executable code (“object code”)), data sheets, BOMs, schematics, application notes, design & development tools, evaluation board material (i.e. BOM, Gerber, . LM LM – 3-Terminal Negative Regulator, Package: to , Pin Nb=3. The LM79XX series of 3-terminal regulators is available with fixed output. LM datasheet, LM pdf, LM data sheet, datasheet, data sheet, pdf, Contek Microelectronics, 3-terminal 1A negative voltage regulator. Output.

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We just need two capacitors of vale 2.

LM Datasheet(PDF) – National Semiconductor (TI)

Message 2 of 5. Message 3 of 5.

In our case the IC is an negative 5V regulator, meaning it provides -5V as output. These capacitors should be placed close to the terminals for them to work effectively.

Message 5 of 5. Complete Technical Details can be found at the LM voltage regulator datasheet given at the end of this page. In many cases where an Op-Amp is working in dual mode power supply a negative voltage will be regulated by these 79XX ICs. The output regulation is specified for a current change from 5 mA to 1 A. They provide a constant output voltage for a varied input voltage.


I swapped the LM for another -5V regulator, the UPC, which gave the correct output but failed after a few seconds.

Brief Description on Voltage Regulator Voltage regulators are very common in electronic circuits. Perhaps changes to other options in the “Custom Analysis Options” dialog will improve the convergence.

My mistake must be simple, but I can’t spot it.

Submitted by admin on 10 June The input capacitor 2. Thanks Lynn I tried that with a 1k load and that resulted in an output voltage of So our will provide a -5V output voltage. Screen capture llm7905 attached. If anyone has suggestions I would be most gratefull.

So I adtasheet back to the LM but that still resulted in the incorrect output. So Multisim cannot simulate the output of a garden variety, ultra common, component like the LM The maximum value is mV.

Negative voltage regulators are mainly used in Op-Amp and other circuits where a negative supply voltage is needed. Most Active Software Boards: This 7 Watts will be dissipated as heat. Although the datasheet does not specify or call for any minimum load, it also does not specify the performance at no load.


The convergence assistant suggest pm7905 switch the integration to the Gear algorithm, which resulted in a stable and correct output. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

The output current of this IC can go up to 1. TL — Datawheet Reference Voltage. Depending on the construction of the model for the regulator, it is possible that it needs a minimum load. Why do we need Negative Voltage Regulators?

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Also they should be of ceramic type, since ceramic capacitors are faster than electrolytic. Multisim Voltage reg simulation. This is a typical application circuit of the IC. Voltage regulators are very common in electronic circuits. Try putting a load resistor from each output to ground. Message 4 of 5. Message 1 of 5.