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ta8492p/pg 2006-3-2 1 toshiba bipolar linear integrated circuit ta8492p/pg three-phase full-wave brushless dc motor driver ic the ta8492p/pg is a three-phase, full-wave, supply voltage-control motor driver ic. features ? output current: i o (max) = 1.5 a ? supply voltage control motor driver ? cw/ccw/stop function ? operating voltage range: v cc (opr.) = 7~18 v v s (opr.) = 0~18 v block diagram weight: 1.11 g (typ.) 4, 5, 12, 13 3st 3 frc v cc 14 7 6 matrix 11 10 9 8 h a + h a ? h b + h b ? h c + h c ? tsd 16 2 15 1 l c l b l a v s gnd the ta8492pg is a pb-free product. the following conditions apply to solderability: *solderability 1. use of sn-37pb solder bath *solder bath temperature = 230c *dipping time = 5 seconds *number of times = once *use of r-type flux 2. use of sn-3.0ag-0.5cu solder bath *solder bath temperature = 245c *dipping time = 5 seconds * number of times = once *use of r-type flux
ta8492p/pg 2006-3-2 2 pin description pin no. symbol function 1 l c c-phase drive output pin 2 l a a-phase drive output pin 3 3st switching cw/ccw/stop 4 gnd ? 5 gnd ? 6 h a ? a-phase negative hall signal input pin 7 h a + a-phase positive hall signal input pin 8 h c ? c-phase negative hall signal input pin 9 h c + c-phase positive hall signal input pin 10 h b ? b-phase negative hall signal input pin 11 h b + b-phase positive hall signal input pin 12 gnd ? 13 gnd ? 14 v cc supply voltage pin for control circuits 15 l b b-phase drive output pin 16 v s supply voltage pin for output circuit functions hall input output frs h a h b h c l a l b l c 1 0 1 l h m 1 0 0 l m h 1 1 0 m l h 0 1 0 h l m 0 1 1 h m l forward 0 0 1 m h l 1 0 1 h l m 1 0 0 h m l 1 1 0 m h l 0 1 0 l h m 0 1 1 l m h reverse 0 0 1 m l h 1 0 1 1 0 0 1 1 0 0 1 0 0 1 1 stop 0 0 1 high impedance
ta8492p/pg 2006-3-2 3 absolute maximum ratings (ta = 25c) characteristic symbol rating unit v s 20 v supply voltage v cc 20 v output current i o 1.5 a 1.4 (note 1) power dissipation p d 2.7 (note 2) w operating temperature t opr ? 30~85 c storage temperature t stg ? 55~150 c note 1: not mounted on the pcb note 2: mounted on a pcb (pcb area, 50 50 0.8 mm; cu area, over 60%) electrical characteristics (ta = 25c, v cc = v s = 12 v) characteristic symbol test circuit test condition min typ. max unit i cc-1 v cc = 12 v, 3st: gnd, v s : open ? 5.0 7.0 i cc-2 v cc = 18 v, 3st: gnd, v s : open ? 6.0 9.0 supply current i cc-3 1 stop (3st = v cc ) ? 2.5 4 ma upper v sat (u) 2 i o = 1 a (source current) ? 1.35 1.7 output saturation voltage lower v sat (l) 3 i o = 1 a (sink current) ? 0.4 0.6 v upper i l (u) 4 v s = 20 v ? ? 50 output leak current lower i l (l) 5 v s = 20 v ? ? 50 a input sensitivity v h 6 ? 20 ? 400 mv p-p hall amp. common-mode input voltage range v cmrh 7 ? 2 ? v cc ? 3.5 v stop v stp ? v cc ? 0.4 ? v cc cw v fw ? 2.5 ? 6.5 cw/ccw control operation voltage ccw v rv 6 ? 0 ? 0.4 v thermal shutdown operating temperature t sd ? ? ? 160 ? c
ta8492p/pg 2006-3-2 4 functional description ? hall amp. circuit the hall amp is a high-gain amp. the input sensitivity is 20 mv p-p (min). make sure that the input amplitude does not exceed 400 mv p-p . the common-mode voltage v cmrh 2.0 to v cc ? 3.5 v. ? cw/ccw/stop control circuit in reverse mode, the control input (3st) voltage range is v rv = 0 to 0.4 v. however, keep the voltage as close to the ic gnd as possible (see the application circuit diagram). similarly, in stop mode, keep the voltage as close to the ic v cc as possible. in forward mode, toshiba recommend s that the input voltage be v cc /2. ? output circuit the output circuit uses voltage cont rol where the upper and lower output transistors are saturated and the output current is controlled by the v s voltage. to reduce switching noise, connect a snubber capacitor to the output circuit. ? thermal shutdown circuit the circuit turns off output when t j = 160c (typ.) (according to design specification) ha + ha ? (upper) l a v s (lower) l a 3st ha + ? 20 mv p-p ~400 mv p-p
ta8492p/pg 2006-3-2 5 handling precautions cw/ccw/stop control circuit a) at 3st input, because th e input voltage ranges for v rv (reverse mode) and v stp (stop mode) are narrow, make sure no impedance is caused between the ic v cc and gnd pins. do not connect an input resistor to the 3st pin as this will cause voltage offset. b) when controlling the rotation direction using 3st input, switch the direction from reverse to stop mode or vice versa with v s = 0 v; otherwise punch-through current may be generated at output. hall amp. circuit a hall ic input amplitude of over 400 mv p-p causes an output function erro r. make sure the amplitude is within the specified range. output circuit particular care is necessary in the design of the output, v s , v cc and gnd lines since the ic may be destroyed due to short circuits between output air contamination faults, or faul ts caused by improper grounding external parts symbol function recommended value remarks c 1 power supply line oscillation prevention 4.7 f ? c 2 power supply line oscillation prevention 4.7 f ? c 3 output noise reduction 4.7 f (note 3) r 1 hall bias ? (note 4) note 3: set an appropriate value depending on the motor and use conditions. set an appropriate value so that t he hall ic output common-mode input voltage and amplitude fall within the specified ranges in the electr ical characteristics table. note 4: be sure to set this bias so that the hall el ement output amplitude and common-mode input voltage fall within the ranges specified in the table of electrical characteristics.
ta8492p/pg 2006-3-2 6 test circuit 1. i cc1 , i cc2 , i cc3 ? i cc1 : input v ha + , v hb + , v hc + (6.01 v/5.99 v). v cc = 12 v/v 3st = gnd ? i cc2 : input v ha + , v hb + , v hc + (6.01 v/5.99 v). v cc = 18 v/v 3st = gnd ? i cc3 : input v ha + , v hb + , v hc + (6.01 v/5.99 v). v cc = 12 v/v 3st = v cc 2. v sat (u) ? v sat (u) : input v ha + , v hb + , v hc + (6.01 v/5.99 v), check that the output function is at high level, then measure phases a, b, and c. v hc + + + ? + ? + ? f 4.7 f v cc v ha + + + + ? + ? + ? = 1.0 a 4.7 f 12 v v ha + 4.7 f
ta8492p/pg 2006-3-2 7 3. v sat (l) ? v sat (l) : input v ha + , v hb + , v hc + (6.01 v/5.99 v) and check that the output function is ?l?. (a-phase, b-phase, c-phase) 4. i l (u) ? i l (u) : check that the output functi on is high impedance at 3st = v cc . (a-phase, b-phase, c-phase) v hc + + + ? + ? + ? = 1.0 a 4.7 f 12 v v ha + f v hc + + + ? + ? + ? f 12 v v ha + f v cc
ta8492p/pg 2006-3-2 8 5. i l (l) ? i l (l) : check that the output functi on is high impedance at 3st = v cc . (a-phase, b-phase, c-phase) 6. v h , v stp , v fw , v rv ? v h : input v ha + , v hb + , v hc + (6.01 v/5.99 v) and check the output function. (a-phase, b-phase, c-phase) at v 3st = gnd. ? v stp : when v 3st is 8.5 v, input v ha + , v hb + , v hc + (6.01 v/5.99 v), fix the ou tput function, then check that the output function is at high impedance. ? v fw : input v ha + , v hb + , v hc + (6.01 v/5.99 v) and check that the output function is forward mode. at v 3st = 2.5 v/6.5 v. v hc + + + ? + ? + ? f 12 v v ha + f v v cc v hc + + + ? + ? + ? f 12 v v ha + f v v 3st
ta8492p/pg 2006-3-2 9 ? v rv : input v ha + , v hb + , v hc + (6.01 v/5.99 v) and check that the output function is reverse mode. at v 3st = 0.4 v. 7. v cmrh ? v cmrh : measure the i cmrh gap between v cmrh = 2 v and 8.5 v. 15 13 11 12 9 10 l b v cc gnd gnd h b + ? + ? + ? f 12 v 16 v s 14 12 v 4.7 f v cmrh a i cmrh
ta8492p/pg 2006-3-2 10 application circuit note: utmost care is necessary in the design of the output, v cc , v m , and gnd lines since the ic may be destroyed by short-circuiting between outputs, air contamination f aults, or faults due to improper grounding, or by short-circuiting between contiguous pins. 4, 5, 12, 13 3st 3 frc v cc 14 7 6 matrix 11 10 9 8 h a + h a ? h b + h b ? h c + h c ? tsd 16 2 15 1 l c l b l a v s gnd c 1 12 v r 1 v cc r 1 c 3 c 2 12 v
ta8492p/pg 2006-3-2 11 package dimensions weight: 1.11 g (typ.)
ta8492p/pg 2006-3-2 12 notes on contents 1. block diagrams some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for explanatory purposes. 2. equivalent circuits the equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes. 3. timing charts timing charts may be simplified for explanatory purposes. 4. application circuits the application circuits shown in this document are provided for reference purposes only. thorough evaluation is required, especially at the mass production design stage. toshiba does not grant any license to any industrial property rights by providing these examples of application circuits. 5. test circuits components in the test circuits are used only to obtain and confirm the device characteristics. these components and circuits are not guaranteed to prevent malfunction or failure from occurring in the application equipment. ic usage considerations notes on handling of ics [1] the absolute maximum ratings of a semiconductor de vice are a set of ratings that must not be exceeded, even for a moment. do not exceed any of these ratings. exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. [2] use an appropriate power supply fuse to ensure that a large current does not continuously flow in case of over current and/or ic fa ilure. the ic will fully break down when used under conditions that exceed its absolute maximum ratings, when the wiring is routed improperly or when an abnormal pulse noise occurs from the wiring or load, caus ing a large current to continuously flow and the breakdown can lead smoke or ignition. to minimize the effects of the flow of a large current in case of breakdown, appropriate settings, such as fuse ca pacity, fusing time and in sertion circuit location, are required. [3] if your design includes an inductive load such as a motor coil, incorporate a protection circuit into the design to prevent device malfunction or breakdown caused by the current resulting from the inrush current at power on or the negative current resulting from the back electromotive force at power off. ic breakdown may cause injury, smoke or ignition. use a stable power supply with ics with built-in protection functions. if the power supply is unstable, the protection function may not operate, causing ic breakdown. ic breakdown may cause injury, smoke or ignition. [4] do not insert devices in the wrong orientation or incorrectly. make sure that the positive and negative terminals of power supplies are connected properly. otherwise, the current or power consumption may exceed the absolute maximum rating, and exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. in addition, do not use any device that is applied the current with inserting in the wrong orientation or incorrectly even just one time.
ta8492p/pg 2006-3-2 13 points to remember on handling of ics (1) thermal shutdown circuit thermal shutdown circuits do not necessarily prot ect ics under all circumstances. if the thermal shutdown circuits operate against the over temperature, clear the heat generation status immediately. depending on the method of use and usage conditions, such as exceeding absolute maximum ratings can cause the thermal shutdown circuit to not operate properly or ic breakdown before operation. (2) heat radiation design in using an ic with large current flow such as power amp, regulator or dr iver, please design the device so that heat is appropriately radiated, not to exceed the specified junction temperature (t j ) at any time and condition. these ics generate heat even during normal use. an inadequate ic heat radiation design can lead to decrease in ic life, de terioration of ic characteristics or ic breakdown. in addition, please design the device taking into considerate the effect of ic heat radiation with peripheral components. (3) back-emf when a motor rotates in the reverse direction, stops or slows down abruptly, a current flow back to the motor?s power supply due to the effect of back- emf. if the current sink capability of the power supply is small, the device?s motor power supply and output pins might be exposed to conditions beyond maximum ratings. to avoid this problem, take the effect of back-em f into consideration in system design.
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