LM is an adjustable voltage regulator IC used for shunt regulator, current regulator, and temperature controller. The LM LMC is a voltage regulator designed primar- ily for series regulator applications By itself it will supply output currents up to mA but external. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are the property of their respective.

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Naturally, it datasheet frowned upon by a lot of designers that are just half as old. Minimum regulated output voltage is ca. Some extra bleeders are needed to make falling edge output regulations fast enough. A schematic where all this has been implemented can be see below: Provide enough voltage headroom.

Yes, it will oscillate if you forget or undercompensate. Email required Address never made public. You are commenting using your Twitter account. For your bread-and-butter PSU, they are still fine and noise is quite low. If you have a heavily overcompensated i. With less accurracy, you may go below that, but not by much. If you use current limiting, protect the base of the limiting transistor by a 1K, e.

The datasheet is not very instructive on this, but the floating regulator variants will fail to regulate when the load resistance becomes to high. There is even an obsolete 80V version, the LCB. The LM is not discontinued at all, sold by TI l7m23 the millions, available from all electronic datasheett and dirt cheap. From a power supply manufacturer I read some email correspondence with TI tech support where he also claimed more drift in recent parts. Error amp bias current.


If we pragmatically summarize the pros and cons of this methusalem, we end up with something like this:. LM is an adjustable voltage regulator IC used for shunt regulator, current regulator, and temperature controller.

Try with different output voltages, load currents and input voltages. To use this IC for the different range of required output voltage, you can proceed with various circuits available in LM datasheet with having your needed output range.

Minimum Output for Floating Regulators. Can serve as positive, negative, shunt, pass, floating or switching regulator or as a temperature controller.

Also able to use as either linear or switching type regulator. On a transistor level, you can see some design tricks by the legendary Bob Widlar: Before you specify a compensation cap, run a few tests using SPICE to see if gain and phase margins are in order. Fill in your details below or click an icon to log in: The LM is a classic, now available for 50 continuous years and still going strong. There are only better ones with low voltage 10V and lessand they cost a lot more than a LM A PNP pass transistor can further improve noise performance.

Minimum dropout voltage is ca. After some ping-pong TI recommended the MIL-spec part and guaranteed that this would be free from drift.

If you need to regulate lower voltages, the LM chip itself needs a separate power input at 10V minimum. But this IC is specially designed for series regulator application. Click here for a larger resolution picture …. We have only a factor of ca.

Take all networks into account, and make sure that the reference divider and the output sampling network present the same impedance to the error amplifier inputs.

A Collection of Proper Design Practices using the LM IC Regulator – Electronic Projects for Fun

It can be found here. Its a self-heated reference. Pin configuration Pin No. Moderate error amplifer gain. It can able to provide a higher range of output voltage and current up to 10A by simply adding a series pass transistor with it, with having a wider range of operating temperature so the IC able to withstand for long.


National Semiconductor

For getting an output voltage range from 2v to 7v you can use the circuit below, which is a Basic Voltage Regulator circuit using LM voltage regulator IC. A lot of basic application circuits can be found in the LM datasheet. Current limiting sensitive to overload. Tempco is also very good, also when compared to newer chips. The interior design of an LM looks like this: Both have been making s for decades, and after the sale TI took over the National Semiconductor designation of LM and used their own of uA The load must be able to drain at least the supply current of the circuit without exhibiting a voltage higher than the desired output voltage.

LM IC Pinout, Specifications, Equivalent & Datasheet

The LM values translate to about 0. You are commenting using your WordPress.

Notify me of new comments via email. When you ask for the same basic parameters 40V, mA, … there is simply datqsheet better IC today. Click here for a larger resolution picture … A lot of basic application circuits can be found in the LM datasheet. If you want precision current control, dont try to do this with a pot sampling a fraction of voltage across a shunt measurement resistor.

For finding the value of output voltage for this circuit you can use the formula below:.