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.

Author: Tacage Zolorn
Country: Bangladesh
Language: English (Spanish)
Genre: Education
Published (Last): 13 January 2010
Pages: 265
PDF File Size: 14.77 Mb
ePub File Size: 13.96 Mb
ISBN: 452-7-55429-533-1
Downloads: 7138
Price: Free* [*Free Regsitration Required]
Uploader: Niran

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

People used to 3-terminal regulators are in for a culture shock caused by the amount of design ddatasheet to consider. 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.

The superbeta bipolars in the error amp have a low, but nonzero bias current that can cause voltage shifts of a few millivolts across voltage divider or RC filter resistors. First, ST went out of the LM business.

The current limiting feature is implemented as a transistor that is turned on by the voltage drop on a current sensing resistor. No microscopic SMD cases available. Minimum Output for Floating Regulators. Pin configuration Pin No.

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. I added a reference study that compares voltage regulator noise.

  ISO 22900-1 PDF

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.

Silence or no reply. Submitted by datashheet on 15 January The way to go is either high side sensing with an op amp that can do that, or a floating design like the famous Elektor one from 1 x LM, 2 x LM You are commenting using your Facebook account. Leave a Reply Cancel reply Enter your comment here Minimum regulated output voltage is ca.

National Semiconductor

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.

Its a self-heated reference. For your bread-and-butter PSU, they are still fine and noise is quite low. Click here for a larger resolution picture … A lot of basic application circuits can be found in the LM datasheet. Naturally, it is frowned upon by a lot of designers that are just half as old. From a power supply manufacturer I read some email correspondence with TI tech support where he also claimed more drift in recent parts.

Some extra bleeders are needed to make falling edge output regulations fast enough. Yes, it will oscillate if you forget or undercompensate.

We have only a factor of ca. Support for external pass transistorskeeping on-chip dissipation and therefore drift low.

With less accurracy, you may go below that, but not by much. A lk723 with all suggestions implemented can be seen at the bottom of this page. If you use current limiting, protect the base of the limiting transistor by a 1K, e.


Extended Temperature Range available. Also able to use as either linear or switching type regulator. Notify me of new comments via email.

When you ask for the same basic parameters 40V, mA, … there is simply no better IC today. If you need to regulate lower voltages, the LM chip itself needs a separate power input at 10V minimum.

The curves of the limiting transistors Vbe voltages over temperature in the LM datasheet should make it absolutely clear that no precision can be expected here. There is even an obsolete 80V version, the LCB. The LM is not discontinued at all, sold by TI in the millions, available from all electronic distributors and dirt cheap.

A Collection of Proper Design Practices using the LM723 IC Regulator

This also acts as a soft start feature. The collector voltage Vc driving the output does not need to be stabilized. The interior design of an LM looks like this: Relying on a buried Zener low noise reference, it can compete with a lot of newer chips when it comes to stability it does have a long term stability rating in the datasheet, few new chips have that. Current limiting sensitive to overload.