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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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But since there’s this voltage drop the input voltage has to be higher than the output voltage. Sign up using Email and Password. Email Required, but never shown. If you have an input voltage of 20V the same 1A will be drawn from that 20V.

CT Datasheet PDF – Motorola => Freescale

The input voltage must be above the output. On the datasheet it doesn’t mention an input voltage. Home Questions Tags Users Unanswered. This is a snapshot of page 8: The datasheet does say how much it needs, but you may have to look for it. 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 So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.

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. All linear regulators have a minimum dropout voltageor difference. 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.


A note on dissipation: The maximum dropout voltage Vd is 2. So if you have a 12W load it will draw 1A from the regulator. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design. I’ve seen LDOs with a dropout voltage of 50 mV.

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.

On dattasheet 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. The current to your load flows through the regulator and is the same current as will be drawn from the input voltage.

Sign up or log in Sign up using Google. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. This is a snapshot of page Since the output is 12 volts, you add the two together to get a minimum input of 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 781ct policies.

Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. Linear regulators are different. How much higher depends on the type of regulator. From what i understand then from your answer Sign up using Facebook. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy 7812tc cookie policyand that your continued use of the website is subject to these policies.


If so, what is the current like that it outputs? How does it go from a Maximum dropout voltage to a minimum input voltage? They are like a variable series resistor between input datawheet output, causing a voltage drop across the regulator.

Dean 4, 22 57 That means that when your load consumes 10W the switcher dataeheet only dissipate 1W. 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.

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.

(PDF) 7812CT Datasheet download

Voltage regulators basically can be divided in two big groups: Post as a guest Name. The dwtasheet of 8W will be dissipated in the regulator. An LDO might have a dropout voltage of 0. So the 20V delivers 20W, while the load only consumes 12W.

The is a non-LDO linear regulator, which means it needs a higher input voltage. Peter Mortensen 1, 3 14