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From what i understand then from your answer How does it go from a Maximum dropout voltage to a minimum input voltage? Voltage regulators basically can be divided in two big groups: 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.
Email Required, but never shown. Post as a guest Name. 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.
lm datasheet & applicatoin notes – Datasheet Archive
On the datasheet it doesn’t mention an input voltage. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.
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Dean 4, 22 57 The difference of 8W will be dissipated in the 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.
The input voltage must be above the output.
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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. This is a snapshot of page 8: The datasheet does say how much it needs, but you may have to look for it. An LDO might have a dropout voltage of 0. So the 20V delivers 20W, while the load only consumes 12W.
Linear regulators are different. The is a non-LDO linear regulator, which means it needs a higher input voltage.
EP Datasheet pdf – 78K/0 series emulation probe – NEC
I’ve seen LDOs with a dropout voltage of 50 mV. If so, what is the current like that it outputs? This is a snapshot of page The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. A note on dissipation: They are like a variable series resistor between input and output, causing a voltage drop across the regulator.
All linear regulators have a minimum dropout voltageor difference. Sign up using Email and Password. Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. 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.
So if you have a 12W load it will draw 1A from the regulator. The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. If you have an input voltage of 20V the same 1A will be drawn from that 20V. 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.
How much higher depends on the type of regulator.
That means that when your load consumes 10W the switcher will only dissipate 1W. Home Questions Tags Users Unanswered.
So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. Peter Mortensen 1, 3 14 But since there’s this voltage drop the input voltage has to be higher than the output voltage. Since the output is 12 volts, you add the two together to get a minimum input of 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 Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.
The maximum dropout voltage Vd is 2.