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.
Manufacturer | STMicroelectronics |
---|---|
Category | Lighting |
Sub-Category | LED Drivers - DC In |
Eval Board Part Number | 497-5516-ND |
Eval Board Supplier | STMicroelectronics |
Eval Board |
Board not Stocked
|
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 ~ 3V in, @ 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 |