TCA900 ETC1 | Alldatasheet
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The TCA 900 and TCA 910 are monolithic integrated circuits in Jedec TO-126 plastic package. They are designed for use as speed regulators for DC motors of record players, cassette recorders and players, The TCA 900 is particularly suitable for battery operated portable equipments, and the TCA 910 for car-battery and mains operations. ABSOLUTE MAXIMUM RATINGS TCA 900 | TCA910 v. Supply voltage 14v 20v : Prot Total power dissipation at Tamp= 70°C o8w ' at Tease = 100°C 5W Tit ‘Storage temperature -56 to 150°C y Junction temperature 150°C ORDERING NUMBERS: TCA 900 TCA 910 MECHANICAL DATA Dimensions in mm Pin 3 connected to metal part of mounting surface pyre 78 a Rae, A 3 a ii A Hi ‘ i l . ages 12 22 058 cous 409 6/82
CONNECTION AND SCHEMATIC DIAGRAMS to o 92 | - Roe ot 7 | fs ] ! o | eat | : 2 q at a <0 ' f 7" - 1 a ae | 0. i L {toy _ | bs ome THERMAL DATA Rin j-case Thermal resistance junction-case Typ. 10 °C/W Rin pamp Thermal resistance junction-ambient Typ. 100 °C/W ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Tym» 25°C unless otherwise specified) ee Viet Reference voltage V5>5.5V {between pins 2 and 3) | I, = 70mA Ry=0 Vv i 4 Quiescent current V,= 5.5V | 38 (at pin 3) m= 0 | Ry=0 mA | {for TCA 900 only) Im = 70mA Ry=912 Vv Vin Output voltage V.=9V {for TCA 910 only) Im = 70 mA Ry = 2702 v 410
ELECTRICAL CHARACTERISTICS (continued) [eae [oe Po J Vi-2 Dropout voltage BV enlVmn= 1% Igy = 70 A Ry = 910 12 v Ip Limiting output V,=55V current (at pin 2) Vo-37 0 k= Alg/Aly Vv," 5.5V Ip = 70mA Big = + 10ma, Rr=0 Vm <™ /aV, Line regulation V, = 5.8V to 12V Vn {for TCA 900 only) | ty = 70mA Ry = 912 wv Vm “—™ /AV, Line regulation V,= 10V to 16V Vn {for TCA 910 only) Im = 70 mA Ry = 2702 IV aVin SEM [1m Load regulation V,= 5.5V Vin Igy = 40 to 100 mA Rr=0 ima Veet “2! jaT amp Temperature Vi-3" 55V Veer coefficient 12 = 70 mA Tanp=~20t0 70°C) PC Fig. 1 ~ Test circuit. Fig. 2 - Typical application circuit. % 1freasod 2 S y 2 3 ese 3 [=> , n | Set ig | | | I ~ Ob A im Ou ln, O}'m 0.1 ue Im ( pe Lf z 7 , au
ib} i ccm output current a power dissipation vs. am- Coie Coo] 1 bient temperature cman isssuecuscsececceness a ipieesitersstertstect psssesesseveserstiti aa ror spsernretanreara ERE PEE 4+ EE rH rH AGH Ausicpsssesttecatctel neue ceeTseee au MMMM GTid testi Soan test eeseeqceuaeesenaeeee| im coy fu eseguecee! geen segucaeeeueneuesiaes rho I ee eT a Pee FE sueocae Seeeueeeesces See EE, EEN oe Buebsssaeeeceseeess ‘Cpe c coer Cull Eero aspen t fap 4 foots Aa EERE HEH og imi HESS ee oe ise owe ew wm my EA HEY APPLICATION INFORMATION ee The regulator supplies the motor in such a way as to keep its speed constant, independent of supply voltage, applied torque and ambient temperature variations. oe - Mini The basic equation for the motor is: fig. 6 - women Eq allow: . Vin = Eg + Rm lm = a1 ntage 5 rH ae Where: Vm = supply voltage applied to the motor Ht . = 4 Po ores pashan =f E>. = back electromotive force roy ae n= motor speed (r.p.m.) “ poor Z Rm = internal resistance (of the motor) Het 4 \\m = Current absorbed (by the motor) “Crt enna a and a,= constants ue t on | c= drive torque pat A voltage supply with the following characteristics ra sean ty E =E, — E = electromotice force af | Ro= -Rm R, = output resistance wll ee gives performance required. oo wm mem we MOmIa This means that a variation in current absorbed by the motor, due to a variation in torque applied, causes a proportional variation in regulator output voltage. In fig. 6 is shown the minimum allowable Eo vs. Rr. The TCA 900 and TCA 910 give a reference constant voltage Vrer (between pins 2 and 3) independent of variations of V,, |z and ambient temperature. : They also give: 1, = Ig3 + a/k Where: 3 = total current at pin3 [G3 = quiescent current at pin 3 (tz = 0) 13° = current at pin 2 k = constant The output voltage Vn, applied to the motor has the following value: Veet 1 1, Vn = Veer +Rr | ae (t+2) + tas) + Ry | Term 1 Term 2 Term 1 equals Eg and fixes the motor speed by means of the variable resistor Rg; Term 2 -—_ Ry equals the term Rim. Im and, therefore, compensates variations of torque applied. Complete Compensation is achieved when: Ry = k Rm Ip Rr max > K Rm min instability may occur. “Bt mx 7 Kio ee Oe 412