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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But this IC is specially designed for series regulator application. Minimum dropout voltage is ca.

If you use current limiting, protect the base of the limiting transistor by a 1K, e. You are commenting using your Facebook account. You can tailor the frequency response to your application but you also have to do that because there is no internal compensation. Extended Temperature Range available. One of the best low noise regulators even today when hooked up properly.

Tempco is also very good, also when compared to newer chips. For getting an output voltage range from 2v to 7v you can use the circuit dataxheet, which is a Basic Voltage Regulator circuit using LM voltage regulator IC. 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 LM IC Regulator – Electronic Projects for Fun

Not a very high PSRR. Provide enough voltage headroom. 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 Try with different output voltages, load currents and input voltages.


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. Yes, it will oscillate if you forget or undercompensate.

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. Click here for a larger resolution picture …. Especially when driving MOSFETs, you might need a bleeder resistor to make the falling edges fast enough for your needs.

National Semiconductor

I added a reference study that compares voltage regulator noise. Input voltage goes up tp 40V constant, with 50V pulses allowed.

Gate parasitic suppression resistors of a few Ohms are also a good idea. This cancels the error amps base bias currents. Click here for a larger resolution picture … A lot of basic application circuits can be found in the LM datasheet. A schematic with all suggestions implemented can be seen at the bottom of this page. If we pragmatically summarize the pros and cons of this methusalem, we end up with something like this: Silence or no reply.

LM IC Pinout, Specifications, Equivalent & Datasheet

Reason one is the low noise buried Zener reference, reason two is the fact that the reference voltage can be noise filtered before going into the error amp. 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. First, ST went out of the LM business. The performance of an LM is not bad at all, especially for noise and long term stability. The net and some manufacturers application notes are also a good source of information.


Notify me of new comments via email. Naturally, it is frowned upon by a lot of designers that are just half as old. For your bread-and-butter PSU, they are still fine and noise is quite low.

A Collection of Proper Design Practices using the LM723 IC Regulator

LM is an adjustable voltage regulator IC used for shunt regulator, current regulator, and temperature controller. This is due to the 7.

On a transistor level, you can see some design tricks by the legendary Bob Widlar: No wonder after 50 years, it is known what you may expect and what not. 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 datasyeet RC filter resistors.

They dont make this part anymore. Moderate error amplifer gain. For finding the value of output voltage for this circuit you can use the formula below:. If you want precision current control, dont try to do this with a pot sampling a fraction of voltage across a shunt measurement resistor. Its comparing datashee and oranges.

If you have a heavily overcompensated i. Current limiting sensitive to overload.