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