rb (= 0.1 ? ), to the rfg pin. the constant current control circuit operates by comparing the voltage generated by the external current detection resistor connected to the rfg pin and the reference voltage mentioned above. note that the voltage at va will be that given by the following formula since the bias current ib (= 1.5 a) flows from the constant current control amplifier plus (+) input during constant current control operation. va = vc/4.5 + ib 20 k ? = vc/4.5 + 0.03 therefore, the logical expression for setting the constant current iout is as follows. iout = va/(rfb + rb) = (vc/4.5 + 0.03) / (rfb + rb) ......(1) no. 6194- 6 /7 LB1939T application circuit example 3 ena1 ena2 in1 in2 s-gnd svdd vref vc1 vc2 rfg1 rfg2 out1 out2 vdd cpu vs2 vs1 out3 out4 channel 1 operates in constant voltage control mode: out outputs v dd 3k/(3k + 6k) 1.95 channel 2 operates in constant current control mode: the rfg voltage is controll ed so that vref/4.5 = 0.2 v. * : fc1 is left open. fc2 6 k 3 k LB1939T vs r l rfg out1 out2 rb = 0.1 rfb iout vc constant current control amplifier pad va ib = 1.5 a 70 k 20 k a13864
ps no. 6194- 7 /7 LB1939T this catalog provides information as of february, 2004. specifications and information herein are subject to change without notice. specifications of any and all sanyo products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer?s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer?s products or equipment. sanyo electric co., ltd. strives to supply high-quality high-reliability products. however, any and all semiconductor products fail with some probability. it is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. in the event that any or all sanyo products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of sanyo electric co., ltd. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equipment, refer to the delivery specification for the sanyo product that you intend to use. information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. constant current control usage notes this ic supports both constant current control and constant voltage control modes. however, since both of these control circuits operate at all times, certain of the limitations imposed by the constant voltage control circuit apply may when using constant current control. for example, if constant current control is used with the application circuit shown in figure 2, if vc = 0.9 v (= vref) and rfb = 1 ? , then the output current can be calculated as follows from (1) on the previous page. iout = (0.9/4.5 + 0.03) / (1 + 0.1) = 0.23/1.1 ? 0.209a here, if the value driven load resistance rl is r, since the rfg pin voltage is 0.23 v and the npn transistor output saturation voltage is 0.1 v (typical), the pnp transistor output pin voltage can be calculated as follows. vout = (rfg pin voltage) + (npn transistor output saturation voltage) + (voltage across the load terminals) = 0.23 + 0.1 + 0.209 r = 0.3 + 0.209r at the same time, however, this ic?s internal constant voltage control circuit controls the output voltage as follows. vout' = vc 1.95 ? 1.75 v therefore, it will not be possible to use the constant current control mode if the value of r is set so that vout is greater than vout'. that is, the condition 0.33 + 0.209r > 1.75 implies that r > 6.79 this means that constant current control can be used when the value of the load resistance used is strictly less than 6.79 ? .
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