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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First some shocking news: Post as a guest Name. It can withstand a reverse voltage of V, while the 50V of the 1N will do nicely.

The 78xx line are positive voltage regulators: 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.

It is a component in switching regulator designs and is not a linear regulator like other 78xx devices. To protect against the back polarity problem that you mentioned, connect a diode from output to input usually non conducting. My life will never be the same again: From Wikipedia, the free encyclopedia. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.


Wikimedia Commons has media related to 78xx Series and Voltage regulator circuits. Is this design around correct?

Here you can calculate ripple as a function of input voltagecapacitance, and load. I am asking because it doesn’t correspond to the the datasheet: The LM78S40 from Fairchild is not part of the 78xx family and does not use the same design.

Isn’t LM generally more suitable for adjustable voltage supplies of this kind than ? natiomal

5 Pcs Original National Semiconductor LM340T5 7805 7805p

The is the most common, as its regulated 5-volt supply provides a convenient power source for most TTL components. Retrieved from ” https: Russell McMahon k 9 natiomal Possibly lethal, but you may survive it The variable resistor to regulate the output voltage. There are some problems with the design.

In other projects Wikimedia Commons. There is no need to connect the mains side of the transformer to circuit ground. The transformer’s output on the above picture is 12V, then 2 diodes take 0. The LM will need 3V difference between in and out, so for output voltages to 15V you’ll need an 18V transformer.


Ground is connected to your mains! Notice that this circuit is not isolated from the AC semcionductor So we’ve got only 8. I am asking because it doesn’t correspond to the the datasheet:. Fig 5 in the datasheet is the same effectively as above but the reference voltage is 1. It is said to be a regulated power supply with variable DC output V, mA.

SOT23*LM National Semiconductor => TI

You’ll be able to regulate from 1. Is this based design correct? What I miss there is Semiconductpr. Some devices provide slightly different voltages than usual, such as the LM78L62 6. 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. That’s right, the standard linear regulator since many moons.