| Electronics > Beginners |
| Is there any advantage of Zener Diode as regulator over LDO other than BOM cost? |
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| bd139:
Fair points! :-+ |
| David Hess:
--- Quote from: bd139 on June 01, 2018, 12:57:26 pm ---Why would you use a zener for clamping though? You can get LDOs with clamps and overvoltage protection built in :-// --- End quote --- Which LDOs have clamps and overvoltage protection on their output? |
| coppice:
--- Quote from: bd139 on June 01, 2018, 12:57:26 pm ---Why would you use a zener for clamping though? You can get LDOs with clamps and overvoltage protection built in :-// --- End quote --- Can you name some of the parts you are thinking of? Most LDOs with extended features don't quite do what the headline seems to suggest, or require additional parts like a external current bypass FET. |
| dcarr:
Zener regulators also provide effective protection from reversed input polarity. A LDO might just go pop. |
| C:
Most are thinking that Voltage regulation is the main point, it might not be. People go crazy for voltage regulation, before doing this would be good to know the voltage range the load needs. It could very well be that noise isolation was the main reason to select the cheap zener. The isolation by the series resistor is bidirectional. This load from main supply or Main supply from this load. Think most will find that a resistor has a better frequency response then a LDO. And un like a LDO a zener is a change in load regulator. To state it a different way if you load current varies by 10% the zener is only regulating that 10% change. With a load change a LDO creates a load change on main supply. With a load change a zener creates a constant load on main supply. C |
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