Diodes Inc has created a family of two-pin constant current chips that can work at up to 400V. Intended to control strings of LEDs running direct from rectifier mains, and called AL5890, it is available 10mA, 15mA, 20mA, 30mA, and 40mA variants “Its simple two-pin design means it can be inserted directly in the LED ...
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from Electronics Weekly https://www.electronicsweekly.com/news/products/led/two-pin-current-source-works-400v-leds-2018-05/
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