特性
Flash LED Current up to 1A Among Full Power Supply Range
8 Flash LED Current Levels Selectable by 1-wire Interface:
100%*IFLASH, 90%*IFLASH……30%*IFLASH
2 Flash Timeout Levels Selectable by 1-wire Interface: 220ms, 1.3s
Ultra low RDSON: 0.4Ω(1X Mode), 2Ω(2X Mode)
PWM Dimming Control in Torch Mode
Automatic 1X/2X Mode Switchover
Up to 92% Efficiency in Torch Mode
Low 47mV Reference for Low Loss Sensing
Built-In Soft Start Limits Inrush Current
Over-Temperature Protection
Over-Voltage and Short-Circuit Protection
Low Ripple and EMI
Available in 3mm*3mm-10L DFN Package
说明
The AW3641E is a current-regulated charge pump ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for FLASH and TORCH modes.
The AW3641E incorporates a 1-wire interface to program the flash LED current at 8 levels and flash timeout at 2 levels.
The AW3641E supports PWM dimming to adjust the LED brightness during torch application by simply providing a PWM signal to FLASH pin.
The AW3641E features an ultra low RDSON, and automatically switches modes between 1X and 2X, not only ensuring that LED current does not depend on the forward voltage, but also optimizing the efficiency at the whole power supply and load range.
The AW3641E also features an automatic soft-start mode to limit inrush current, as well as over-temperature, over-voltage and short-circuit protection.
The AW3641E is available in a small 3mm*3mm DFN-10L package and is specified over the -40℃ to +85℃ ambient temperature range.
