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Zener diode - All About Circuits Given a zener of 4 7V with a knee current of 1mA and a maximum power dissipation of 1W Design a regulated power supply to deliver a load current ranging from 0 to 50 mA Given an AC Supply of 230 Vrms , 50 Hz Design an auxiliary Circuit which gives an output ranging from 8 to 8 4V i saw
Voltage clamping circuit with high power zener diode? No A zener diode alone will not work If the voltage exceeds the zener voltage, the zener diode will die a quick death followed by the gauge You need to put a resistor ahead of the zener diode and the gauge The gauge will still read the zener voltage, not zero
LTSpice zener diode 3V model - All About Circuits If you don't want to edit the standard dio file you can get a reasonable 3V zener model thus :- Place a diode symbol on your schematic Click 'Pick new diode' Click on an arbitrary low voltage zener diode Copy the highlighted text Paste it as a command on your schematic Edit the BV value to 3 0 Bear in mind that a real-world 3V zener diode doesn't have a very sharp voltage knee
Zener diodes - All About Circuits Most Zener diodes are avalanche diodes (those above 6V) and have a negative temperature coefficient Those below 6V are real zener diodes and have a positive temperature coefficient Around 6V the two effects cancel out and the voltage hardly changes with temperature
Zener knee current?? - All About Circuits Izk is the knee current of the zener diode When the current flowing into the zener is larger than the specified knee current, it will permit significant current flow in the reverse direction Izm is the maximum zener current the diode can handle without breaking It is often found by dividing the power rating (Pz) by the breakdown voltage (Vz)
voltage drop in zener diode - All About Circuits Zener diodes must be protected by an external resistor in all cases or the user risks a blown zener diode I disagree with Wayneh to a small degree, the zener voltage varies with the zener current, and thus a zener makes a poor regulator unless the zener current is fixed as is done in reference applications The zener voltage is temperature sensitive, so beware
Using zener diode for crowbar circuit | All About Circuits A zener diode isn't likely to work What you want is a TVS diode; essentially zener designed for a high surge current They usually short when they fail, which is what if you have a fuse before it There's a difference between a crowbar circuit and overvoltage protection A crowbar puts a short on the supply, overvoltage protection doesn't have to
Transistor as a Zener Diode - All About Circuits Only in this connection NPN transistor work as a Zener diode But the Zener voltage is not well defined This voltage will be in range between 6V up to 9V Depending on the type of transistor we use in the circuit So this BJT Zener diode is poor man's Zener diode So we almost never use it Sometime we use NPN transistor in ordinary diode
Max a zener can clamp - All About Circuits So this is almost a data sheet question I want to use a 12V zener to clamp a voltage to a max of 12V pretty standard This is hypothetical by the way Say i apply 13V to a 12V zener and it clamps to 12 Ok no problem The zener doesn't work so hard and does have to dissipate a lot of heat or
Using a zener as a means to create a voltage supply for an IC It's normal to allow a big multiple of the required current to flow through the resistor and the zener Eg if the supply to the chip was 100mA then the resistor is calculated to allow 500mA or more with most going through the zener This excess allows the zener to regulate the voltage as the demand of the IC fluctuates