厂商：Freescale
类别：16位单片机
厂商：Murata
类别：DC/DC 转换器
厂商：Linear
类别：高速放大器
厂商：Panasonic
类别：PhotoMOS(MOSFET输出光电耦合器)
厂商：Littelfuse
类别：晶闸管
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特点True Color PWM? Dimming Delivers Constant LED Color with Up to 3000:1 RangeWide Input Voltage Range: 2.8V to 36V4.5A, 60mΩ, 42V Internal SwitchDrives LEDs in Boost, Buck-Boost or Buck ModesIntegrated Resistors for Inductor and LED Current Sensing Program LED Current: ? 100mA to 1050mA (LT3478-1) ? (10mV to 105mV)/RSENSE (LT3478) Program LED Current De-Rating vs TemperatureSeparate Inductor Supply InputInrush Current ProtectionProgrammable Soft-StartFixed Frequency Operation from 200kHz to 2.25MHzOpen LED Protection (Programmable OVP)Accurate Shutdown/UVLO Threshold with Programmable Hysteresis16-Pin Thermally Enhanced TSSOP Package典型应用典型应用描述The LT3478-1 reduces external component count and cost by integrating the LED current sense resistor. The LT3478 uses an external sense resistor to extend the maximum programmable LED current beyond 1A and also to achieve greater accuracy when programming low LED currents. Operating frequency can be set with an external resistor from 200kHz up to 2.25MHz. Unique circuitry allows a PWM dimming range up to 3000:1 while maintaining constant LED color. The LT3478/LT3478-1 are ideal for high power LED driver applications such as automotive TFT LCD backlights, courtesy lighting and heads-up displays. One of two CTRL pins can be used to program maximum LED current. The other CTRL pin can be used to program a reduction in maximum LED current vs temperature to maximize LED usage and improve reliability.Additional features include inrush current protection, programmable open LED protection and programmable soft-start. Each part is available in a 16-pin thermally enhanced TSSOP Package.