Order Number LMCT. LMCT or LMCT. See NS Package Number T03B. C National Semiconductor Corporation. RRD-B30M Printed in. Semiconductors – IC – Integrated circuits – Power Management – Stabilizers FIX. Image: Click to enlarge. SOT23*LM National Semiconductor => TI. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright , Texas Instruments Incorporated.

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Please help improve this article by adding citations to reliable sources. The transformer’s output on the above picture is 12V, then 2 diodes take 0. The 78xx line are positive voltage regulators: Reports of the death of the may be premature: Use an LM if possible – datasheet here. natiojal


Russell McMahon k 9 First some shocking news: Like Russell says, you can protect the output against overvoltage by placing a power diode semiconfuctor output and input, cathode to the input. But we don’t know its value so we are unable to say what will be the exact output voltage when using the design on the first image. I expect there actually is some resistor insideso R1 is not required to let it work.

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The is the most common, as its regulated 5-volt supply provides a convenient power source for most TTL components. Wow, when did LM become obsolete? Sign up using Email and Password. How can this give 15 Volt output? Good news for China btw: I am asking because it doesn’t correspond to the the datasheet: You’ll also have to account for the ripple across the smoothing capacitor.

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January Learn how and when to remove this template message. Wikimedia Commons has media related to 78xx Series and Voltage regulator circuits. Email Required, but never shown. Sign up using Facebook. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policynatioal that your continued use of the website is subject to these policies.

I think you answered part of your own question: A can be used in semivonductor adjustable mode as per the diagram you provided – using R1 and R2, BUT it is not a good regulator to use this way as it draws substantial and variable current via its adj ground usually pin which leads to poor regulation. 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.


There is a related line of 79xx devices which are complementary negative voltage regulators. You’ll be able to regulate from 1.

You’re right about the voltage drops, though I would calculate with 1V per diode. Ground is connected to your mains! From Wikipedia, the free encyclopedia.

In other projects Wikimedia Commons. Industrial Electronics and Control. Notice that this circuit is not isolated from the AC line! That’s right, the standard linear regulator since many moons.

Views Read Edit View history. What I miss there is R1. This page was last edited on 5 Decemberat My second question goes here: There is no need to connect the mains side of the transformer to circuit ground.

78xx – Wikipedia

This means your regulator won’t go higher than By using this site, you agree to the Terms of Use and Privacy Policy. Fig 5 in the datasheet is the same effectively as above but the reference voltage is 1. Al Kepp 1, 5 19

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