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Backside is metal disc with thermal paste between it and the metal mount to which it is screwed. Input is 6.75V 200mA.

What function does the PCB circuitry serve? Is it stepping down the voltage or limiting the current, or both?

Is U1 a current limiter? voltage regulator?

Is ZD1 a Zener Diode?

enter image description here

Here is an image from someone else: https://www.eevblog.com/forum/reviews/ikea-led-power-supply/enter image description here

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    \$\begingroup\$ The PCB substrate is probably aluminium to transfer heat to the metal heatsink. \$\endgroup\$ – Brian Drummond Feb 2 '18 at 10:42
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It's an LED driver, with regulation and constant current circuitry. U1 is a single IC LED driver and, yes, ZD1 is a Zener diode.

U1 is an AMC7136 low drop-out constant-current LED driver, or a clone of the AMC part.

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  • \$\begingroup\$ Who is AMC? I've been unable to trace that to mfr. \$\endgroup\$ – Mic Feb 2 '18 at 17:45
  • \$\begingroup\$ Far as I can tell, some local Chinese or Taiwan semiconductor shop. If you look on candlepower forums or budget light forums (flashlight fanatics) they all look for the manufacturer. On eevblog forums, they found this ic on an Ikea led product, with the datasheet. Just Google amc7136 datasheet and it's the first result. \$\endgroup\$ – Passerby Feb 2 '18 at 18:14
  • \$\begingroup\$ Thanks for the tips. What is represented by the second number on U1, 1674 in my case, 1511 in the eevblog case. Also in my case there appears to be a logo, and none in the eevblog case. FWIW, my pcb is from the ikea jansjo lamp too, with same power supply specs. eevblog.com/forum/reviews/ikea-led-power-supply \$\endgroup\$ – Mic Feb 2 '18 at 19:21
  • \$\begingroup\$ It's a date or lot code, used for the manufacturer to identify different batches of an IC. Maybe 2016, day/run 74. Nothing that you can use really. As for your logo, the same part can be manufactured by many different companies (that's what I meant by clone). \$\endgroup\$ – Passerby Feb 2 '18 at 19:30
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    \$\begingroup\$ "7136 led driver" is all I searched for. It would have been less of a guess if you had mentioned that it was from an Ikea lamp in the first place :P \$\endgroup\$ – Passerby Feb 2 '18 at 20:06

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