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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Datasneet 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.

This also acts as a soft dataaheet feature. Compensation by the user. Silence or no reply. A lot of basic application circuits can be found in the LM datasheet. This wastes some power, but speed, noise and other performance criteria are a lot better with a few volts across the pass transistor. If we pragmatically summarize the pros and cons of this methusalem, we end up with something like this:. This cancels the error amps base bias currents. Yes, it will oscillate if you forget or undercompensate.

Fill in your details below or click an icon to log in: A schematic where all this has been implemented can be see below: Some extra bleeders are needed to make falling edge output regulations fast enough. Input voltage goes up tp 40V constant, with 50V pulses allowed. Click here for a larger resolution picture … A lot of basic application circuits can be found in the LM datasheet.

We have only a factor of ca. If you use current limiting, protect the base of the limiting datsheet by a 1K, e. With less accurracy, you may go below that, but not by much. It can be found here. Before you specify a compensation cap, run a few tests using SPICE to see if gain and phase margins are in order.


Submitted by webmaster on 15 January Provide enough voltage headroom. Tempco is also very good, also when compared to newer chips. Click here for a larger resolution picture …. The curves of the limiting transistors Vbe voltages over temperature in the LM datasheet should make it absolutely clear that no precision can be pm723 here.

A Collection of Proper Design Practices using the LM723 IC Regulator

They dont make this part anymore. 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. Minimum regulated output voltage is ca.

One of the best low noise regulators even today when hooked up properly. You can tailor the frequency response to your application but you also have to do that because there is no internal compensation. Minimum dropout voltage is ca. 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.

As I found out and others did as well their consumer parts where a bit drifty within spec limitsprobably by a conversion to a new manufacturing process with not just improvements as a consequence. Although the LM can dissipate a few mW and deliver up to mA, better use an external pass transistor to do the hard work and keep the regulator chip cool.


If you have a heavily overcompensated i. If you want precision current control, dont try to do this with a pot sampling a fraction of voltage across a shunt measurement resistor. 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. The net and some manufacturers application notes are also a good source of information.

Its comparing apples and oranges. Its datashert self-heated reference. You are commenting using your Facebook account.

LM Datasheet(PDF) – National Semiconductor (TI)

Minimum Output for Floating Regulators. If you need to regulate lower voltages, the LM chip itself needs a separate power input at 10V minimum. Also able to use as either linear or switching type regulator. For your bread-and-butter PSU, they are still fine and noise is quite low.

Error amp bias om723. Email required Address never made public. You are commenting using your Twitter account. The way to go is either high side sensing with an op datasbeet that can do that, or a floating design like the famous Elektor one from 1 x LM, 2 x LM The interior design of an LM looks like this: Gate parasitic suppression resistors of a few Ohms are also a good idea. 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.

I added a reference study that compares voltage regulator noise.