Using LM3530 evaluation kit

The LM3530 current mode boost converter supplies the power and controls the current in a series LED string of up to 40V. The 839 mA current limit and 2.7V to 5.5V input voltage range, makes the device a versatile backlight power source ideal for operation with Li+ batteries.

The LED current is adjustable from 0 to 29.5 mA via an I2C compatible interface. The 127 different current steps and 8 different maximum LED current levels (full scale LED current) gives a wide range of programmable LED currents. A PWM brightness control input allows for the backlight current to be a function of the brightness code and the PWM duty cycle. Two Ambient Light Sensor inputs are available to interface with two analog output ambient light sensors. These provide for the automatic adjustment of the LED current due to changes in the ambient light. Each ambient light sensor input has independently programmable internal voltage setting resistors which can be made high impedance to reduce power during shutdown.

View the PDF document for more information.

Originally published by Texas Instruments at www.ti.com as "LM3530 Evaluation Kit".