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LM1086R Datenblatt(PDF) 6 Page - HTC Korea TAEJIN Technology Co.

Teilenummer LM1086R
Bauteilbeschribung  1.5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
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Hersteller  HTC [HTC Korea TAEJIN Technology Co.]
Direct Link  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

LM1086R Datenblatt(HTML) 6 Page - HTC Korea TAEJIN Technology Co.

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1.5A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed)
LM1086
APPLICATION INFORMATION
The LM1086 series of adjustable and fixed regulators are easy to use and have all the protection
features expected in high performance voltage regulators : short circuit protection and thermal
shut-down. Pin compatible with older three terminal adjustable regulators, these devices offer the
advantage of a lower dropout voltage, more precies reference tolerance and improved reference
stability with temperature.
STABILITY
The circuit design used in the LM1086 series requires the use of an output capacitor as part of
the device frequency compensation.
The addition of 150uF aluminum electrolytic or a 22uF solid tantalum on the output will ensure
stability for all operating conditions. When the adjustment terminal is bypassed with a capacitor to
improve the ripple rejection, the requirement for an output capacitor increases. The value of 22uF
tantalum or 150uF aluminum covers all cases of bypassing the adjustment terminal. Without
bypassing the adjustment terminal smaller capacitors can be used with equally good results.
To ensure good transient response with heavy load current changes capacitor values on the
order of 100uF are used in the output of many regulators. To further improve stability and transient
response of these devices larger values of output capacitor can be used.
PROTECTION DIODES
Unlike older regulators, the LM1086 family does not need any
protection diodies between the adjustment pin and the output
and from the output tu the input to prevent over-stressing the die.
Internal resistors are limiting the internal current paths on the
LM1086 adjustment pin, therfore even with capacitors on the
adjustment pin no protection diode is needed to ensure device
safety under short-circuit conditions.
Diodes between the input and output are not usually needed.
Microsecond surge currents of 50A to 100A can be handled by the internal diode between the
input and output pins of the device. In norminal operations it is difficult to get those values of
surge currents even with the use of large output capacitances. If high value output capacitors are
used, such as 1000uF to 5000uF and the input pin is instantaneously shorted to ground, damage
can occur. Adiode from output to input is recommended, when a crowbar circuit at the input of the
LM1086 is used. Normal power supply cycling or even plugging and unplugging in the system will
not generate current large enough to do any damage.
The adjustment pin can be driven on a transient basis ±25V, with respect to the output without
any device degradation. As with any IC regulator, none the protection circuitry will be functional and
the internal transistors will break diwn if the maximum inout to output voltage differential is exceeded
HTC
- 6 -
LM1086


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