LM3509中文资料用于白光 LED 和/或 OLED 显示屏的高效升压，具有双路电流阱数据手册TI规格书

描述 Description

The LM3509 current mode boost converter offers two separate outputs. The first output (MAIN) is a constant current sink for driving series white LED’s. The second output (SUB/FB) is configurable as a constant current sink for series white LED bias, or as a feedback pin to set a constant output voltage for powering OLED panels.All trademarks are the property of their respective owners.When configured as a dual output white LED bias supply, the LM3509 adaptively regulates the supply voltage of the LED strings to maximize efficiency and insure the current sinks remain in regulation. The maximum current per output is set via a single external low power resistor. An I2C compatible interface allows for independent adjustment of the LED current in either output from 0 to max current in 32 exponential steps. When configured as a white LED + OLED bias supply the LM3509 can independently and simultaneously drive a string of up to 5 white LED’s and deliver 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 WSON package and operates over the -40°C to +85°C temperature range.

特性 Features

• Integrated OLED Display Power Supply and LED Driver
• Drives up to 5 LED’s at 20mA and Delivers up to 21V at 40mA
• 32 Exponential Dimming Steps
• Internal Soft-Start Limits Inrush Current
• Wide 2.7V to 5.5V Input Voltage Range
• 1.27MHz Fixed Frequency Operation
• General Purpose I/O
• Active Low Hardware Reset