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.

Author: Shalmaran Zulkimuro
Country: Paraguay
Language: English (Spanish)
Genre: Literature
Published (Last): 8 July 2007
Pages: 148
PDF File Size: 14.87 Mb
ePub File Size: 14.49 Mb
ISBN: 310-4-22211-770-6
Downloads: 26917
Price: Free* [*Free Regsitration Required]
Uploader: Kajilkree

Al Kepp 1, 5 19 You’re right about the voltage drops, though I would calculate with 1V per diode. Ground is connected to your mains!

5 Pcs Original National Semiconductor LM340T5 7805 7805p

Then I am confused about voltages. Like Russell says, semiconductof can protect the output against overvoltage by placing a power diode between output and input, cathode to the input. Sign up or log in Sign up using Google. This page was last edited on 5 Decemberat The is the most common, as its regulated 5-volt supply provides a convenient power source for most TTL components. Notice that seniconductor circuit is not isolated from the AC line!

Is it normally legal and working, does it mean that we can have any output voltage from any legal input voltage using these IC regulators? Use an LM if possible – datasheet here. As you noted you can’t go all the way to 15V, though your calculation contains an error: Here you can calculate ripple as a function of input semicondductorcapacitance, and load. What I miss there is R1.


5 Pcs Original National Semiconductor LMT5 p | eBay

First some shocking news: Retrieved from ” https: There are some problems with the design. Also, LM has got a lower dropout voltage than and can give a higher current.

You’ll be able to regulate from 1.

This means your regulator won’t go higher than These devices semicojductor an input voltage anywhere from around 2. By using this site, you agree to the Terms of Use and Privacy Policy. After human innihilate the planet in a nuclear fireball, the only thing left will be cockroaches and regulators. Home Questions Tags Users Unanswered.

It can withstand a reverse voltage of V, while the 50V of the 1N will do nicely. Post as a guest Name. Articles semiconductot additional references from January All articles needing additional references.

This is the first I’ve seen of consolidation between TI and National part numbers, but you knew it had to come sooner or later.

I am asking because it doesn’t correspond to the the datasheet: Russell McMahon k 9 Sign up using Facebook. Isn’t LM generally more suitable for adjustable voltage supplies of this kind than ? The circuit is wrong. My second question goes here: You’ll also have to account for the ripple across the smoothing capacitor. From Wikipedia, the free encyclopedia. The 78xx line are positive voltage regulators: The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost.


The seems to me like a LM with those R1 antional R2 added inside. How can this give 15 Volt output?

To protect against the back polarity problem that you mentioned, connect a diode from output to input usually non conducting. In the datasheet for the LM the LM is recommended as a variable output alternative.

It is said to be a regulated l,7805 supply with variable DC output V, mA.

semiconduvtor Is this based design correct? Wow, when did LM become obsolete? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It is a component in switching regulator designs and is not a linear regulator like other 78xx devices. My life will never be the same again: Encyclopedia of Electronic Components Volume 1: Views Read Edit View history.

Reports of the death of the may be premature: There is no need to connect the mains side of the transformer to circuit ground. I expect there actually is some resistor insideso R1 is not required to let it work.

Fig 5 in the datasheet is the same effectively as above but the reference voltage is 1.

January Learn how and when to remove this template message. In other projects Wikimedia Commons.