Wide input voltage range power supply circuit
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United States of America Patent
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Feb 2, 2016
Grant Date -
May 16, 2013
app pub date -
Dec 7, 2011
filing date -
Nov 16, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A wide input voltage power supply circuit for a load includes a first stage and a second stage. The first stage includes a linear regulator circuit configured to maintain an output voltage at a predetermined output voltage level. The linear regulator includes an input for shutting the linear regulator off when an input voltage exceeds a predetermined shut off threshold. The second stage includes a high voltage detection circuit coupled to the input of the linear regulator. The high voltage detection circuit is configured to detect the level of the input voltage and to shut the linear regulator off when the input voltage exceeds the predetermined shut off threshold. An under voltage lockout circuit may be included, the under voltage lockout circuit configured to set a minimum turn-on voltage for the load.
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