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 |
India
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