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minimum input voltage? – Electrical Engineering Stack Exchange
So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. On page 6 of the dataaheet, the maximum dropout voltage Vd is listed as 2. How much higher depends on the type of regulator.
Since the output is 12 volts, you add the two together to get a minimum input of Sign up or log in Sign up using Google. How does it go from a Maximum dropout datasheett to a minimum input voltage? They are like a variable series resistor between input and output, causing a voltage drop across the regulator. From what i understand then from your answer The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts.
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The difference of 8W will be dissipated in the regulator. 7812 maximum dropout voltage Vd is 2. An LDO might have a dropout voltage of 0. 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: Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated.
Sign dztasheet using Email and Password. Voltage regulators basically can be divided in two big groups: If you have an input voltage of 20V the same 1A will be drawn from that 20V.
This is a snapshot of page Dean 4, 22 57 Sign up using Facebook. 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 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. The is a 780122 linear regulator, which means it needs a higher input voltage. 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.
From the above it may look like you best make datasheeet input voltage a lot higher than the 12V output, but that’s not true. The current to your load flows through dqtasheet 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.