Ac-dc PSU stand-by power can be as low as 10mW with STMicroelectronics’ STCH03 off-line power controller, aimed at mobile chargers, power adapters and auxiliary supplies. Energy-saving features include ‘zero-power’ high-voltage start-up circuitry, as well as burst-mode switching when the load is very low or disconnected (see below), are intended to help chargers meet legislation such ...
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from Electronics Weekly https://www.electronicsweekly.com/news/products/power-supplies/ac-dc-charger-idles-10mw-coc-tier-2-2018-06/
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