βTDA1085A

The βTDA1085A is a speed controller integrated circuit for universal motors, made by IPRS Băneasa [1].

The I.P.R.S. Băneasa Full Line Condensed Catalog (1990) lists the βTDA1085A as a monolithic integrated circuit with all the functions needed for the speed control of universal (AC series) motors in an open or closed loop configuration, which can also define the initial speed/time characteristics; it gives a phase angle varied trigger pulse to the motor control triac [1]. Its functions include a guaranteed full wave triac drive, soft start from power-up, an on-chip frequency/voltage converter and ramp generator, current limiting and direct drive from the AC line [1].

The catalog gives an operating temperature of 0…+70 °C (storage −25…+125 °C), a regulated voltage of 15.5 V, a control amplifier transconductance of at most 300 µA/V, a trigger pulse repetition period of at most 215 µs, a trigger pulse width of at most 100 µs and an output leakage current of at least 30 µA [1]. Pins (MP-117, top view): 1 current synchronisation, 2 voltage synchronisation, 3 motor current limit, 4 actual speed, 5 set speed, 6 ramp current generator control, 7 ramp generator timing, 8 V−, 9 V+, 10 ballast resistor, 11 F/VC pump capacitor, 12 digital speed sense, 13 trigger pulse output, 14 sawtooth capacitor, 15 sawtooth set current, 16 closed loop stability [1].