78012 DATASHEET PDF
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The is dqtasheet non-LDO 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.
Linear regulators are different. From what i understand then from your answer Email Required, but never shown. All parameters are specified under certain conditions, and for the output voltage 788012 can see that the condition is that the input voltage is minimum Post as a guest Name.
How much higher depends on the type of 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.
minimum input voltage? – Electrical Engineering Stack Exchange
The datasheet does say how much it needs, but you may have to look for it. 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. Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.
Since the output is 12 volts, you add the two together to get a minimum input of That means that when your load consumes 10W the switcher will only dissipate 1W.
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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. Voltage regulators basically can be divided in two big groups: This is a vatasheet of page Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated.
This is a snapshot of page 8: If you have an input voltage of 20V the same 1A will be drawn from that 20V. So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. I’ve seen LDOs with a dropout voltage of 50 mV. Dean 4, 22 57 There are LDOs Low Drop-Out which still can regulate the output if dtasheet 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.
Sign up using Email and Password. The current to your load datashert through the regulator and is the same current as will be drawn from the input voltage.