Diotec Products for Power LED Lamps – Halogen and CFL Retrofits Application Note
High current LEDs are considered the light source of the future. They offer a much higher efficiency than halogen lamps and this is where most of the initial products are positioned. Long term, they will also replace incandescent lightbulbs, compact fluorescent lamps (CFL) and even fluorescent lamps in tubes. At the moment there is still a cost premium associated with LED lamps and not all technical aspects about the colours are 100% resolved.
When replacing halogen light sources, the issues are straightforward. A 4/8W LED lamp has a similar light output as a 30/50W halogen lamp. They are also advertised as having a much longer life time – up to 50'000 hours – which compares very favourable with halogen light bulbs. There are two popular variations – with GU10 or MR16 (GU5.3) connections – depending whether they are operated on the mains or not. LED products used in lighting sources are typically 350mA or 700mA at the moment – in the future they may go up to 1A.
The preferred topology for driving Power LEDs at 110/230VAC mains at the low power levels is the Flyback converter. At 12VAC input anon-isolated topology such as a buck (step-down)converter can be used. The switching stage is nowadays available in various integrated versions; main active components to be added are further an input bridge, an output or free-wheeling rectifier and sometimes a snubber network. Those parts are introduced in this application note.
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GU10 、 MR16 、 GU5.3 、 TGL200F10 、 SK34SMA 、 S250 、 CS20S 、 SGL1-40 、 SK14 、 S500 |
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Bridge Rectifiers 、 Schottky Rectifiers 、 integrated snubber device |
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[ Power LED Lamps ][ Halogen ][ CFL ] |
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Application note & Design Guide |
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Please see the document for details |
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SMD;SMA |
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English Chinese Chinese and English Japanese |
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2011-02-02 |
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