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LM350A Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce LM350A
Description  LM150/LM350A/LM350 3-Amp Adjustable Regulators
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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LM350A Fiches technique(HTML) 7 Page - Texas Instruments

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LM150, LM350-N, LM350A
www.ti.com
SNVS772B – MAY 1998 – REVISED MARCH 2013
Figure 16. Regulator with Line Resistance
in Output Lead
With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two
separate leads to the case. The ground of R2 can be returned near the ground of the load to provide remote
ground sensing and improve load regulation.
PROTECTION DIODES
When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to
prevent the capacitors from discharging through low current points into the regulator. Most 10
μF capacitors have
low enough internal series resistance to deliver 20A spikes when shorted. Although the surge is short, there is
enough energy to damage parts of the IC.
When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge
into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage
of the regulator, and the rate of decrease of VIN. In the LM150, this discharge path is through a large junction that
is able to sustain 25A surge with no problem. This is not true of other types of positive regulators. For output
capacitors of 25
μF or less, there is no need to use diodes.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs
when either the input or output is shorted. Internal to the LM150 is a 50
Ω resistor which limits the peak discharge
current. No protection is needed for output voltages of 25V or less and 10
μF capacitance. Figure 17 shows an
LM150 with protection diodes included for use with outputs greater than 25V and high values of output
capacitance.
D1 protects against C1
D2 protects against C2
Figure 17. Regulator with Protection Diodes
(2)
Copyright © 1998–2013, Texas Instruments Incorporated
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Product Folder Links: LM150 LM350-N LM350A


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