* The eval board must be modified for 350mA output. The Transformer/Dual inductor and sense resistor(s).
This circuit is intended for driving high power LEDs, such as the Cree XLAMP™ series, Lumileds Luxeon™ Rebel and K2 and OSRAM, Golden and Platinum Dragon™ as well as the OSTAR™. It is designed for such wide input nominal 12 Vdc applications as automotive and low voltage lighting (12 Vdc/12 Vac). An optional dimming PWM input is included.
The circuit is based on NCP3065 operation at 250 kHz in a non-isolated configuration. The primary advantages of this circuit are in the wide input voltage range, wide output voltage range, and in its high efficiency.
A pulse feedback resistor (R8) is used to vary the slope of the oscillator ramp, achieving duty cycle control and steady switching frequency over a wide input voltage range.
| Manufacturer | onsemi |
|---|---|
| Category | Lighting |
| Sub-Category | LED Drivers - DC In |
| Eval Board |
Board not Stocked
|
| Voltage In |
8 ~ 25 V
|
| Topology |
Step Up/Down
|
| Current Out |
350 mA
|
| Voltage Out (Max) |
23 V
|
| Outputs and Type |
1 Non-Isolated
|
| Efficiency @ Conditions |
>80%, 8 ~ 15V in, 22Vf @ 350 mA
>75%, 8 ~ 20V in, 14Vf @ 350 mA |
| Features |
Dimming Control
Open Circuit Protection Short Circuit Protection |
| Switching Frequency |
250 kHz
|
| Component Count + Extras |
26 + 8
|
| Design Author |
ONSemiconductor
|
| Application / Target Market |
Automotive
Lighting: LED Home Lighting Lighting: LED Signage |
| Main I.C. Base Part |
NCP3065
|
| Date Created By Author | |
| Date Added To Library | 2011-09 |
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