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The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide range of applications. One of these . CT NTE Equvilent NTE 12V positive voltage regulator. NTE Integrated Circuit 3 Terminal Positive Voltage Regulator 12V 1A. NTE Data Sheet. CT Datasheet, CT PDF, CT Data sheet, CT manual, CT pdf, CT, datenblatt, Electronics CT, alldatasheet, free, datasheet.

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7812 12V 1A Voltage Regulator

Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. If so, what is the current like that it outputs? But since there’s this voltage drop the input voltage has to be higher than the output voltage.

The difference of 8W will be dissipated in the regulator.

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This is a snapshot of page 8: So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. If you have an input voltage of 20V the same 1A will be drawn from that 20V.

The datasheet does say how much it needs, but you may have to look for it. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts.

Since the output is 12 volts, you add the two together to get a minimum input of That means that when your load consumes 10W the switcher will only dissipate 1W. By using our site, you acknowledge that you have read and 8712ct our Cookie PolicyPrivacy Policyand our Terms of Service.


Linear regulators are different. The input voltage must be above the output. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

A note on dissipation: Home Questions Tags Users Unanswered. Peter Mortensen 1, 3 14 So if you have a 12W load dafasheet will draw 1A from the regulator.

This is a snapshot of page Sign up using Email and Password. Post as a guest Name. On page 6 of the datasheet, the maximum dropout voltage Vd is listed datahseet 2.

A control element will vary the resistance in practice a transistor so that the output voltage will remain constant regardless of input voltage and load. How does it go from a Maximum dropout voltage to a minimum input voltage?

How much higher depends on the type of regulator.

Voltage regulators basically can be divided in two big groups: Email Required, but never shown. The current to your load flows through the regulator and is the same current as will be drawn from the input voltage.

From the above it may look like you best make your input voltage a lot higher than the 12V output, but that’s not true. On the datasheet it doesn’t mention an input voltage.

From what i understand then from your answer All linear regulators have a minimum dropout voltageor difference.

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So the 20V delivers 20W, while the load only consumes 12W. Post Your Answer Discard By clicking “Post Your Answer”, 7821ct acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


A is a linear regulator, and does not step up the input voltage if the input is below the output for that you need a DC-DC boost regulator. Sign up or log in Sign up using Google. If we look further we can see two values for line regulation; it appears that this is best if the input voltage is at least 16V.

There are LDOs 7821ct Drop-Out which still can regulate the output if the input is only a few hundreds of mV higher and there are even ultra low drop-out types which only need a few tens of mV. An LDO might have a dropout voltage of 0. They are like a variable series resistor between input and output, causing a voltage drop across the regulator.

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I’ve seen LDOs with a dropout voltage of 50 mV. Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design. Dean 4, 22 57 Sign up using Facebook. All parameters are specified under certain conditions, and for the output voltage we can see that the condition is that the input voltage is minimum