This application note is dedicated to the STLD40D, it's a boost converter that operates from 3.0V to 5.5Vdc and can provide an output voltage as high as 37Vdc and can drive up to 10 white LEDs in series, at 20mA.
The converter is a PFM ( Pulse Frequency Modulation) inductor switcher and can work in discontinuous (DCM) as well as Continuous (CCM) Mode operation. The regulation is done by sensing the LED current through resistor RLED.
The device can be turned ON/OFF through the logic enable signal pin EN. By applying a low frequency PWM signal the WLEDs can be dimmed.
| Manufacturer | STMicroelectronics |
|---|---|
| Category | Lighting |
| Sub-Category | LED Drivers - DC In |
| Eval Board Part Number | 497-6260-ND |
| Eval Board Supplier | STMicroelectronics |
| Eval Board |
Board not Stocked
|
| Voltage In |
3 ~ 5.5 V
|
| Topology |
Step Up
|
| Current Out |
20 mA
|
| Voltage Out (Max) |
37 V
|
| Outputs and Type |
1 Non-Isolated
|
| Efficiency @ Conditions |
>80%, 5.5V in, 10 LEDs @ 20 mA
>75%, 3V in, 10 LEDs @ 20 mA |
| Features |
Dimming Control
Open Circuit Protection Over Current Protection Over Voltage Protection Shutdown, Enable, Standby Thermal Protection |
| Switching Frequency |
- Not Given
|
| Component Count + Extras |
7 + 4
|
| Design Author |
STMicroelectronics
|
| Application / Target Market |
Cell Phones
Garden Light LCD Backlighting Portable Devices USB Powered Devices |
| Main I.C. Base Part |
STLD40D
|
| Date Created By Author | |
| Date Added To Library | 2011-03 |
Austria
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