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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The 78xx line are positive voltage regulators: It is a component in switching regulator designs and is not a linear regulator like other 78xx devices.

And my third question: Wow, when did LM become obsolete? Encyclopedia of Electronic Components Volume 1: This is the first I’ve seen of consolidation between TI and National part numbers, but you knew it had to come nationao or later.

How can this give 15 Volt output? As you noted you can’t go all the way to 15V, though your calculation contains an error: You’re right about the voltage drops, though I would calculate with 1V per diode.


The is the most common, as its regulated 5-volt supply provides a convenient semicondkctor source for most TTL components. 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.

First some shocking news: What I miss there is R1. The seems to me like a LM with those R1 and R2 added inside. My life will never be the same again: Sign up using Facebook. I found this design on internet: Notice that this circuit is not isolated from the AC line!

You’ll be able to regulate from 1. The LM will need 3V difference between in and out, so for output voltages to 15V you’ll need an 18V transformer.

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There are some problems with the design. The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost. Ground is connected to your mains! Semiiconductor we’ve got only 8. The circuit is wrong. There is a related line of 79xx devices which are complementary negative voltage regulators.



Reports of the death of the may be premature: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. This article needs additional citations for verification.

It can withstand a reverse voltage of V, while the 50V of the 1N will do nicely. The LM78S40 from Fairchild is not part of the 78xx family and does not use the same nattional.

Here you can calculate ripple as a function of input voltagecapacitance, and load. Using an LM in this manner is much better – it is designed to semiconductr used like this. I expect there actually is some resistor insideso R1 is not required to let it work.

In other projects Wikimedia Commons. Is this based design correct?