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LM3414HVMRX Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM3414HVMRX Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 20 page Block Diagram 30124820 Operation Description OVERVIEW The LM3414/14HV is a high power floating buck LED driver with wide input voltage ranges. It requires no external current sensing elements and loop compensation networks. The in- tegrated power N-MOSFET enables high output power with up to 1000 mA output current. The combination of Pulse Width Modulation (PWM) control architecture and the proprietary Pulse Level Modulation (PLM) guarantees accurate current regulation, good EMI performance and provides high flexibil- ity on inductor selection. High speed dimming control input allows precision and high resolution brightness control for ap- plications require fine brightness adjustment. Application Information SETTING THE SWITCHING FREQUENCY Both the LM3414 and LM3414HV are PWM LED drivers that contain a clock generator to generate constant switching fre- quency for the device. The switching frequency is determined by the resistance of an external resistor R FS in the range of 250 kHz to 1 MHz. Lower resistance of R FS results in higher switching frequency. The switching frequency of the LM3414/14HV is governed by the following equation: 11 www.national.com |
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