LM2755TM评估板是在芯片LM2755TM基础上进行开发和评估。该LM2755是一个电荷泵型，恒流LED驱动器可驱动3个LED，总输出电流高达90mA。The LM2755 is a charge-pump-based, constant current LED driver capable of driving 3 LEDs with a total output current up to 90mA. The diode current waveforms of each LED can be trapezoidal with timing and level parameters (rise time, fall time, high level, low level, delay, high time, low time) programmed via an I2 C compatible interface. The 32 brightness levels found on the LM2755 are exponentially spaced (as opposed to linearly spaced) to better match the response of the human eye to changing brightness levels.The LM2755 evaluation board is designed to display the functionality of the LM2755. With a charge-pump-based boost converter, and three highly programmable constant current LED drivers, the LM2755 is ideal for driving RGB LEDs. The timing and level parameters (rise time, fall time, high level, low level, delay, high time, low time) of each LED can be programmed to create a large number of different color and lighting schemes. The LM2755 is available in TI's 18-bump ? SMD package.特性
90% Peak Efficiency
Total solution size < 13mm2
No Inductor Required: Only 4 Inexpensive Ceramic Caps
3 Independently Controlled Constant Current Outputs
Programmable Trapezoidal Dimming Waveform on Each Output
Programmable Timing Control Via Internal Registers and External Clock Synchronization Input
32 Exponential Dimming Steps with 800:1 Dimming Ratio
Programmable brightness control via I2C compatible interface
Hardware Enable Pin
Wide input voltage range: 2.7V to 5.5V
Tiny 18-bump thin micro SMD: 1.8mm x 1.6mm x 0.6mm
#板卡评测
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2014-01-10
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