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SPX116 Datasheet(PDF) 5 Page - Sipex Corporation

No. de Pieza. SPX116
Descripción  Low Dropout Voltage Three Terminal Regulator
Descarga  11 Pages
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Fabricante  SIPEX [Sipex Corporation]
Página de inicio  http://www.sipex.com
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SPX116 Datasheet(HTML) 5 Page - Sipex Corporation

 
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SPX116
Rev. 8/21/01
SPX116 Low Dropout Voltage Three Terminal Regulator
©Copyright 2001 Sipex Corporation
4
APPLICATION INFORMATION
The SPX116 requires an output capacitor for device stability.
The value required varies greatly depending upon the
application circuit and other factors. The high frequency
characteristics of electrolytic capacitors depend greatly on the
type and also on the manufacturer. Sometimes only bench
testing is the only means to determine the proper capacitor
type and value. Stability can be obtained with a tantalum or
ceramic capacitor value of 4.7
µF or greater.
Another critical point of electrolytic characteristics is its
performance over temperature. The SPX116 is designed to
operate starting at -40
°C which may not be true in the case of
electrolytic. Higher temperatures generally no problem. The
electrolytic. type in aluminum will freeze around -30
°C. This
could cause an oscillation at output of regulator. At a lower
temperature requirement by many applications the capacitor
should maintain its performance. So as a result, for an
application which regulator junction temperature does not
exceed 25
°C, the output capacitor can be reduced by the
factor of two over the value needed for the entire
temperature range.
In most applications the SPX116 is operating at few
milliamps. In these applications the output capacitance can
be further reduced. For example, when the regulator is
running at 10mA output current the output capacitance
value is half compared to the same regulator that is running
at 100mA. The value decreases with higher output voltages,
since the internal loop gain is reduced.
The worst case occurs at the lower temperature and
maximum operating currents, the entire circuit and the
electrolytic, should be cooled down to the minimum
temperature. The minimum of 0.6 volts required at the input
of regulator above the output to keep the power dissipation
and die heating to its minimum. After the value for the
capacitor has been determined for actual use, the value
should be doubled.


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