データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

LM196 データシート(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM196
部品情報  LM196/LM396 10 Amp Adjustable Voltage Regulator
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM196 データシート(HTML) 5 Page - National Semiconductor (TI)

  LM196 Datasheet HTML 1Page - National Semiconductor (TI) LM196 Datasheet HTML 2Page - National Semiconductor (TI) LM196 Datasheet HTML 3Page - National Semiconductor (TI) LM196 Datasheet HTML 4Page - National Semiconductor (TI) LM196 Datasheet HTML 5Page - National Semiconductor (TI) LM196 Datasheet HTML 6Page - National Semiconductor (TI) LM196 Datasheet HTML 7Page - National Semiconductor (TI) LM196 Datasheet HTML 8Page - National Semiconductor (TI) LM196 Datasheet HTML 9Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 14 page
background image
Application Hints (Continued)
Although it may not be immediately obvious best load regu-
lation is obtained when the top of the divider is connected
directly to the output pin not to the load This is illustrated in
Figure 2 If R1 were connected to the load the effective
resistance between the regulator and the load would be
(Rw) c
R2aR1
R1
J
Rw e Line Resistance
Connected as shown Rw is not multiplied by the divider
ratio Rw is about 0004X per foot using 16 gauge wire This
translates to 40 mVft at 10A load current so it is important
to keep the positive lead between regulator and load as
short as possible
TLH9059 – 2
FIGURE 2 Proper Divider Connection
The input resistance of the sense pin is typically 6 kX mod-
eled as a resistor between the sense pin and the output pin
Load regulation will start to degrade if a resistance higher
than 10X is inserted in series with the sense This assumes
a worst-case condition of 05V between output and sense
pins Lower differential voltage will allow higher sense series
resistance
Thermal Load Regulation
Thermal as well as electrical load regulation must be con-
sidered with IC regulators Electrical load regulation occurs
in microseconds thermal regulation due to die thermal gra-
dients occurs in the 02 ms-20 ms time frame and regula-
tion due to overall temperature changes in the die occurs
over a 20 ms to 20 minute period depending on the time
constant of the heat sink used Gradient induced load regu-
lation is calculated from
D
VOUT e (VIN b VOUT) c (DIOUT) c (b)
b e
Thermal regulation specified on data sheet
For VIN e 9V VOUT e 5V DIOUT e 10A and b e
0005%W this yields a 02% change in output voltage
Changes in output voltage due to overall temperature rise
are calculated from
VOUT e (VINb VOUT) c (DIOUT) c (TC) c (ijA)
TC e Temperature coefficient of output voltage
ijA e Thermal resistance from junction to ambient ijA is
approximately 05 CW a i of heat sink
For the same conditions as before with TC e 0003% C
and ijA e 15 CW the change in output voltage will be
018% Because these two thermal terms can have either
polarity they may subtract from or add to electrical load
regulation For worst-case analysis they must be assumed
to add If the output of the regulator is trimmed under load
only that portion of the load that changes need be used in
the previous calculations significantly improving output ac-
curacy
Line Regulation
Electrical line regulation is very good on the LM196typi-
cally less than 0005% change in output voltage for a 1V
change in input This level of regulation is achieved only for
very low load currents however because of thermal ef-
fects Even with a thermal regulation of 0002%W and a
temperature coefficient of 0003% C DC line regulation
will be dominated by thermal effects as shown by the follow-
ing example
Assume VOUT e 5V VIN e 9V IOUT e 8A
Following a 10% change in input voltage (09) the output
will change quickly (s100 ms) due to electrical effects by
(0005%V) c (09V) e 00045% In the next 20 ms the
output will change an additional (0002%W) c (8A) c
(09V) e 00144% due to thermal gradients across the die
After a much longer time determined by the time constant
of the heat sink the output will change an additional
(0003% C) c (8A) c (09V) c (2 CW) e 0043% due to
the temperature coefficient of output voltage and the ther-
mal resistance from die to ambient (2 CW was chosen for
this calculation) The sign of these last two terms varies
from part to part so no assumptions can be made about any
cancelling effects All three terms must be added for a prop-
er analysis This yields 00045 a 00144 a 0043 e
0062% using
typical values for thermal regulation and tem-
perature coefficient For worst-case analysis the maximum
data sheet specifications for thermal regulation and temper-
ature coefficient should be used along with the
actual ther-
mal resistance of the heat sink being used
Paralleling Regulators
Direct paralleling of regulators is not normally recommend-
ed because they do not share currents equally The regula-
tor with the highest reference voltage will supply all the cur-
rent to the load until it current limits With an 18A load for
instance one regulator might be operating in current limit at
16A while the second device is only carrying 2A Power dis-
sipation in the high current regulator is extremely high with
attendant high junction temperatures Long term reliability
cannot be guaranteed under these conditions
Quasi-paralleling may be accomplished if load regulation is
not critical The connection shown in
Figure 5a will typically
share to within 1A with a worst-case of about 3A Load
regulation is degraded by 150 mV at 20A loads An external
op amp may be used as in
Figure 5b to improve load regula-
tion and provide remote sensing
5


同様の部品番号 - LM196

メーカー部品番号データシート部品情報
logo
National Semiconductor ...
LM1964 NSC-LM1964 Datasheet
232Kb / 4P
   SENSOR INTERFACE AMPLIFIER
LM1964V NSC-LM1964V Datasheet
232Kb / 4P
   SENSOR INTERFACE AMPLIFIER
More results

同様の説明 - LM196

メーカー部品番号データシート部品情報
logo
Seme LAB
IP138A SEME-LAB-IP138A Datasheet
56Kb / 6P
   5 AMP POSITIVE ADJUSTABLE VOLTAGE REGULATOR
IP137A SEME-LAB-IP137A_03 Datasheet
48Kb / 4P
   1.5 AMP NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
logo
Semtech Corporation
LAS79HG SEMTECH-LAS79HG Datasheet
262Kb / 5P
   5 AMP NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
logo
Seme LAB
IP137MAHVH SEME-LAB-IP137MAHVH Datasheet
17Kb / 2P
   0.5 AMP NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
logo
Fairchild Semiconductor
UA78HGA FAIRCHILD-UA78HGA Datasheet
305Kb / 4P
   Positive Adjustable 5-Amp Voltage Regulator
logo
Micropac Industries
52150 MICROPAC-52150 Datasheet
114Kb / 4P
   POSITIVE ADJUSTABLE 5-AMP VOLTAGE REGULATOR
52149 MICROPAC-52149 Datasheet
112Kb / 3P
   NEGATIVE ADJUSTABLE 5-AMP VOLTAGE REGULATOR
logo
Seme LAB
IP117MAHVH SEME-LAB-IP117MAHVH Datasheet
24Kb / 2P
   0.5 AMP POSITIVE ADJUSTABLE VOLTAGE REGULATOR
IP137A SEME-LAB-IP137A Datasheet
43Kb / 4P
   1.5 AMP NEGATIVE ADJUSTABLE VOLTAGE REGULATOR
IP150A SEME-LAB-IP150A Datasheet
59Kb / 6P
   3 AMP POSITIVE ADJUSTABLE VOLTAGE REGULATOR
More results


Html Pages

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


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
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