TA7245BP TOSHIBA | Alldatasheet
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——— TA7245BP/BP(LB)/CP/F DC MOTOR DRIVER IC. The TA7245BP/CP are 3-phase Bi-directional motor driver IC. It is designed for use VTR, tape deck, floppy disk and record player motor drivers. It contains output power drivers, position sensing circuits, control amplifier and cW/CCW control circuit. . 3-Phase Bi-Directional Driver and Output Current Up to +1.2A. . Few External Parts Required. . Wide Operating Supply Voltage Range : Vcc(opr) (MIN. )=7V . Forward and Reverse Rotation is Controlled Simply by Means of a CW/CCW Control Signal Fed Into 10 PIN. . High Sensitivity of Position Sensing Amplifier. (Vy=10mv(Typ.), Recommend to Use TOSHIBA Ga-As Hall Sensor "THS" Series.) . Surge Protect Diode Connected for All Input Terminals. (Position Sensing, Control, CW/CCW Control Inputs.) . DIP-14F (TOSHIBA 5D14BP-P) Power Package. MAXIMUM RATINGS (Ta=25°C) cote) TA7245F Note : Ta=25°C, Without heat sink rosin conponarion —43-
TA7245BP/BP(LB)/ CP / Fe on 625402 Sim UT 3 =| 8/= [ Saale! =o > Bg g| B T 7 — [ 3/8 s{l5) 265+02 ~S ara Sara S148 625402 2F ' a z il s2to2f alg By =$/ Th Ff 265402 3 3s ee aa Sieibd ata By | INA Fs ae | itt 15 ea (23] 09 i jgstu. Fa] 12201. llossos p08 fo1e0.25 40) Bsa) EY 7: 12501 6 0.2: i82TYP isotype Soe [6 0259) Package width and length do not include mold protrusion. Package misth aud length do not 7 i on. Allowable mold protrusion is 015mm. Allowable mold protrusion is 0.15mm. [sere = be = — __265+02 160402 6.25+02 44t01 4s|e € al jele @ $) SI S| & + 2 5 ee? I : Ic {25 4)1240i/05 +01 5 iO) |loator 18 @)0256 0. Ree e256] Lone [eS {elo2ii) - S| x -3 32t02 Z 3 #| 31 59 a aamTnh| ae lyo2to2 Ei iso. 3 wh 26202 S Package width and length do not Package width and length do not include mold protrusion. inelude mold protrusion. Allowable mold protrusion is 015mm, | Allowable mold protrusion is 0.15mm. JEDEC = JEDEC = TOSHIBA HSOP14—P TOSHIBA _HSOP20-P—450 TOSHIBA CORPORATION —— -— —44—
TA7245CP TATZ45F ) ve PIN No. TA7245BP(LB ey CK . ’ ea ae tn f ee mae) en Fost7 0H Ss sv (De) [ SENSING CIRCUIT (Ay mOEKSCNCICIC)—€O amr . (PIN Ha Hp He ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vcc=12V, Ta=25°C) TEST CHARACTERISTIC symBoL |cIR-| TEST CONDITION min. | TYP.| MAX. [UNIT CULT Quiescent Current Tec2 FRS=5V [2] 5s] 9 | mA Saturation Voitage | Lever | VsaT1 Tp =400mA [= |a0] 15 | v Cut-off Current vco=20¥ p= [= | [a Position Sensing Input Sensitivit: Va 10 mv Maximum Position Sensing Input Operating emmn [= [fo | = ocor2es | Rotation Control = wt on otation Con ee ee rosin cornrorntin —45-
mar 8 © OG Ore ver =e & coum a SW, (OFF AT Igg TEST) QJ ¢ © rie ; wat af X INPUT ~<a) 2 o PRS INPUT a ee -OL__ Dm © VRE TEST CIRCUIT 2 vows input, ° — @ (2) ©Voo= 12V , as oe | = Bel SI & a ly =@ a () - > OJ tommx test g 75k a} & © rostusa conponanion
INPUT/OUTPUT CHARACTERISTICS Yue Yio B B oy=5 a - =~ Vox + —=(2-Vi1) 2ERO TORQUE ROTATION VyF shows voltage drop at RF. That is, in the case of star connection, when coil current is Iq" VNF=RE- IL See the following circuit. v eo In Ib Rp VNF Further, if inputs (11 pin, 12 pin) are shorted or V112V12, torque at the circuit becomes zero. However, this zero torque state also can be obtained by setting FRS input (10 pin) to specified voltage or by placing the circuit in open state and this is rather advantageous as current consumption is less. eee TOSHIBA CORPORATION —47—
TA7245BP/BP(LB)/ CP / Fs FUNCTION Pen GS ee 1 0 1 H L M 1 0 0 H M L L 1 1 0 M H L 0 1 0 L u M 0 1 1 L M H 0 0 1 M L H 1 0 1 L H M 1 0 0 L M H Hl 1 1 0 M L H 0 1 0 H L M 0 1 1 H M L 0 0 1 M 4 L 1 0 1 1 t) 0 1 i ° High Impedance 0 1 0 0 1 1 0 0 1 Note: "1" of the hole element input means that voltage above +10mV is applied to the positive side of each hall element from the negative side and "0" means that voltage above +10mV is applied to the negative side from the positive side. In this case, needless to say, DC potential must be within the specified common mode voltage range of hall element input. Further, “H", "M" and "L" of output mean Vcc-Vsar1=1/2 Vcc and VgaT2, respectively, and "L", "H" and "M" of FRS input mean application of voltage within specified values of Vp, VR and Vs, respectively. Further, by applying required voltage for control input (Vint, VIN-), measure the circuit in operating state. TOSHIBA CORPORATION —48-
TA7245BP_ APPLICATION CIRCUIT 1 CONTROL SIGNAL INPUT ° © Voc=12V g _ EI fe lt et 1 je CW/CCW SELECTOR SW Ts oo 5 (D0) 1 # © TA?245BP, CP, BP(LB) x POPPE POP eth ee z s toa i a ist art Ip, | COIL CURRENT 1 7 iW) |g tom pone \\ 1 y SUPPLY Ly-~--—--+---4J REGULATED SUPPLY VOLTAGE OR CONSTANT CURRENT DRIVE AVAILABLE (THE CIRCUIT SHOWS THE LATTER) ® 1 Vz of a ZENER diode should be decided in accordance with the DC level of control signal input. (Vz=2.5~9V. If temperature characteristic is to be taken into consideration, 5V is recommended. Further, DC potential at the negative control input 11 pin becomes Vz#RF-IL) #2 As to Rp, although it should be decided acoording to coil impedance, F/V converted voltage (control input) and required starting torque, it is recommended to set at 0.3~ 50. *3 Connect, if required. min. = TOSHIBA CORPORATION —49—
° © Voo=12V INPUT VOLTAGE a ice ° E) a 2 Ba wet Bee . C GQ z L ae NS ° te ek x - = SENSING INPUT Hp ie 3 3) cW/CCW SELECTOR SW s oo 5 x rst) Y TG} af a = © © OND Pp -— Ta TA7245BP, CP, BP(LB) Pp — Ta TA? 245F rt tt THERMAL RESTSTANOE| nnn THERMAL RESISTANCE th(j-0)=8C"¥ Rtn( joe) = Se
2 Ren (s-e 8G oe CCE TC
Rtn(j-a)= 54 “W th(j-a) 3 |_| & Noto With S0XS0x 1m & — a & s ge NG, ae 4 g es, FI Nz, aa 2, a as Es ~ a Ca . e ™ J %, f | Se & Xe 5 * NS, = Ne SS ee INx e Ed ‘ San Ye, RB 2 ‘%, wr Sy, 8S ‘ \\%, pp HOUT Pte WITH * Hear stme OT Heap sw NY ol — 0 50 100 150 200, °5 50 100 150 200 AMBIENT TEMPERATURE Ta (C) AMBIENT TEMPERATURE Ta CC) —50-
CONTROL SIGNAL INPUT METHOD Normally, control voltage which is proportional to (or inversely proportional to) rotation speed (F/V converter etc.) is fed into the front stage of the TA7245BP differentially or single polarity. The gain from control input of thé TA7245BP to output (at RF terminal) is 5.5 times as indicated in the specification. it is however possible to improve characteristic of W/F, etc. by reducing the gain with NF applied. It’s application example is shown in the diagram below. Further, when NF is applied (Also, when not applied), it is necessary that DC voltages (V11,V12) of control inputs (11 pin, 12 pin) are within the range of values (2.0~Vcc-2.5V) shown in the standard. P: 1g In addition, when input DC level and F/V converted output (control output) cannot be matched with IC input, a DC level shift diode and attenuator should be inserted in front of IC input, An example is shown in Fig. l-c. a) IN CASE OF POSITIVE INPUT (wet ) Fig. 1-a Veont g y ‘ Se oe ~ On ~ Ty ee OOO 2) 3 V2 Rp b) IN CASE OF NEGATIVE INPUT (Ne Veont) Fig. 1-b Yeo eos Bgl tersesmor Ba) SRT Veont © @) ie , ViesVrer " Yar Veont’ ape Rp Rp CONTROL Re Rp DC level of control output is shifted by a zener diode and Vz control signal output is attenuated by R] and R2. Fig. l-c min $= TOSHIBA CORPORATION
POSITION SENSING ELEMENT DRIVING METHOD The TA7245BP has a wide range of common mode voltage range (the specification is 2 to Vcc-2.5V and therefore, 2 to 9.5V when Vcc=12V) of the position sensing element (generally, a hall sensor) input and therefore, both the constant current drive and constant voltage drive of a hall sensor are applicable. As a hall sensor, Toshiba Ga-As hall sensor THS series are recommended. When compared with In*Sb hall sensor, the Ga-As hall sensor has various merits such as excellent mechanical strengths, temperature stability and less saturation characteristic to magnetism and current. However, it is considered that use of this sensor was so far difficult as it’s sensitivity is lower than In-Sb hall sensor, On the TA7245BP in order to make it possible to use the Ga-As hall sensor which has merits on almost all items except sensitibity, sensitivity of the position sensing amplifier has been increased with less offset voltage. Further, if W/F characteristic is poor, increase of hall input may be effective in some cases. (However, be careful not to exceed max. allowable input). . Yoo Vec Re Ra Rp Rg POSITION SENSING ELEMENT DRIVING METHOD (1) (2) (For details refer to the technical data for Toshiba Ga-As hall sensor THS series.) yosHima ConPpoRATON | —52—
ooo, TA7245BP/BP(LB)/CP/F CAUTIONS IN APPLICATION IC for motor drive have several high impedance input terminals such as hall element input, control signal input, etc. and to handle a switched high output current. Because of such a reason. Care should be taken not to make a parasitic oscillation path caused by unnecessary feedback. Further, as load is a coil, it is necessary to pay attention to prevent destruction by impulse at time of ON/OFF, particularly, application of voltage and current in excess of standard values to the output transistor when supply voltage is at high level (Vcc=18V or above). It is recommended to use the TA7245BP at supply voltage below 12V and the TA7245CP at below 18V. If they are used supply voltage above these values, the above-mentioned cautions should be followed. (1) CAUTIONS FOR RELIABILITY DESIGN a) Do not into the output transistor inside IC into the high voltage and current operating region. (Especially, when a motor is locked, Vcc is ON/OFF, output is shorted, etc.) b) It is desirable to design the output ringing absorbing capacitor in capacitance as small as possible (the output transistor may be destructed by charging/dis-charging current of this capacitor in some cases). If it becomes a problem, it is recommended to review not only capacitance but also connecting point and connecting method (delta or star connection) in addition to taken an oscillation preventing measure described later further- more, to insert resistor (3 to 309) in series to the capacitor. c) In installing to a printed circuit board, be careful not to apply an abnormal force to the fin of IC and moreover, to solder in several seconds (at 260°C). d) It is an effective method for assuring reliability to provide a large earthing area on a printed circuit board to promote heat-radiation from the soldered fin of Ic. (2) CAUTIONS FOR WIRING It is recommend to design a print pattern with the following methods taken into consideration in order to prevent parasitic oscillation. == TOSHIBA CORPORATION 53-
TA7245BP/BP(LB)/CP/F a) The output coil current path line should be provided separately from other earth one because the coil current includes switched high current. In particular, it is recommended to design a line from Ry terminal (5 pin) to the earth so that it’s impedance does not become common to other circuits. (This is especially important.) If this is not possible or oscillation cannot be eliminated completely, it is adviced to connect a capacitor of 0.001~0.1#F paralelly with Rr. y Or me erm ee TT n/ OND am) © f IMPEDANCE MUST NOT BE COMMON TO OTHER CIRCUIT aK + Cc =Q001~O1aP on Fig. 2 b) It is also recommended to provide the hall element drive current path independently. (Especially, separately from the output current path) Further, if plunging input to the position sensing element is expected, it is advised to insert a capacitor of 0.05~1#F between the plus (+) and minus (-) terminals of each position sensing input. In addition, it should be also nav pasRP Cr consider to insert resistors in /BP(LB) series to all hall element ORCKOKCIOIOIC) inputs. If plunging input to ° At tbe the {} {h (] control input is expected, Rp A R connect a capacitor of 0.001~0.1AF between control Soa eK \\) IMPEDANCE TO OTHER CIRCUIT ~* GND Fig. 3 TOSHIBA CORPORATION i$ —54-
ee) TA7245BP/BP(LB)/CP/F c) If parasitic oscillation in a high frequency tange above 5MHz is observed, commonly connect the capacitors from all coil outputs and connect a capacitor (C=0.01~ 0.1uF) to Rp terminal (5 pin) from this connecting point (Fig. 4-a). Further, it is also recommended to consider a method to connect capacitors to RF terminal from respective coil outputs separately from the ringing absorbing capacitor (Fig. 4-b). vi Lg non Be TT wv TAT 245 BP/0P TAT 245BP/CP BS Lan) /BPCLB) TT ’ vero) Fo TT © n oS =O) ©rr c c= 001~ a1nF Rp yg OR B00 OA Fig. 4-a Fig. 4-b d) It is recommended to connect a path capacitor directly from Vcc terminal (9 pin) without giving common impedance to GND. Further, it is also effective to insert C2 (0.01~0.1#F). vont] teressnevee Bus | ap) mare] 0 ee Tn / © = m sce J 3 exp Fig. 5 toni conporarion —55—
TA7245BP/BP(LB)/CP/F Sl (3) CONNECTION OF OUTPUT RINGING ABSORBING CAPACITOR It is advised to connect the output ringing absorbing capacitor to GND from each coil terminal. In addition, it is also advised to consider the following methods from the viewpoint of parasitic oscillation prevention as well as destruction prevention. a) Change of capacitance b) Delta connection (Fig. 6-a) c) Connection to Voc instead of GND (Fig. 6-b). In this case, however, attention should be paid to destruction. If voltage/current locus is outside ASO, it is necessary to connect resistors in series with capacitors. And propose to connection to RF terminal. d) Connect resistors in series with capacitor (Fig. 6-c). e) Combination of a), b), c) and d). ous Ore A, (o)2 0 i) Lore Ga] tarzssneor (= tlm» GQ] wrssnerer be Le) See Bette J gre Be Ta Fig. 6-a Fig. 6-b Qvee @" @) TAT245BP/CP by ban) gr ee Tn * mii Fig. 6-c yosnima conPoRATION ————— —36-
es TAT IABP /BP(LB)/CP /F OTHER CAUTIONS Depending upon capacity and connecting method of the output capacitor, the output transistor inside IC may be destructed in some cases and it is therefore recommended obtain voltage/current locus of the output transistor through the measurement shown below and confirm that the locus is within ASO. (Especially, the measurement at time of SW ON/OFF, CW rotation--CCW rotation— CW rotation is important). CURRENT PROBE To Y-AXIS OF
080 ILLOSCOPE
@ Nf Oe] eo RBCOMMENDED 70 TAKE NOT ONLY (=) rl iy BUT ALSO Ly AND Lig
70 X-AXIS OF
Fig. 7 a rim corporation —57-