78012 DATASHEET PDF

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The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. Email Required, but never shown.

The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. This is a snapshot of page 8: On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. Post as a guest Name.

Dean 4, 22 57 Sign up or log in Sign up using Google. 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 7802 is subject to these policies.

minimum input voltage? – Electrical Engineering Stack Exchange

Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design. Sign up using Facebook. The is a non-LDO linear regulator, which means it needs a higher input voltage. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of 7812privacy policy and cookie policyand that your continued use of the website is subject to these policies.

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How does it go from a Maximum dropout datashdet to a minimum input voltage? I’ve seen LDOs with a dropout voltage of 50 mV. Voltage regulators basically can be divided in two big groups: Sign up using Email and Password.

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 Home Questions Tags Users Unanswered.

A control element will vary the 780122 in practice a transistor so that the output voltage will remain constant regardless of input voltage and load. 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. That means that when your load consumes 10W the switcher will only dissipate 1W.

On the datasheet it doesn’t mention an input voltage. Peter Mortensen 1, 3 14 If so, what is the current like that it outputs?

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A note on dissipation: From what i understand then from your answer If you have an input voltage of 20V the same 1A will be drawn from that 20V.

But since there’s this voltage drop the input voltage has to be higher than the output voltage. This is a snapshot of page An LDO might have a dropout voltage of 0. So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.

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. 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. Linear regulators are different. They are like a variable series resistor between input and output, causing a voltage 778012 across the regulator. A is a linear regulator, and does not step up the input voltage if the ratasheet is below the output for that you need a DC-DC boost regulator.

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The maximum dropout voltage Vd is 2.

All linear regulators have a minimum dropout voltageor satasheet. Since the output is 12 volts, you add the two together to get a minimum input of The difference of 8W will be dissipated in the regulator.

So if you have a 12W load it will draw 1A from the regulator.

Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. 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.

The datasheet does say how much it needs, but you may have to look for it. How much higher depends on the type of regulator.

So the 20V delivers 20W, while the load only consumes 12W.