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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. Post as a guest Name.

I’ve seen LDOs with a dropout voltage of 50 mV. So you 87012 find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. Since the output is 12 volts, you add the two together to get a minimum input of How much higher depends on the type of regulator.

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Sign up using Facebook. On the datasheet it doesn’t mention an input voltage. A note on dissipation: 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.

They are like datxsheet variable series resistor between input and output, causing a voltage drop across the regulator.

So if you have a 12W load it will draw 1A from the regulator. 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. Peter Mortensen 1, 3 14 On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. Email Required, but never shown.


Home Questions Tags Users Unanswered. From what i understand then from your answer 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 7812.

So the 20V delivers 20W, while the load only consumes 12W. That means that when your load consumes 10W the switcher will only dissipate 1W.

Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. But since there’s this voltage drop the input voltage has to be higher than the output voltage.

The input voltage must be above the output. 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. If so, what is the current like that it outputs? Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.

The datasheet does say how much it needs, but you may have to look for it. This is a snapshot of dtaasheet Sign up using Email and Password. All linear regulators have a minimum dropout voltageor difference.

EP Datasheet pdf – 78K/0 series emulation probe – NEC

The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. Dean 4, 22 57 Post Your Dagasheet 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.


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.

The maximum dropout voltage Vd is 2. Sign up or log in Sign up using Google. The difference of 8W will be dissipated in the regulator. If you have an input voltage of 20V the same 1A will be drawn from that 20V.

Voltage regulators basically can be divided in two big groups: This is a snapshot of page 8: An LDO might have a dropout voltage of 0. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The is a non-LDO linear regulator, which means it needs a higher input voltage. Linear regulators are different. 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 How does it go from a Maximum dropout voltage to a minimum input voltage?

The current to your load flows through the regulator datasheeg is the same current as will be drawn from the input voltage.