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Eletrônica Aplicada
Em fontes chaveadas, o termistor NTC não está no circuito “por acaso”. Ele é responsável por limitar a corrente de partida (inrush current) no momento em que a placa é energizada. Quando a fonte é ligada, os capacitores do primário estão descarregados e se comportam praticamente como um curto instantâneo, gerando um pico de corrente muito elevado. O termistor atua aumentando temporariamente a resistência da entrada, reduzindo esse surto e protegendo: • Ponte retificadora • Fusível • Capacitor
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