βTDA2581

The βTDA2581 is a control circuit for switched-mode power supplies, made by IPRS Băneasa [1].

The I.P.R.S. Băneasa Full Line Condensed Catalog (1990) lists the βTDA2581 and βTDA2582, marked as preliminary data, as monolithic integrated circuits for controlling switched-mode power supplies (SMPS), with the drive for the horizontal deflection stage [1].

The catalog gives an operating temperature of −25…+70 °C (storage −55…+125 °C) and typical values of 12 V for the supply voltage, 15 mA for the supply current, 11 Vpp for the input horizontal drive pulse, 5 Vpp for the input flyback pulse and 6.1 V for the external reference voltage, a duty factor of the output pulse of 0…98 ± 0.8 %, a typical output voltage at IO < 20 mA (peak value) of 11.8 V and an output current (peak value) of at most 40 mA [1]. Pins (MP-117, top view): 1 phase detector output, 2 flyback pulse position input, 3 reference frequency input, 4 re-start count capacitor / remote control input, 5 slow start and transfer characteristic for low feedback, 6 over-current protection input, 7 over-voltage protection input, 8 feedback voltage input, 9 positive supply, 10 reference input, 11 output, 12 maximum duty factor adjustment / smoothing, 13 oscillator timing network, 14 reactance stage reference voltage, 15 reactance stage input, 16 negative supply (GND) [1].