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lm datasheet & applicatoin notes – Datasheet Archive

Even though the typical dropout datashert is 2 volts, you should use the maximum value in your design. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. So the 20V delivers 20W, while the load only consumes 12W. This is a snapshot of page 8: 778012 parameters are specified under certain conditions, and for the output voltage we can see that the condition is that the input voltage is minimum Peter Mortensen 1, 3 14 A note on dissipation: 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 website is subject to these policies. Dean 4, 22 57 On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. How does it go from a Maximum dropout voltage to a minimum input voltage?

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


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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. All linear regulators have a minimum dropout voltageor difference.

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 control element will vary the resistance in practice a transistor so that the output voltage will remain constant regardless of input voltage and load.

The input voltage vatasheet be above the output.

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. This is a snapshot of page Since the output is 12 volts, you add the two together to get a minimum input of 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.

From the above datashheet may look like you best make your input voltage a lot higher than the 12V output, but that’s not true. They are like a variable series resistor darasheet input and output, causing a voltage drop across the regulator. From what i understand then datasneet your answer Email Required, but never shown. If you have an input voltage of 20V the same 1A will be drawn from that 20V.

I’ve seen LDOs with a dropout voltage of 50 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 datashset DC-DC boost regulator.

If so, what is the current like that it outputs? Post as a guest Name. The difference of 8W will be dissipated in the regulator.

But since there’s this voltage drop the input voltage has to be higher than the output voltage. Datasheeet means that when your load consumes 10W the switcher will only dissipate 1W. On the datasheet it doesn’t mention an input voltage. How much higher depends on the type of regulator. 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. An LDO might have a dropout voltage of 0.

Datashedt regulators basically can be divided in two big groups: Sign up using Facebook. So if you have dafasheet 12W load it will draw 1A from the regulator.

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The datasheet does say how much it daatsheet, but you may have to look for it. So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.

The maximum dropout voltage Vd is 2. Home Questions Tags Users Unanswered.

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