Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

LM3815M-1.0 Folha de dados(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM3815M-1.0
Descrição Electrónicos  Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3815M-1.0 Folha de dados(HTML) 10 Page - National Semiconductor (TI)

Back Button LM3815M-1.0 Datasheet HTML 6Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 7Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 8Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 9Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 10Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 11Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 12Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 13Page - National Semiconductor (TI) LM3815M-1.0 Datasheet HTML 14Page - National Semiconductor (TI)  
Zoom Inzoom in Zoom Outzoom out
 10 / 14 page
background image
Product Operation
The current is sampled by the delta-sigma modulator, as il-
lustrated in
Figure 6. The pulse density output of the
delta-sigma modulator is digitally filtered. The digital output
is then compared to the output of a digital ramp generator.
This produces a PWM output. The duty cycle of the PWM
output is proportional to the amount of current flowing. A duty
cycle of 50% indicates zero current flow. If the current is flow-
ing in positive direction, the duty cycle will be greater than
50%. Conversely, the duty cycle will be less than 50% for
currents flowing in the negative direction. A duty cycle of
95.5% (4.5%) indicates the current is at I
MAX (−IMAX). The IC
can sense currents from −I
MAX to +IMAX. Options for IMAX are
1A or 10A. The sense current is given by:
I
SENSE = 2.2 (D−0.5)(IMAX)
where D is the duty cycle of the PWM waveform, and I
MAX is
the full scale current (1A or 10A). Similarly, the duty cycle is
given by:
D = [I
SENSE/(2.2 IMAX)] + 0.5
For quick reference, see the Conversion Tables in
Table 1
and
Table 2.
The user should note that, while the LM3814-7.0/
LM3815-7.0 will read 10A full scale, it is rated for 10A op-
eration for a duration of no more than 200 msec, and 7A
operation continuously.
In this IC, the current is averaged over 6 msec time slots.
Hence, momentary current surges of less than 6 msec are
tolerated.
This is a sampled data system which requires an
anti-aliasing filter, provided by the filter capacitor.
The delta-sigma modulator converts the sensed current to
the digital domain. This allows digital filtering, and provides
immunity to current and noise spikes. This type of filtering
would be difficult or impossible to accomplish on an IC with
analog components.
When ordering, the user has to specify whether the part is
being used for low-side or high-side sense. The user also
needs to specify the full scale value. See the Ordering Infor-
mation table for details.
DS101013-10
FIGURE 6. Functional block diagram of LM3814 and LM3815
www.national.com
10


Nº de peça semelhante - LM3815M-1.0

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
National Semiconductor ...
LM3815M-1.0 NSC-LM3815M-1.0 Datasheet
708Kb / 14P
   Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
More results

Descrição semelhante - LM3815M-1.0

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
National Semiconductor ...
LM3814 NSC-LM3814_05 Datasheet
708Kb / 14P
   Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3812 NSC-LM3812 Datasheet
258Kb / 14P
   Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3824 NSC-LM3824 Datasheet
265Kb / 12P
   Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
LM3822 NSC-LM3822 Datasheet
265Kb / 12P
   Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
logo
Maxim Integrated Produc...
MAX40016 MAXIM-MAX40016 Datasheet
940Kb / 22P
   4-Decade Current Sense Amplifier with Integrated Current Sense Element
2018
logo
Ohmite Mfg. Co.
MCS OHMITE-MCS Datasheet
491Kb / 2P
   Metal Element Current Sense
logo
Maxim Integrated Produc...
MAX40016EVKIT MAXIM-MAX40016EVKIT Datasheet
995Kb / 9P
   Integrated Current Sense Element
Rev 0; 10/17
logo
Semtech Corporation
SC1403 SEMTECH-SC1403_04 Datasheet
560Kb / 31P
   Mobile Multi-Output PWM Controller with Lossless Current Sense
SC1404 SEMTECH-SC1404 Datasheet
501Kb / 27P
   Mobile Multi-Output PWM Controller with Virtual Current Sense
logo
Richtek Technology Corp...
RT9554A RICHTEK-RT9554A Datasheet
120Kb / 10P
   Battery Output Current Sense Protection IC
More results


Html Pages

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


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
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