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* Current fold-back limiting, often called "foldback": limits the short circuit current to a very small value, half or less of the rated load current. Foldback reduces the output current linearly as output voltage decreases. ([https://electronics.stackexchange.com/questions/2931/what-is-foldback-short-circuit-protection-in-a-power-supply 'What is "foldback short circuit protection" in a power supply?'])([http://www.ti.com/lit/an/snva736/snva736.pdf "Know Your Limits: TI application report"])
 
* Current fold-back limiting, often called "foldback": limits the short circuit current to a very small value, half or less of the rated load current. Foldback reduces the output current linearly as output voltage decreases. ([https://electronics.stackexchange.com/questions/2931/what-is-foldback-short-circuit-protection-in-a-power-supply 'What is "foldback short circuit protection" in a power supply?'])([http://www.ti.com/lit/an/snva736/snva736.pdf "Know Your Limits: TI application report"])
 
* Use a "intelligent switch"[http://www.st.com/ips][http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00003916.pdf][http://www.irf.com/product-info/ips/] that automatically turns itself off if it gets too close to failure.
 
* Use a "intelligent switch"[http://www.st.com/ips][http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00003916.pdf][http://www.irf.com/product-info/ips/] that automatically turns itself off if it gets too close to failure.
 
== history of switching power supplies ==
 
 
 
"A key developer of switching power supplies was Robert Boschert, who quit his job and started building power supplies on his kitchen table in 1970."
 
<ref>
 
Ken Shirriff. [http://www.righto.com/2012/02/apple-didnt-revolutionize-power.html "Apple didn't revolutionize power supplies; new transistors did"].
 
</ref>
 
 
 
Rod Holt designed the switching power supply for the 1977 Apple II.
 
1978 patent US4130862.
 
 
  
 
== further reading ==
 
== further reading ==

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