U2008B

U2008B Low-Cost Phase-Control IC with Soft Start 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 v 3 mA Applications D Low-cost motor control D Domestic appliance Block Diagram 22 kW/2W 230 V ~ R2 330 kW Load 7 Limiting detector Voltage detector 6 Mains voltage compensation R1 D1 BYT51K amax R8 1 MW Automatic retriggering Phase control unit ö = f (V3) U2008B 5 –VS C1 22 mF/ 25 V 4 GND TIC 226 R3 180 W 8 Current detector Supply voltage limiting Full wave load current detector Soft start 2 3 R10 100 kW + – Reference voltage Voltage monitoring 1 R14 47 kW P1 Set point R7 R6 ^ V(R6) = ±250 mV C3 3.3 nF C4 100 nF Load current compensation Figure 1. Block diagram with typical circuit: Load current sensing Rev. A4, 12-Jan-01 1 (10) U2008B Ordering Information Extended Type Number U2008B-x U2008B-xFP U2008B-xFPG3 Package DIP8 SO8 SO8 Remarks Tube Tube Taped and reeled 230 V ~ L R2 680 kW Load 22 kW/2W R1 D1 BYT51K amax R8 470 kW 6 Mains voltage compensation 7 Limiting detec...