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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If so, what is the current like that it dataseet Post as a guest Name. All linear regulators have a minimum dropout voltageor difference. On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. So the 20V delivers 20W, while the load only consumes 12W.

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How does it go from a Maximum dropout voltage to a minimum input voltage?

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Sign up using Email and Password. A control element 78122ct vary the resistance in practice a transistor so that the output voltage will remain constant regardless of input voltage and load.

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. Since the output is 12 volts, you add the two together to get a minimum input of So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.


The input voltage must be above the output. A note on dissipation: But since there’s this voltage drop the input voltage has to be higher than the output voltage. The datasheet does say how much it needs, but you may have to look for it. Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. Dean 4, 22 57 They are like a variable series resistor between input and output, causing a voltage drop across the regulator.

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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.

So if you have a 12W load it will draw 1A from the regulator. The maximum dropout voltage Vd is 2. Linear regulators are different. From what i understand then from your answer Voltage regulators basically can be divided in two big groups: I’ve seen LDOs with a dropout voltage of 50 mV. The current to your load flows through the regulator and is the same current as will be drawn from the input voltage.


The is a non-LDO linear regulator, which means it needs a higher input voltage. How much higher depends on the type of regulator. An LDO might have a dropout voltage of 0.

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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 dahasheet 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.

Email Required, but never shown. This is a snapshot of page The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts.

A is a datasneet 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. This is a snapshot of page 8: On the datasheet it doesn’t mention an input voltage.

Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.

MCCT Datasheet pdf – 3-Terminal 1A Positive Voltage Regulator – Fairchild Semiconductor

The difference of 8W will be dissipated in the regulator. That means that when your load consumes 10W the switcher will only dissipate 1W. If you have an input voltage of 20V the same 1A will be drawn from that 20V.