fixing a faulty light with powerful built in fan (awesome chip inside)

This light contained a chip I've not come across before. A super minimalist chip that operates at full mains voltage and replaces a lot of traditional circuitry. Bright Power S4523B.
Here's the datasheet (not https).
http://www.bpsemi.com/upload/cn/file/...

The LED driver is also a Bright Power chip with a super low component count. Notably the current sense resistor/s for setting the LED current and the overvoltage setting resistor for limiting the open circuit voltage. Sometimes the current sense resistor hack affects the overvoltage ratio and needs that resistor value tweaked too. Lowering the light power by even just 10% will have a significant effect on the longevity of the LEDs.

The circuitry was made somewhat harder to reverse engineer by the fan power supply chip probably being a clone, and with a very hard to find and extremely vague datasheet in Chinese that gave very little actual data on the chip.
Reverse engineering was made even harder by a rogue deviation from the vague design examples.

The fan runs at 9.5V and 330mA.


If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty.


#ElectronicsCreators