NATIONAL SEMICONDUCTOR - LM3509 High Efficiency Boost for White LED's and/or OLED Displays with Dual Current Sinks I 2C Compatible Brightness Control handbook
Update: 28 September, 2023
The LM3509 is a high efficiency current mode boost converter designed for driving white LED's and/or OLED displays. It offers dual current sinks and I2C compatible brightness control. The LM3509 can be configured as a constant current sink for driving series white LED's or as a feedback pin to set a constant output voltage for powering OLED panels. When configured as a dual output white LED bias supply, it adaptively regulates the supply voltage of the LED strings to maximize efficiency and ensure the current sinks remain in regulation. The maximum current per output can be set via a single external low power resistor. The LED current in each output can be independently adjusted from 0 to max current in 32 exponential steps using the I2C compatible interface. When configured as a white LED + OLED bias supply, the LM3509 can independently and simultaneously drive up to 5 white LED strings and provide a constant output voltage of up to 21V for OLED panels. Output over-voltage protection shuts down the device if VOUT rises above 21V, allowing for the use of small sized low voltage output capacitors. The LM3509 is offered in a small 10-pin thermally enhanced LLP package and operates over the -40°C to +85°C temperature range.
Brand: National
File format: PDF
Size: 1688 KB
MD5 Checksum: 08C67DFB0BD5784691E55CBE37B26BBE
Publication date: 02 May, 2012
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