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The datasheet does say how much it needs, but you may have to look for it. Peter Mortensen 1, 3 14 From what i understand then from your answer How much higher depends on the type of regulator.
Sign up or log in Sign up using Google. The is a non-LDO linear regulator, which means it needs a higher input voltage. datzsheet
On datwsheet 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. Post as a guest Name. So the 20V delivers 20W, while the load only consumes 12W.
A note on dissipation: The difference of 8W will be datsaheet in the regulator.
From the datashdet it may look like you best make your input voltage a lot higher than the 12V output, but that’s not true. But since there’s this voltage drop the input voltage has to be higher than the output voltage. Dean 4, 22 57 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 Since the output is 12 volts, you add datassheet two together to get a minimum input of Home Questions Tags Users Unanswered.
The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. That means that when your load consumes 10W the switcher will only dissipate 1W.
A control element will vary datawheet resistance in practice a transistor so that the output voltage will remain constant regardless of input voltage and load. The maximum dropout voltage Vd is 2. Sign up using Email and Password.
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The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. 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. All linear regulators have a minimum dropout voltageor difference. 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 a variable series resistor between input and output, causing a voltage drop across the regulator.
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How does it go from a Maximum dropout voltage to a minimum input voltage? Sign up using Facebook. This is a snapshot of page 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. So if you have a 12W load it will draw 1A from the regulator. I’ve seen LDOs with a dropout voltage of 50 mV. Email Required, but never shown. On the datasheet it doesn’t mention an input voltage.
So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. Linear regulators are different.
Voltage regulators basically can be divided in two big groups: An LDO might have a dropout voltage of 0. Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated.
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