Timeline for What is the purpose of a Zener diode added to the output of a SMPS?
Current License: CC BY-SA 3.0
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| when toggle format | what | by | license | comment | |
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| Sep 21, 2020 at 8:24 | comment | added | iouzzr | I agree on 2), for example if this power supply is powering some 5V logic IC, which usually has diode from IO to VDD. Any overvoltage on IO pins will introduce injection current which will ultimately flow into this 5V power supply. Usually power supply can only source current but not sink current. If this injection current is larger than all the current consumption on 5V network, it will introduce higher voltage on 5V rail, which will destroy all the components. Add this Zener will shunt this injection current. | |
| Nov 7, 2014 at 0:28 | vote | accept | Al Kepp | ||
| Nov 5, 2014 at 5:36 | history | answered | user02222022 | CC BY-SA 3.0 |