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: Zulugal Guzilkree
Country: Mauritius
Language: English (Spanish)
Genre: Health and Food
Published (Last): 23 February 2007
Pages: 465
PDF File Size: 15.22 Mb
ePub File Size: 19.54 Mb
ISBN: 851-1-45424-242-7
Downloads: 72408
Price: Free* [*Free Regsitration Required]
Uploader: Mezirg

Minimum regulated output voltage is ca. A schematic where all this has been implemented can be see below: Its a self-heated reference. Input voltage goes up tp 40V constant, with 50V pulses allowed. Some extra ,m723 are needed to make falling edge output regulations fast enough. 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.

Before you specify a compensation cap, run a few tests using SPICE to see if gain and phase margins are in order. So, in case you have decided for an LM to make a good power supply, there are some rules of thumb that will make your life easier:.

People used to 3-terminal regulators are in for a culture shock caused by the amount of design aspects to consider. No wonder after 50 years, it is known what you may expect and what not. This cancels the error amps base bias currents. Minimum Output for Floating Regulators. You can tailor the frequency response to your application but you also have to do that because there is no internal compensation.

This terminal is directly supplied from the supply when not connected to series pass transistor. When you ask for the same basic parameters 40V, mA, … there vatasheet simply no better IC today.


Not a very high PSRR. Intolerant dataaheet missing or misdesigned compensation. Especially when driving MOSFETs, you might need a bleeder resistor to make the falling edges fast enough for your needs. With less accurracy, you may go below that, but not by much. Try with different output voltages, load currents and input voltages.

National Semiconductor – datasheet pdf

daatasheet 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. You are commenting using your Facebook account. 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. The curves of the limiting transistors Vbe voltages over temperature in the LM datasheet should make it absolutely clear that no precision can datasgeet expected here.

First, ST went out of the LM business. After some ping-pong TI recommended dtaasheet MIL-spec part and guaranteed that this would be free from drift. 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.

LM Datasheet(PDF) – National Semiconductor (TI)

No microscopic SMD cases available. Error amp bias current. The datasheet is not very instructive on this, but the floating regulator variants datashewt fail to regulate when the load resistance becomes to high. A lot of basic application circuits can be found in the LM datasheet.

A Collection of Proper Design Practices using the LM723 IC Regulator

If you need to regulate lower voltages, the LM chip itself needs a separate power input at 10V minimum. If we pragmatically summarize the pros and cons of this methusalem, we end up with something like this: For finding the value of output voltage for this circuit you can use the formula below:. Fill in your details below or click an icon to log in: Submitted by webmaster on 15 January The performance of an LM is not bad at all, especially for noise and long term stability.


Its comparing apples and oranges.

For your bread-and-butter PSU, they are still fine and noise is quite low. If you have a heavily overcompensated i. 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.

The net and some manufacturers application notes are also a good source of information. This also acts as a soft start feature.

National Semiconductor

If we pragmatically summarize the pros and cons of this methusalem, we end up with something like this:. Pin configuration Pin No. TL — Programmable Datssheet Voltage. 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. Gate parasitic suppression resistors of a few Ohms are also a good idea.

Click here for a larger resolution picture …. The collector voltage Vc driving the output does not need to be stabilized. Can serve as positive, negative, shunt, pass, floating or switching regulator or as a temperature controller. Click here for a larger resolution picture … A lot of basic application circuits can be found in the LM datasheet. This wastes some power, but speed, noise and other performance criteria xatasheet a lot better with a few volts across the pass transistor.