U2352B

U2352B PWM Power Control for DC Loads Description The U2352B bipolar circuit is a PWM device for controlling logic level Power MOSFETs and IGBTs. It allows simple power control for dc loads. Integrated load current monitoring with adjustable switch-off threshold also gives the option of measuring the load current via the MOS transistor’s on-state resistance, RDS(on), or via a shunt resistor. Special Features D Pulse width control up to 50 kHz clock frequency D Load current monitoring via the on-state resistance, RDS(on), of the FET or via shunt resistor (optional) Applications D D D D D D Battery-operated screwdrivers Battery-operated machine tools Halogen lamp controllers Dimmers Electronic fuses High-performance clock generators D 100 mA push-pull output stage D Voltage monitoring D Temperature-compensated supply voltage limitation D Chip temperature monitoring Package: DIP8, SO8 VS 2xI Chip temperature monitoring 140°C Reference voltage 8 VS S1 1 Oscillator Voltage limitation 6.8 V I – 2 K1 + Output stage logic Push-pull output stage 7 Time window current measurement 3 – K2 + Load current monitoring 4 S2 Q S Q R 6 GND POR 5 95 9670 Figure 1. Block diagram TELEFUNKEN Semiconductors Rev. A1, 29-May-96 1 (8) U2352B 2 (8) VB R1 VS 2xI Reference voltage D1 M Load S1 Oscillator Voltage limitation 6.8 V VS D2 D3 2 – K1 + Output stage logic Push-pull output stage 6 GND – K2 + Load current monitoring POR 5 *) R D 7 RG C2 3 Time window current measurement Q R ...