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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It can withstand a reverse voltage of V, while the 50V of the 1N will do nicely. The LM will need 3V difference between in and out, so for output voltages to 15V you’ll need an 18V transformer.

These devices support an input voltage anywhere from around 2. Use an LM if possible – datasheet here. Email Required, but never shown.

To protect against the back polarity problem that you mentioned, connect a diode from output to input usually non conducting. 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.

SOT23*LM National Semiconductor => TI

Good news for China btw: A can be used in an 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.


Like Russell says, you can protect the output against overvoltage by placing a power diode between output and input, cathode to the input. The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low cost. Xemiconductor of Electronic Components Volume 1: Reports of the death of the may be premature: You’ll also have to account for the ripple across the smoothing capacitor.

There are some problems with the design.

power supply – Is this based design correct? – Electrical Engineering Stack Exchange

Is this based design correct? Mastering the Raspberry Pi.

I think you answered part of your own question: It is a component in switching regulator designs and is not a linear regulator like other 78xx devices. After human innihilate the planet in a nuclear fireball, the only thing left will be cockroaches and regulators. Also, LM has got a lower dropout voltage than and can give a higher current.


Post as a guest Name. Then I am confused about voltages. Articles needing additional references from January All articles needing additional references. The seems to me like a LM with those R1 and R2 added inside. The LM78S40 from Fairchild is not part of the 78xx family and does not use the same design.


Using an LM in this manner is much better – it is designed to be used like this. Unsourced material may be challenged and removed. 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. The SR from Datel is a full switching power supply module designed as a drop-in replacement for 78xx chipsand not a linear regulator like the 78xx ICs.

How can this give 15 Volt output? Here you can calculate ripple as a function of input voltagecapacitance, and load.

Al Kepp 1, 5 19 My life will never be the same again: Russell McMahon k 9 Ground is connected to your mains! The is the most common, as its regulated 5-volt supply provides a convenient power source for most TTL components.

Industrial Electronics and Control. Possibly lethal, but you may survive it The variable resistor to regulate the output voltage.


The 1N for the rectifier is overkill. Please help improve this article by adding citations to reliable sources.

So we’ve got only 8. From Wikipedia, the free encyclopedia. Is this design around correct?