3.3V Low-Cost Non-Isolated Offline Converter for Smart E-Meters Reference Design (PMP9310)

The PMP9310 is an offline converter that supplies 3.3VDC output at up to 132mA. It is used for 50Hz single-phase smart e-meters where maximum allowable input apparent power is regulated (typically 4VA) and galvanic isolation is unnecessary. It solves the problem of limited available output power typically seen in a linearly regulated output stage. By employing the wide input LM5017 buck switcher, the capacitor-drop design sets the input of the DC-DC stage at a high value of 72V and extracts significantly more power from the mains at a given input apparent power. The extra available output power supports a system design that incorporates extra functionalities.

Возможности

85V-230V 50Hz AC input, 3.3V DC output 10mA output at 85V input, and 132mA output at 230V input 1.68VA apparent input power @ 120VAC in and 33mA out 6.6VA input apparent power @ 230VAC in and 132mA out Up to 54% overall power efficiency

Файлы

Схемы и диаграммы

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Тесты и симуляция

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Печатные платы и ПО

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Спецификация (BOM)

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3.3V Low-Cost Non-Isolated Offline Converter for Smart E-Meters Reference Design PMP9310