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LM3492-Q1

具有升壓轉換器和快速電流調節(jié)器的汽車類 2 通道獨立可調光 LED 驅動器; ? Boost Converter: \n? LM3492-Q1 is an Automotive Grade Product That is AEC Q100 Grade 1 Qualified\n? Very Wide Input Voltage Ranged From 4.5 V to 65 V\n? Programmable Soft Start\n? No Loop Compensation Required\n? Stable With Ceramic and Other Low ESR Capacitors With No Audible Noise\n? Nearly Constant Switching Frequency Programmable From 200 kHz to 1 MHz\n \n? Current Regulators: \n? Programmable LED Current from 50 mA to 200 mA\n? 1000:1 Contrast Ratio at a Dimming Frequency of More Than 3 kHz, Minimum LED Current Pulse Width is 300 ns\n? Two Individual Dimmable LED Strings up to 65 V, Total 15 W (Typically 28 LEDs at 150 mA)\n? Dynamic Headroom Control Maximizes Efficiency\n? Over-Power Protection\n? ±3% Current Accuracy\n \n? Supervisory Functions: \n? Precision Enable\n? COMM I/O Pin for Diagnostic and Commands\n? Thermal Shutdown Protection\n? Thermally Enhanced 20-Pin HTSSOP package;

The LM3492/-Q1 integrates a boost converter and a two-channel current regulator to implement a high efficient and cost effective LED driver for driving two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary Projected-On-Time control method to give a fast transient response with no compensation required, and a nearly constant switching frequency programmable from 200 kHz to 1 MHz. The application circuit is stable with ceramic capacitors and produces no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up, and an integrated 190 mΩ, 3.9-A N-Channel MOSFET switch minimizes the solution size.\n\nThe fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 1000:1 at a dimming frequency of more than 3 kHz. The LED current is programmable from 50 mA to 200 mA by a single resistor.\n\n To maximize the efficiency, Dynamic Headroom Control (DHC) automatically adjusts the output voltage to a minimum. DHC also facilitates a single BOM for different number of LED in a string, which is required for backlight panels of different size, thereby reducing overall development time and cost. The LM3492/-Q1 comes with a versatile COMM pin which serves as a bidirectional I/O pin interfacing with an external MCU for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the LM3492/-Q1 include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The LM3492/-Q1 is available in the thermally enhanced 20-pin HTSSOP package.

LM3492-Q1

Two-Channel Individual Dimmable LED Driver