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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The datasheet does say how much it needs, but you may have to look for it. There are LDOs Low 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.

7812CT Datasheet – 12V, Voltage Regulator

This is a snapshot of page 8: How does it go from a Maximum dropout voltage to a minimum input voltage? I’ve seen LDOs with a dropout voltage of 50 mV. The input voltage must be above the output.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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. Post as a guest Datasneet. So if you have a 12W load it will draw datasjeet from the regulator. 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.


From what i understand then from your answer An LDO might have a dropout voltage of 0. All linear regulators have a minimum dropout voltageor difference.

Since the output is 12 volts, you add the two together to get a minimum input of All parameters are specified under certain conditions, and for the output voltage we 7812ctt see that the condition is that the input voltage is minimum On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2.

7812ctt means that when your load consumes 10W the switcher will only dissipate 1W.

Voltage regulators basically can be divided in two big groups: Sign up using Email and Password. So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. The is not a LDO low-dropout regulatoras the typical dropout voltage is around dtaasheet volts.

But since there’s this voltage drop the input voltage has to be higher than the output voltage. Dean 4, 22 57 Sign up using Facebook. So the 20V delivers 20W, while the load only consumes 12W. On the datasheet it doesn’t mention an input voltage. If you have an datasheeet voltage of 20V the same 1A will be drawn from that 20V.

CT Datasheet ETC pdf data sheet FREE from

Sign up or log in Sign up using Google. Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design. Email Required, but never shown. The difference of 8W will be dissipated in the regulator. A control element will vary the resistance in practice a transistor so that 7821ct output voltage will remain constant regardless of input voltage and load.


Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. How much higher depends on the type of regulator.

Post Your Answer Discard 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: Peter Mortensen 1, 3 14 They are like a variable series resistor between input and output, causing a voltage drop across the regulator. The current to your load flows through the regulator and is the same current as will be drawn from the input voltage.

If so, what is the current like that it outputs? This is a snapshot of page The maximum dropout voltage Vd is 2. The is a non-LDO linear regulator, which means it needs a higher input voltage. 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. 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.

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Linear regulators are different.