U490B

U490B One-Shot Phase Control Description The monolithic integrated bipolar circuit, U490B, is a one-shot power control circuit, designed to control the thyristor which is mainly used in electric stapler devices. The IC is preferred to realise a one-shot phase control, where any phase angle and thus any intensity of the load voltage is adjustable. After successful triggering and the following delay time, an ignition pulse at the output is released. A further triggering is only possible after the elapse of the delay time. Features D D D D D L D1 1N4007 R1 Vmains 230 V 24 kW/ 2W R3 220 kW C3 1.5 nF Applications D Electric stapler devices Phase controlled thyristor ignition Triggering with time delay Repetition time delay Supply current x2 mA Package: DIP8, SO8 Mains supply via resistor S1 X C1 47 mF/ 10 V 8 VS 3 4 GND 95 10866 Start delay Supply stage Sync. Repetition delay Trigger control 2 C2 47 nF R2 220 kW N Load D2 Phase control POR Control input 5 R5 W 7 Output stage R7 33 W C7 22 nF Ramp 6 R4 220 W C4 47 nF/ 250 V X C5 150 nF [68 k 47 kW C6 150 nF Figure 1. Block diagram with external circuit TELEFUNKEN Semiconductors Rev. A1, 29-May-96 1 (6) U490B Pin Description NC 1 Trigger 2 8 VS 7 Output 6 Ramp 5 Contr Pin 1 2 3 4 5 6 7 8 Symbol NC Trigger Sync. GND Contr Ramp Output VS Function Not connected Triggering Synchronization Ground Control input Ramp Output Supply voltage Sync. 3 GND 4 Supply, Pin 8 Internal voltage limiter enables a simple sup...