U6081B

U6081B PWM Power Control with Low Duty Cycle Switch Off Description U6081B is a PWM IC in bipolar technology for the control of an N-channel power MOSFET used as a high side switch. The IC is ideal for the use in the brightness control (dimming) of lamps e.g., in dashboard applications. Features D Pulse width modulation up to 2 kHz clock frequency D Protection against short circuit, load dump overvoltage and reverse VS D Interference and damage protection according to VDE 0839 and ISO/TR 7637/1. D Duty cycle 0 to 100% D Output stage for power MOSFET D Ground wire breakage protection D Charge pump noise suppressed Ordering Information Extended Type Number U6081B Package DIP8 Remarks Block Diagram VS 1 5 Current monitoring + short circuit detection Charge pump 6 C5 Rsh VBatt C1 47 kW 4 RC oscillator PWM Logic Control input 7 C3 47 nF 8 Output C2 3 Duty cycle range 0/13 to 100 % 2 Voltage monitoring 95 9752 150 W R3 Ground Figure 1. Block diagram with external circuit TELEFUNKEN Semiconductors Rev. A1, 14-Feb-97 1 (8) U6081B Pin Description VS GND VI Osc 1 2 3 4 95 9944 8 7 6 5 Output 2 VS Sense Delay Pin 1 2 3 4 5 6 7 8 Symbol VS GND VI Osc Delay Sense 2 VS Output Function Supply voltage VS IC ground Control input (duty cycle) Oscillator Short circuit protection delay Current sensing Voltage doubler Output Functional Description Pin 1, Supply Voltage, Vs or VBatt Overvoltage Detection Stage 1: If VBatt > 20 V occurs the external transistor will be s...