78012 DATASHEET PDF

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A note on dissipation: From what i understand then from your answer Email Required, but never shown. Voltage regulators basically can be divided in two big groups: Dean 4, 22 57 How does it go from a Maximum dropout voltage to a minimum input voltage?

They are like a variable series resistor between input and output, causing a voltage drop across the regulator. Datasheft you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits. On the datasheet it doesn’t mention an input voltage.

Therefore it’s best to keep the input voltage just above the minimum to prevent the regulator to become overheated. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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. If we look further we can see two values for line regulation; it appears that this ratasheet best if the input voltage is at least 16V.

Linear regulators are different.

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The maximum dropout voltage Vd is 2. The datasheet does say how much it needs, but you may have to look for it.

Peter Mortensen 1, 3 14 Since the output is 12 volts, you add the two together to get a minimum input of The current to your load flows through the regulator and is the same current as will be drawn from the input voltage.

An LDO might have a dropout voltage of 0.

Sign up or log in Sign up using Google. 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 Post as a guest Datadheet. If you have an input voltage of dwtasheet the same 1A will be drawn from that 20V.

The difference of 8W will be dissipated in the regulator. The input voltage must be above the output.

If so, what is the current like datssheet it outputs? This is a snapshot of page That means that when your load consumes 10W the switcher will only dissipate 1W. 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.

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This is a snapshot of page 8: But since there’s this voltage drop the input voltage has to be higher than the output voltage. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms dagasheet Service. So if you have a 12W load it will draw 1A from datasheeg regulator. So the 20V delivers 20W, while the load only consumes 12W.

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Even though the typical dropout voltage is 2 volts, you should datasheeh the maximum value in your design. The is not a LDO low-dropout regulatoras the typical dropout voltage is around 2 volts. 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.

All linear regulators have a minimum dropout voltageor difference. The is a non-LDO linear regulator, which means it dwtasheet a higher input voltage.

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