Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

LM140K-5.0 Datenblatt(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM140K-5.0
Bauteilbeschribung  3-Terminal Positive Regulators
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM140K-5.0 Datenblatt(HTML) 11 Page - National Semiconductor (TI)

Back Button LM140K-5.0 Datasheet HTML 7Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 8Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 9Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 10Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 11Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 12Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 13Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 14Page - National Semiconductor (TI) LM140K-5.0 Datasheet HTML 15Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 17 page
background image
Application Hints
The LM340/LM78XX series is designed with thermal protec-
tion, output short-circuit protection and output transistor safe
area protection. However, as with any IC regulator, it be-
comes necessary to take precautions to assure that the
regulator is not inadvertently damaged. The following de-
scribes possible misapplications and methods to prevent
damage to the regulator.
SHORTING THE REGULATOR INPUT
When using large capacitors at the output of these regula-
tors, a protection diode connected input to output (Figure 1)
may be required if the input is shorted to ground. Without the
protection diode, an input short will cause the input to rapidly
approach ground potential, while the output remains near
the initial V
OUTbecause of the stored charge in the large
output capacitor. The capacitor will then discharge through a
large internal input to output diode and parasitic transistors.
If the energy released by the capacitor is large enough, this
diode, low current metal and the regulator will be destroyed.
The fast diode in Figure 1 will shunt most of the capacitors
discharge current around the regulator. Generally no protec-
tion diode is required for values of output capacitance
≤ 10
µF.
RAISING THE OUTPUT VOLTAGE ABOVE THE INPUT
VOLTAGE
Since the output of the device does not sink current, forcing
the output high can cause damage to internal low current
paths in a manner similar to that just described in the “Short-
ing the Regulator Input” section.
REGULATOR FLOATING GROUND (Figure 2)
When the ground pin alone becomes disconnected, the
output approaches the unregulated input, causing possible
damage to other circuits connected to V
OUT. If ground is
reconnected with power “ON”, damage may also occur to the
regulator. This fault is most likely to occur when plugging in
regulators or modules with on card regulators into powered
up sockets. Power should be turned off first, thermal limit
ceases operating, or ground should be connected first if
power must be left on.
TRANSIENT VOLTAGES
If transients exceed the maximum rated input voltage of the
device, or reach more than 0.8V below ground and have
sufficient energy, they will damage the regulator. The solu-
tion is to use a large input capacitor, a series input break-
down diode, a choke, a transient suppressor or a combina-
tion of these.
When a value for
θ
(H–A) is found using the equation shown,
a heatsink must be selected that has a value that is less than
or equal to this number.
θ
(H–A) is specified numerically by the heatsink manufacturer
in this catalog, or shown in a curve that plots temperature
rise vs power dissipation for the heatsink.
00778108
FIGURE 1. Input Short
00778109
FIGURE 2. Regulator Floating Ground
00778110
FIGURE 3. Transients
www.national.com
11


Ähnliche Teilenummer - LM140K-5.0

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Texas Instruments
LM140K-5.0 TI1-LM140K-5.0 Datasheet
963Kb / 19P
[Old version datasheet]   LM340/LM78XX Series 3-Terminal Positive Regulators
LM140K-5.0 TI1-LM140K-5.0 Datasheet
1Mb / 14P
[Old version datasheet]   3-Terminal Positive Regulator
LM140K-5.0/883 TI1-LM140K-5.0/883 Datasheet
221Kb / 14P
[Old version datasheet]   LM140QML Three Terminal Positive Regulators
LM140K-5.0/NOPB TI1-LM140K-5.0/NOPB Datasheet
1Mb / 14P
[Old version datasheet]   3-Terminal Positive Regulator
More results

Ähnliche Beschreibung - LM140K-5.0

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
National Semiconductor ...
LM140L NSC-LM140L Datasheet
143Kb / 6P
   3-Terminal Positive Regulators
logo
Minilogic Device Corpor...
78LXXPRG MINILOGIC-78LXXPRG Datasheet
202Kb / 7P
   3-Terminal Positive Regulators
logo
National Semiconductor ...
LM78L05 NSC-LM78L05 Datasheet
211Kb / 12P
   3-Terminal Positive Regulators
LM78LXX NSC-LM78LXX Datasheet
685Kb / 14P
   3-Terminal Positive Regulators
logo
Minilogic Device Corpor...
78LXXPRG MINILOGIC-78LXXPRG_10 Datasheet
200Kb / 6P
   3-Terminal Positive Regulators
logo
National Semiconductor ...
LM342 NSC-LM342 Datasheet
138Kb / 6P
   3-Terminal Positive Regulators
logo
Sipex Corporation
SP7805V-L SIPEX-SP7805V-L Datasheet
391Kb / 10P
   3-Terminal Positive Regulators
SP78XX SIPEX-SP78XX Datasheet
368Kb / 10P
   3-Terminal Positive Regulators
logo
Texas Instruments
LM341-12 TI1-LM341-12 Datasheet
729Kb / 13P
[Old version datasheet]   3-Terminal Positive Voltage Regulators
logo
GTM CORPORATION
G3U78XXA GTM-G3U78XXA Datasheet
206Kb / 6P
   3-TERMINAL POSITIVE VOLTAGE REGULATORS
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com