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Most linear regulators have only a series-pass transistor to feed current to the load.

At the very least, while it doesn’t, the other one is going to idle. The input voltage datashdet monitored on an Oscope and never changed more than a handful of millivolt downward, but the output of his circuit was a flat topped high frequency pulse in the Hz range.

Voltage Regulator IC | Datasheet | Pin Diagram & Description

Getting rid of 10 W of heat is going to be more expensive and take more space than a buck switcher that makes 5 V from the input voltage directly. Could you please explain a bit more, why the loosing regulator does not generate current?


You used “might” three times. On the other hand, if 9V is given as input at the same amount of load:. Let’s say the input voltage is only 8. By clicking “Post Dataxheet 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.

So, we now have 2 options. You have entered an incorrect email address! That times the 2.

And what exactly happens if one regulator is inevitably a little higher in voltage than the other? Email Required, but never shown. I’ve seen it work. A lot of energy is wasted in the form of heat.

The circuit in purple provides protection against datashee Q13excessive datazheet voltage Q19 and excessive output current Q This change is amplified by Q7 and Q8, generating the error output. The greater the difference between the input and output voltage, more the heat generated. The heart of the IC is a transistor Q16 that controls the current between the input and output and thus controlling the output voltage.


A switcher would probably be a better solution.

All About IC 7805 | Voltage Regulator

On the other hand, energy actually being used is:. So are they all doing it wrong? However here is a way to effectively increase the current capability of a single linear regulator:. What is impact due to current in these cases datashewt. You can’t assume there can be two exactly identical chips. This closes the negative feedback loop controlling the output voltage.

At low currents, there is little voltage across R1. The xx in 78xx indicates the output voltage it provides. This pin is neutral for equally the input and output.

It is unwise to assume that because the current requirements are high, a switcher should be used. The drawback of this is the extra voltage drop across R1. A resource for professional design engineers.

If the output voltage is correct 5Vthen the voltage divider provides 3. Thanks for the details. Please link the datasheet you are referring to.