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TA8490F 2001-06-13 1 toshiba bipolar linear integrated circuit multi ? chip TA8490F 3 ? phase full wave brushless dc motor driver ic for cd ? rom drives this 3 ? phase, full ? wave, brushless dc motor driver ic has been developed for use in cd ? rom drive spindle motors. the TA8490F contains in its upper stage a discrete power transistor which, thanks to its low ? saturation characteristic, enables the ic to provide superior thermal efficiency. furthermore, the multi ? chip structure of this device facilitates dispersion of the heat generated inside the package, making it possible to suppress heat concentration. features multi ? chip structure (3 rn6006 chips built ? in) 3 ? phase, full ? wave, semi ? linear drive current drive / current control built ? in current limiter : i lim = 0.6a (typ.) (at r f = 0.3 ? ) built ? in reversing brake / short brake functions fg signal output (using hall element output signal) built ? in switching regulator controller built ? in hall bias built ? in thermal shutdown circuit package : mfp ? 30 weight : 0.63 g (typ.)
TA8490F 2001-06-13 2 block diagram
TA8490F 2001-06-13 3 pin assignment terminal no. terminal symbol function remarks 1 l b (b) b ? phase upper side power transistor (base) output terminal keep open. 2 l a (b) a ? phase upper side power transistor (base) output terminal keep open. 3 l a a ? phase output terminal connect to the coil. 4 v m2 supply voltage terminal for motor drive connect to v m1 externally. 5 cp switching power source system phase compensator terminal connect a capacitor between this terminal and gnd. 6 gnd2 gnd D 7 osc triangular wave oscillation terminal connect a capacitor between this terminal and gnd. 8 swc switching regulator control signal output terminal connect to the base of the switching external transistor. 9 sb run / stop control terminal h: run, l: stop 10 fgo fg amplifier output terminal outputs a signal whose frequency is determined by the cd rotation frequency. 11 brk brake mode select terminal output mode when v c > v ref 12 h b ? b ? phase negative hall signal input terminal connect to hall element output terminal. 13 h b + b ? phase positive hall signal input terminal connect to hall element output terminal. 14 h a ? a ? phase negative hall signal input terminal connect to hall element output terminal. 15 h a + a ? phase positive hall signal input terminal connect to hall element output terminal. 16 h c + c ? phase positive hall signal input terminal connect to hall element output terminal. 17 h c ? a ? phase negative hall signal input terminal connect to hall element output terminal. 18 hb hall element bias terminal open collector output. connect to the negative side of hall element bias line. 19 ct control system phase compensator terminal connect a capacitor between this terminal and gnd. 20 v cc supply voltage terminal for control circuits v cc (opr) = 4.5~5.5 v
TA8490F 2001-06-13 4 terminal no. terminal symbol function remarks 21 v c control amplifier input terminal use the control signal as input. 22 v ref control amplifier reference voltage input terminal use the reference voltage for the control amplifier as input. 23 ms mode select terminal determines output mode. 24 cd forward / reverse changeover gain adjustment terminal adjust a rotation direction changeover gain 25 gnd1 gnd D 26 r f output current detection terminal sets limiter current value and current gain. 27 l c (b) c ? phase upper side power transistor (base) output terminal keep open. 28 l c c ? phase output terminal connect to the coil. 29 v m1 supply voltage terminal for motor drive connect to v m2 externally. 30 l b b ? phase output terminal connect to the coil. absolute maximum ratings (ta = 25c) characteristic symbol rating unit v cc 7 power supply voltage v m 16 v output current i o 1.2 a power dissipation p d (note 1) 1.0 w junction temperature t j 150 c operating temperature t opr ? 20~75 c storage temperature t stg ? 55~150 c note 1: unmounted operating voltage range characteristic symbol operating rating unit v cc 4.5~5.5 power supply voltage v m 3~14 v
TA8490F 2001-06-13 5 electrical characteristics (v cc = 5 v, v m = 12 v, ta = 25 c,) characteristics symbol test circuit test condition min typ. max unit i cc1 stop mode D 2 4.5 supply voltage i cc2 1 run mode, output open D 7 15 ma input current i inh 2 v cmrh = 2.5 v D D 2 a common mode input voltage range v cmrh D D 1.5 D 4.0 v hall amp. input amplitude v h D 60 D D mv p-p hall element bias saturation voltage v hb 2 i hb = 10 ma D 1.3 2.0 v common mode input voltage range v cmrc 2 D 1.0 D 4.0 v input current i inc 2 v c = v ref = 2.5 v D D 5.0 a dead zone voltage width v dz D v ref = 2.5 v, r f = 0.3 ? D 100 D mv ? v off (f) cw mode, v ref = 2.5 v, r f = 0.3 20 50 150 control amp. input offset voltage ? v off (r) 3 ccw mode, v ref = 2.5 v, r f = 0.3 ? 20 50 150 mv current limit amp. limit current i lim 3 r f = 0.3 ? 480 600 720 ma input voltage (h) v ins (h) (run) 3.0 D v cc input voltage (l) v ins (l) (stop) gnd D 1.0 v run / stop control circuit input current i ins (l) 1 v ins = gnd D D 1 a saturation voltage (upper side) v sat (u) 4 i o = 0.6 a D 0.1 1.3 saturation voltage (lower side) v sat (l) 4 i o = 0.6 a D 0.6 1.0 v cut ? off current (upper side) i l (u) 5 v l = 16 v D D 10 output circuit cut ? off current (lower side) i l (l) 5 v l = 16 v D D 10 a input voltage (h) v ms (h) 6 ccw mode v c > v ref , brk : l 3.0 D v cc input voltage (l) v ms (l) 6 reversing brake mode v c > v ref , brk : l D D 0.5 v mode select circuit input current i inms 6 v ms = gnd D D 1 a
TA8490F 2001-06-13 6 characteristics symbol test circuit test condition min typ. max unit hysteresis voltage v hys 6 D 5 20 45 mv p ? p output voltage (h) v ofg (h) 7 source current : 10 a v cc ? 0.5 D D fg amp. output voltage (l) v ofg (l) 7 sink current : 10 a D D 0.5 v input voltage (h) v brk (h) 6 D 3.0 D v cc input voltage (l) v brk (l) 6 D D D 0.5 v short brake circuit input current i inbrk 6 v brk = gnd D D 1 a oscillation frequency f osc D c = 250pf (note) D 100 D khz charge current i osc + 7 v osc = 1.8 v 50 100 200 a triangular oscillation circuit discharge current i osc ? 7 v osc = 3.2 v ? 200 ? 100 ? 50 a sw ? reg control circuit saturation voltage v sat ? sw 8 i sw = 20 ma D 1.0 3.0 v thermal shut ? down operating temperature t sd D junction temperature (according to design specification) (note) D 175 D c note: this is not tested.
TA8490F 2001-06-13 7 function table forward reverse h a h b h c l a l b l c l a l b l c h l l h l m l h m h h l h m l l m h l h l m h l m l h l h h l h m h l m l l h l m h h m l h l h m l h m h l l a = ? (h c ? h a ) l b = ? (h a h b ) l c = ? (h b h c ) l a = (h c ? h a ) l b = (h a ? h b ) l c = (h b ? h c ) timing diagram
TA8490F 2001-06-13 8 functional description this ic is a 3 ? phase, full ? wave brushless dc motor driver of the current ? control / current ? drive type. it contains in its upper stage a pnp discrete power transistor, which, because of the multi ? chip package (mcp) structures provides high torque and thermal efficiency. in addition, when combined with a switching regulator, its efficiency can be increased still further. control amp input circuit the common mode input voltage ranges for both v c and v ref are 1 .0 to 4.0 v. the control input ? to ? drive output gain is 1 .0a / v (typ.), whose characteristic is shown below. the input is provided with a dead ? zone area whose voltage width is 1 00 mv (typ.) ? 3 0 0 1 f c rf r at typ. v v i gm mode select / short brake circuit
TA8490F 2001-06-13 9 when v c > v ref , one of three modes (reverse rotation, reversing brake or short brake mode) can be selected by setting the ms and brk pins appropriately. v c < v ref v c > v ref brk brk h l h l h forward forward h short brake reverse ms l forward forward ms l short brake reversing brake in short brake mode, the upper ? stage power transistor is turned on and the lower ? stage power transistor is turned off. in reversing brake mode, all outputs are cut off after detection of reverse rotation, causing the motor to stop. (short brake) (reversing brake) (1) when stopping the motor by applying a reversing brake after a short brake
TA8490F 2001-06-13 10 (2) when stopping the motor using reversing brake mode note: for an explanation of the reversing brake mode stopping sequence, refer to the explanation of the reverse rotation detection circuit. the short brake generates less heat than the reversing brake. therefore toshiba recommends a combined use of the short and reversing brakes when stopping the motor. run / stop control circuit when the driver ic is standing by, all of its circuits except the fg amp and the hall amp are turned off. h : start l : standby hall amp circuit the common mode input voltage range for v cmrh is 1 .5 to 4.0 v.
TA8490F 2001-06-13 11 hall element bias circuit the hall element bias current is turned off when the driver ic is in standby state. make sure that the negative hall bias line is connected to the hb pin. the remaining voltage is as follows : v hb = 1.2 [v] (typ.) at i hb = 10 ma furthermore, this circuit cannot be used if fg output is necessary in standby state. when the hb terminal is not used, the negative hall bias line must be connected to gnd with a resistor in between. fg amp circuit this circuit uses a hall element signal which is output to fgo after a schmitt stage. the fg amp has a hysteresis of 20 [mv p ? p ] (typ.) and its output voltages are high level : v cc ? 0.5~v cc [v] low level : gnd~0.5 [v] at iofg = 10 a the fg amp is active when it is in standby state. when the hall element signal is input, the fg signal is output.
TA8490F 2001-06-13 12 reverse rotation detection circuit by comparing the two phases of the hall element signal, this circuit detects a state where the phases are inverted, at which time the torque is reduced to 0. the detection accuracy is determined by the number of pulses per rotation of hall element output. note: due to its inertial force, the motor does not stop immediately after the torque is reduced to 0. output circuit this circuit uses the power transistor?s base current to regulate the circuit?s output current. the upper ? stage power transistor consists of a pnp discrete transistor (rn6006), which gives high torque efficiency. current limiter circuit the current limit value is determined by the equation below. i lim (typ.) [a] 0.1 rf 0.24
TA8490F 2001-06-13 13 triangular wave oscillator circuit triangular waves are generated by connecting a capacitor between the osc pin and gnd. the charging / discharging currents are 50 a, and the oscillation frequency is as [hz] (pf) c 2 a) ( 100 osc f taking into account efficiency considerations and the effects of noise, toshiba recommends using the ic with an oscillation frequency of more or less 1 00khz. v m output voltage (3 ? phase maximum) detection circuit this circuit selects the highest voltage from the three phases of output voltages and then outputs the voltage difference between the selected voltage and v m as a voltage referenced to gnd (v ce for the upper output stage). this voltage is filtered by a capacitor at the cp pin and compared with the triangular wave before being output on the swc pin. when using a switching regulator, the driver ic operates in a closed loop with a v ce of 0.3v (typ.) for the upper output stage. switching regulator control signal output circuit this circuit outputs the result of comparison between v ce for the upper stage and the triangular wave from one of the open ? collector output terminals. by controlling an external pnp transistor in this way, the circuit controls v m . the output function is as follows : thermal shut down circuit this circuit turns off output when t j = 1 75c(typ.) (according to design specification).
TA8490F 2001-06-13 14 external parts terminal no. function recommended value remarks c 1 control system phase correction 0.01 f (note 1) c 2 triangular wave oscillation 250 pf see page 12. c 3 power supply line oscillation prevention 0.22 f D c 4 filter 1 f (electrolytic capacitor) (note 2) c 5 forward / reverse changeover gain adjustment 0.01 f (note 3) c 6 for switching regulator 100 f (electrolytic capacitor) D r 1 hall element bias D (note 4) r 2 control amp reference voltage D (note 5) r 3 output current detection 0.3 ? see page 11. r 4 base current control for switching regulator pnp transistor 1 k ? (note 6) r 5 leakage absorption of switching regulator pnp transistor 10 k ? (note 7) l 1 for switching regulator 68 h D note 1: check carefully to see that there is no output oscillation. note 2: this is used to filter the output of the difference between the three ? phase output voltage and v m . note 3: this is used to adjust the rotation direction changeover gain. the capacitance valve and the gain are in inverse. this capacitance is to prevent from output through current. note 4: be sure to set this bias so that the hall element output amplitude and common mode input voltage fall within the ranges specified in the table of electrical characteristics. note 5: this voltage must be set to fall within the common mode input voltage range of the control amp. toshiba recommends setting it to v cc / 2 . also, consider the vref pin?s input current: 1.3 a (typ.) (when v c << v ref ) when setting the resistance value. note 6: the swc pin is an open ? collector, so that when the internal transistor saturates, its switching characteristic is degraded. toshiba recommends that when swc is low, its pin voltage should be 2v or above. note 7: the external pnp transistor used for the switching regulator has its offset voltage determined by this resistance. use a resistance of between several k ? and 10 k ? according to the switching characteristics. *: tr.1 : 2sa1241 d1 : u1gwj44
TA8490F 2001-06-13 15 test circuit 1. i cc1 , i cc2 , v ins (h) , v ins (l) , i ins i cc1 : v sb = 3.0 v i cc2 : v sb = 0.5 v v ins (h) , v ins (l) : jndged by the gap between i cc1 and i cc2 v ins : v ins = 0 v
TA8490F 2001-06-13 16 2. i inh , i cmrh , v hb , i inc , v cmrc i inh : total of a phase negative and positive input current. v ha = v hb = v hc = 2.5 v v cmrh : measure the i inh gap between v ha = 1.5 v and v ha = 4.0 v. b and c phase are measured the same method. v hb : i hb = 10 ma v inc : total of v c and v ref input current. at v cmrc = 2.5 v. v cmrc : measure the i inc gap between v cmrc = 1.0 v and v cmrc = 4.0 v.
TA8490F 2001-06-13 17 3. ? v off (f) , ? v off (r) , i lim ? v off (f) : measure v rf at v c = 2.48 v / 2.35 v. ? v off (r) : measure v rf at v c = 2.52 v / 2.65 v. i lim : change to current value after measuring v rf at v c = 1.0 v 4. v sat (u) , v sat (l) v sat (u) : determined output function by v ha + , v hb + , v hc + (2.4 v / 2.6 v). measure voltage value between v m and l a . b phase and c phase are measured the same method. v sat (l) : determined output function by v ha + , v hb + , v hc + (2.4 v / 2.6 v). measure voltage value between l a and gnd. b phase and c phase are measured the same method.
TA8490F 2001-06-13 18 5. i l (u) , i l (l) i l (u) : measure i m when l a and gnd are shortted. b phase and c phase are measured the same method. i l (l) : measure i m when v m and l a are shortted. b phase and c phase are measured the same method. 6. v ms (h) , v ms (l) , i ins , v brk (h) , v brk (l) , i inbrk v ms (h) : v ms = 3.0 v, v brk = 0 v, verify that output function is reverse mode. v ms (l) : v ms = 0.5 v, v brk = 0 v, verify that v ct 0 v ims (l) : v ms = 0 v , v brk = 0 v v brk (h) : v ms = 5 v, v brk = 3.0 v, verify that l a = l b = l c : h v brk (l) : v ms = 5 v, v brk = 0.5 v, verify that output function is reverse mode.
TA8490F 2001-06-13 19 7. v ofg (h) , v ofg (l) , i osc + , i osc ? v ofg (h) : v hb + = 2.53 v, i fgo = 10 a (source) v ofg (l) : v hb + = 2.47 v, i fgo = 10 a (sink) i osc + : v osc = 2 v i osc ? : v osc = 3 v 8. v sat ? sw , v hys v sat ? sw : i swc = 20 ma v hys : switch the v hb + from high (h) to low (l) and from l to h. measure the v hb + at the point when fgo function changes.
TA8490F 2001-06-13 20 application circuit
TA8490F 2001-06-13 21 package dimensions ssop30 ? p ? 375 ? 1.00 unit : mm weight : 0.63 g (typ.)
TA8490F 2001-06-13 22 toshiba is continually working to improve the quality and reliability of its products. nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. it is the responsibility of the buyer, when utilizing toshiba products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such toshiba products could cause loss of human life, bodily injury or damage to property. in developing your designs, please ensure that toshiba products are used within specified operating ranges as set forth in the most recent toshiba products specifications. also, please keep in mind the precautions and conditions set forth in the ?handling guide for semiconductor devices,? or ?toshiba semiconductor reliability handbook? etc.. the toshiba products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). these toshiba products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (?unintended usage?). unintended usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. unintended usage of toshiba products listed in this document shall be made at the customer?s own risk. the products described in this document are subject to the foreign exchange and foreign trade laws. the information contained herein is presented only as a guide for the applications of our products. no responsibility is assumed by toshiba corporation for any infringements of intellectual property or other rights of the third parties which may result from its use. no license is granted by implication or otherwise under any intellectual property or other rights of toshiba corporation or others. the information contained herein is subject to change without notice. 000707eb a restrictions on product use

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