U2008B

U2008B Low Cost Current Feedback Phase Control Circuit Description The U2008B is designed as a phase control circuit in bipolar technology. It enables load-current detection as well as mains-compensated phase control. Motor control with load-current feedback and overload protection are preferred applications. Features D Full wave current sensing D Mains supply variation compensated D Variable soft-start or load-current sensing D Voltage and current synchronization D Automatic retriggering switchable D Triggering pulse typ. 125 mA D Internal supply-voltage monitoring D Current requirement 3 mA v Applications D Low cost motor control D Domestic appliance Package: DIP8, SO8 Block Diagram 22 kW/2W 230 V ~ 330 kW Load 7 Limiting detector Voltage detector 6 Mains voltage compensation R2 R1 BYT51K D1 amax 1 MW 96 11643 R8 Automatic retriggering Phase control unit 5 TIC 226 R3 180W 8 Current detector –VS 22 mF/ 25 V C1 ö = f (V3) Supply voltage limiting 4 GND 1 Full wave load current detector Soft start 2 3 + – Reference voltage Voltage monitoring R14 47 kW R10 R6 ^ V(R6) = ±250 mV C3 3.3 nF C4 100 nF 100 kW Set point R7 P1 50 kW Load current compensation 12 kW Figure 1. Block diagram with typical circuit: Load current sensing TELEFUNKEN Semiconductors Rev. A1, 28-May-96 1 (10) U2008B 230 V ~ L 680 kW Load 7 Limiting detector Voltage detector 6 Mains voltage compensation R2 22 kW/2W R1 D1 BYT51K amax 470 kW 96 11644 R8 Automatic retriggering TIC 22...