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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I found this design on internet: Also, LM has got a lower dropout voltage than and can give a higher current.

SOT23*LM National Semiconductor => TI

In other projects Wikimedia Commons. Fig 5 in the datasheet is the same effectively as above but the reference voltage is 1. I am asking because it doesn’t correspond to the the datasheet:. The 1N for the rectifier is semiconductoe. Is this design around correct? Using an LM in this manner is much better – it is designed to be used like this.

And my third question: Ground is connected to your mains! From Wikipedia, the free encyclopedia. Then I am confused about voltages.


These devices support an input voltage anywhere from around 2. 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.

Home Questions Tags Users Unanswered. Wow, when did LM become obsolete? Good news natiomal China btw: Isn’t LM generally more suitable for adjustable voltage supplies of this kind than ? Use an LM if possible – datasheet here.

Semicknductor you noted you can’t go all the way to 15V, though your calculation contains an error: Retrieved from ” https: Email Required, but never shown. Mastering the Raspberry Pi. Sign up using Email and Password.


How can this give 15 Volt output? The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost.

In the datasheet for lmm7805 LM the LM is recommended as a variable output alternative.

Here you can calculate ripple as a function of input voltagecapacitance, and load. Encyclopedia of Electronic Components Volume 1: Is this based design correct? Sign up or log in Sign up using Google. The LM78S40 from Fairchild is not part of the 78xx family and does not use the same design. The transformer’s output on the above picture is 12V, then 2 diodes take 0.


This means your regulator won’t go higher than Like Russell says, you can protect semicondictor output against overvoltage by placing a power diode between output and input, cathode to the input. For the years, see 8th millennium. It is said to be a regulated power supply with variable DC output V, mA.

SOT23*LM National Semiconductor => TI

You’ll also have to account for the ripple across the smoothing capacitor. It can withstand a reverse voltage of V, while the 50V of the 1N will do nicely. 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. The is the most common, as its regulated 5-volt supply provides a convenient power source for most TTL components.

You’re right about the voltage drops, though I would calculate with 1V per diode.

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