I've been tearing downfaile LED lamps and the latest is the most interesting but the most puzzling. This is a dimmable 6W BC with impressive heatsinking, branded Lemnis Lighting. The highly sophisticated controller contains 2 bridge rectifiers on the AC input, 2 ferrite transformers a TI UCC28600 controller, a 358 dual opamp, an optocoupler, a power MOSFET and several discrete SM transistors and passives. No crumby capacitor-based current limiter here!
But strangest of all is the luminous head, shown in the first photo. Instead of the usual array of 5050 (or smilar) LED packages we have just 4 COB LEDs, plus 2 other copper-coloured COB devices with just 2 wire bonds each and a transparent covering. There are just 2 connections from the luminous head to the controller.
I'm completely stumped as to what the copper-coloured chips could be. They don't look at all like LED chips. If they were for thermal or luminoous monitoring they'd need their own connections to the controller. Any ideas?
But strangest of all is the luminous head, shown in the first photo. Instead of the usual array of 5050 (or smilar) LED packages we have just 4 COB LEDs, plus 2 other copper-coloured COB devices with just 2 wire bonds each and a transparent covering. There are just 2 connections from the luminous head to the controller.
I'm completely stumped as to what the copper-coloured chips could be. They don't look at all like LED chips. If they were for thermal or luminoous monitoring they'd need their own connections to the controller. Any ideas?
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