U6084B

Features Pulse-width Modulation up to 2 kHz Clock Frequency Protection against Short-circuit, Load-dump Overvoltage and Reverse VS Duty-cycle 0 to 100% Continuously Output Stage for Power MOSFET Interference and Damage Protection According to VDE 0839 and ISO/TR 7637/1 Charge-pump Noise Suppressed Ground-wire Breakage Protection Description The U6084B is a PWM-IC with bipolar technology designed for the control of an N-channel power MOSFET used as a high-side switch. The IC is ideal for use in the brightness control (dimming) of lamps such as in dashboard applications. For constant brightness, the preselected duty-cycle can be reduced automatically as a function of the supply voltage. Figure 1. Block Diagram with External Circuit C5 16 9 Short circuit latch monitoring 5 RC oscillator 6 C1 Charge 13 pump PWM Logic 3 Control input Output 14 C3 47 nF 11 Current monitoring + short circuit detection 12 Rsh VBatt PWM Power Control with Automatic Duty-cycle Reduction U6084B VS 47 kΩ C2 Duty cycle range 0-100% Duty cycle reduction 4 Voltage monitoring 1 Enable/ disable 2 150 Ω R3 Ground Rev. 4677B–AUTO–02/04 Pin Configuration Figure 2. Pinning GND EN/DIS VI REDUCT NC OSC NC NC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VS NC OUTPUT 2 VS SENSE DELAY NC LATCH Pin Description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol GND EN/DIS VI REDUCT NC OSC NC NC LATCH NC DELAY SENSE 2VS OUTPUT NC VS Function IC ground Enable/disable Control input (duty cycle) Dut...