U6083B

Features Pulse-width Modulation up to 2 kHz Clock Frequency Protection Against Short-circuit, Load Dump Overvoltage and Reverse VS Duty Cycle 18 to 100% Continuously Internally Reduced Pulse Slope of Lamp's Voltage Interference and Damage Protection According to VDE 0839 and ISO/TR 7637/1 Charge-pump Noise Suppression Ground-wire Breakage Protection Description The U6083B 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 use in brightness control systems (dimming) of lamps, for example, in dashboard applications. PWM Power Control IC with Interference Suppression U6083B Rev. 4770A–AUTO–11/03 Figure 1. Block Diagram with External Circuit VS 1 5 C5 Rsh 6 VBatt Current monitoring + short circuit detection C1 4 RC oscillator PWM Logic Control input Charge pump 7 C3 47 nF 8 47 kΩ 3 Duty cycle reduction GND 2 Output C2 Duty cycle range 18 to 100% Voltage monitoring Slew rate control 150 Ω R3 Ground 2 U6083B 4770A–AUTO–11/03 U6083B Pin Configuration Figure 2. Pinning DIP8 1 2 3 4 OUTPUT 2 VS SENSE DELAY VS GND VI OSC 8 7 6 5 Pin Description 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 3 4770A–AUTO–11/03 Functional Description Pin 1, Supply Voltage, VS or VBatt Overvoltage Detection Stage 1 If overvoltag...