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STEVAL-ILL008V1: 1 LED @ 280mA, 0.6 ~ 5.5V in

Summary

The L6920D is used in this flashlight application as it is a high efficiency step-up controller that realizes the conversion from battery voltage to the selected output voltage with only three external components.

L6920D has a startup voltage of 1V and its operating input voltage ranges from 0.6V to 5.5V.

The circuit is configured as a constant current source in boost topology to drive one 350mA (typical) 1W LED.

Specifications

Manufacturer	STMicroelectronics
Category	Lighting
Sub-Category	LED Drivers - DC In
Eval Board Part Number	497-5516-ND
Eval Board Supplier	STMicroelectronics
Eval Board	ABC
Voltage In	1 ~ 5.5 V
Topology	Step Up
Current Out	30 mA 275 mA
Voltage Out (Max)	4 V
Outputs and Type	1 Non-Isolated
Efficiency @ Conditions	>95%, 2.6 ~ 3V in, @ 30 mA >75%, 1.9 ~ 3 Vin, @ 275 mA
Features	Low Battery Warning Reverse Polarity Protection Shutdown, Enable, Standby
Switching Frequency	250 kHz
Component Count + Extras	12 + 1
Design Author	STMicroelectronics
Application / Target Market	Flashlight / Torch
Main I.C. Base Part	L6920D
Date Created By Author
Date Added To Library	2011-03