TCA955 SIEMENS | Alldatasheet

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@ High control accuracy @ Large supply voltage range ical ic Typical Applications oe Speed control in il @ Cassette recorders @ Record players @ Movie Cameras PDIP 16 @ Control system drivers — $$, Type Ordering Code Package MBITCA 955 | Q67000-A983 P-DIP-16 § Not for new design The TCA 955 is suited for the speed control of DC motors. The principle corresponds to a clocked control. Outstanding features are its high control accuracy, its large supply voltage range, and the possible current saving. Additionally, the IC features a battery voltage indicator. 688 8.90

Block Diagram for Speed Control with TCA 955 Q R. a Ry 2 + Yoyo 4-4} Maem Lp 10 f050K0 GebtltosTeF ig, | 33nF Lr oor 4 % 2022 to 10nF| i i ‘Actual [Reference £80610 Value | |Vatue M6 [] 20.66 Viton KR 7 n 3Hinput IFrequency| “] Mono Pre- IComp.+ ISwitching| | 4H K) BD 433 RPM | Jampitier?*fooubler |) Flop Erege | pepe" —Joscitatr| | 2208 Ww eee ap o =10pF [Battery Vottage | Jas, Voltage Stabili- Ys, Indicator zation a HET 7 BERIT us ZR 1040 pc 25 ko { 1 1 Ms Dimensioning Notes @ The internal voltage stabilization offers the following advantages. ~ operation with highly varying supply voltage, ~ wide range of supply voltage. @ in order to receive pulses with a steady duty cycle at the output, symmetrical pulses must be applied to the input. @ tis recommended to use multipole tachometer generators as this improves the accuracy of control and possibly the power consumption. @ The power consumption can considerably be reduced by means of the switching frequency oscillator at low electric motor time constants. @ Higher accuracy can be obtained by using a second-order filter instead of C;. @ When using rapidly starting motors, the precharge circuitry reduces overshoots. Siemens Aktiengesellschaft 689

Parameter [ Symbor | Cimitvaives | Unt ‘Supply voltage Vs v Supply voltage Vs v (pin 11 and pin 15 connected) Output current pin 16 Ig 200 mA Output current pin 12 Toueo 15 mA (LED output) Power dissipation, LED output [Poo 50 | Junction temperature Li 150 °C Storage temperature range Tag —55 to 125 °C Thermal resistance system ~ air Ren sa 85 KW Operating Range With internal short-circuit stabilization Vs 2006 v (pin 11 and pin 15 connected) With internal stabilization Vs 48 to 16.0 |v (Vs to pin 15) Characteristics Vz = 2.2 V to 16.0 V; T, = 25°C | Parameter min [wp max | Unit Controller Current consumption Vs = 4.8 V Ts 83 mA Vs = 16 V Is 15.5 mA Stabilized voltage Vetan 2.75 3.00 3.30 v Vs = 4.8 to 16 V Input threshold (pin 3) to ground y 0.46 x Vy; 0.485xVj, | 051xY, | Vv i Hysteresis of input threshold Ay, 0.015%, | 0.03xy, | V : Offset voltage (pin 3 to pin 2) Vortsot "1 20 mv | Output transistor saturation voltage Ig= 50mA Vo sat 0.84 v i Jq= 100 mA Vo sat 0.92 v Siemens Aktiengesellschaft 690

Vz = 2.2 V to 16.0 V; Ty = 25°C Limit Values Porameter symbol in unit Controller 12.55 1485 | 17.64 Rated rpm?) a eee | EE | | rpm BrRy-C | PR) Cy | p-Ry Ce Errorinrpmwith : a 0224) duty cycle controls) from 0 to 1 | np O, | Switching Oscillator ewes | Frequency t Ss Hz Average voltage pin 10 Vo osc To4asxvy | Vv Voltage pin 11 i 0.18 x ys v peak to peak Va osc Battery Voltage Indicator Threshold voltage Yon | 18 v Viorr 1.0 v NF Ot Hysteresis Vay 220° mv Input current A _ 02 pA Saturation voltage Voveo 054500 | V Gg LED output?) x]eo Formulae 14.85 Rate rpm nm 35° [rpm is BR, Ce Switching frequency f= end {Hz} *) Duty cycle 4 f= t vee in operation without switching oscillator. Reference value Veer =0.44xV;, [V] Precharging voltage atC; Ve= 0.87 Vacr [V) fret netoonss (pin 6 and pin 7 connected) 2) p= number of pole pairs of the tachometer generator. 3) in applications without switching oscillator. 4) A protective resistor of 500 Q + 20% is integrated inside the IC. : Siemens Aktiengesellschaft 691

Saturation voltage of output transistor Rpm versus ambient temperature Output voltage versus output current Vs = 12V; Ry x Cp =100 ps Vv a 42 0 es CTT "OT TUTTE ery boas 1 ecm! TT NTT NUTT CERES ooN PEPE LOWE ow EET TTT CoN CE os \\ eAEEEEEEE SCTE PEEE HE Po ; PTET ss 0 50 00 15 200 mA 5 0 6 cl) Bn 10°C —h — +h ‘Current consumption Rpm versus supply voltage | at ‘eras supply voiage . Ta 25°C; Ry xX Co = 100 us

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