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On the datasheet it doesn’t mention an input voltage. A note on dissipation: A is a linear regulator, and does not step datasheeh the input voltage if the input is below the output for that you need a DC-DC boost regulator.
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. But since there’s this voltage drop the input voltage has to be higher than the output voltage. This is a snapshot of page 8: From what i understand then daatsheet your answer Post as a guest Name. How much higher depends on the type of regulator. The difference of 8W will be dissipated in the regulator.
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If you have an input voltage of 20V the same 1A will be drawn from that 20V. Sign up using Email and Password. The maximum dropout voltage Vd is 780112.
The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. How does it go from a Maximum dropout voltage to a minimum input voltage?
The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. The is a non-LDO linear regulator, which means it needs a higher input voltage.
Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.
If we look further we can see two values for line regulation; it appears that this is best daatasheet the input voltage is at least 16V. Home Questions Tags Users Unanswered.
So the 20V delivers datzsheet, while the load only consumes 12W. Voltage regulators basically can be divided in two big groups: Since the output is 12 volts, you add the two together to get a minimum fatasheet of So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. Sign up or log in Sign up using Google. All linear regulators have a minimum dropout voltageor difference.
So if you have a 12W load it will draw 1A from the regulator. That means that when your load consumes 10W the switcher will only dissipate 1W.
lm datasheet & applicatoin notes – Datasheet Archive
An LDO might have a dropout voltage of 0. I’ve seen LDOs with a dropout voltage of 50 mV. If so, what is the current like that it outputs? Dean 4, 22 57 The input ratasheet must be above the output. Peter Mortensen 1, 3 14 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. Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. They are like a variable series resistor between input and output, causing a voltage drop across the regulator.
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