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

X  

LM317MBDTRK Folha de dados(PDF) 8 Page - ON Semiconductor

Nome de Peças LM317MBDTRK
Descrição Electrónicos  500 mA Adjustable Output, Positive Voltage Regulator
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM317MBDTRK Folha de dados(HTML) 8 Page - ON Semiconductor

Back Button LM317MBDTRK Datasheet HTML 4Page - ON Semiconductor LM317MBDTRK Datasheet HTML 5Page - ON Semiconductor LM317MBDTRK Datasheet HTML 6Page - ON Semiconductor LM317MBDTRK Datasheet HTML 7Page - ON Semiconductor LM317MBDTRK Datasheet HTML 8Page - ON Semiconductor LM317MBDTRK Datasheet HTML 9Page - ON Semiconductor LM317MBDTRK Datasheet HTML 10Page - ON Semiconductor LM317MBDTRK Datasheet HTML 11Page - ON Semiconductor LM317MBDTRK Datasheet HTML 12Page - ON Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 14 page
background image
LM317M, NCV317MAB, NCV317MB
http://onsemi.com
8
APPLICATIONS INFORMATION
Basic Circuit Operation
The LM317M is a three−terminal floating regulator. In
operation, the LM317M develops and maintains a nominal
1.25 V reference (Vref) between its output and adjustment
terminals. This reference voltage is converted to a
programming current (IPROG) by R1 (see Figure 19), and this
constant current flows through R2 to ground. The regulated
output voltage is given by:
Vout + Vref 1 )
R2
R1
) IAdj R2
Since the current from the terminal (IAdj) represents an
error term in the equation, the LM317M was designed to
control IAdj to less than 100 mA and keep it constant. To do
this, all quiescent operating current is returned to the output
terminal. This imposes the requirement for a minimum load
current. If the load current is less than this minimum, the
output voltage will rise.
Since the LM317M is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
+
Vref
Adjust
Vin
Vout
LM317M
R1
IPROG
Vout
R2
IAdj
Vref = 1.25 V Typical
Figure 19. Basic Circuit Configuration
Load Regulation
The LM317M is capable of providing extremely good
load regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
programming resistor (R1) should be connected as close to
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
degrading regulation. The ground end of R2 can be returned
near the load ground to provide remote ground sensing and
improve load regulation.
External Capacitors
A 0.1
mF disc or 1.0 mF tantalum input bypass capacitor
(Cin) is recommended to reduce the sensitivity to input line
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (CAdj) prevents
ripple from being amplified as the output voltage is
increased. A 10
mF capacitor should improve ripple
rejection about 15 dB at 120 Hz in a 10 V application.
Although the LM317M is stable with no output
capacitance, like any feedback circuit, certain values of
external capacitance can cause excessive ringing. An output
capacitance (CO) in the form of a 1.0 mF tantalum or 25 mF
aluminum electrolytic capacitor on the output swamps this
effect and insures stability.
Protection Diodes
When external capacitors are used with any IC regulator
it is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 20 shows the LM317M with the recommended
protection diodes for output voltages in excess of 25 V or
high capacitance values (CO > 25 mF, CAdj > 5.0 mF). Diode
D1 prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
discharging through the IC during an output short circuit.
The combination of diodes D1 and D2 prevents CAdj from
discharging through the IC during an input short circuit.
D1
Vin
Cin
1N4002
LM317M
Vout
R1
+
CO
D2
R2
CAdj
1N4002
Adjust
Vout
Figure 20. Voltage Regulator with
Protection Diodes


Nº de peça semelhante - LM317MBDTRK

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
ON Semiconductor
LM317MBDTRK ONSEMI-LM317MBDTRK Datasheet
232Kb / 16P
   Three-Terminal Adjustable Output Positive Voltage Regulator
August, 2004 ??Rev. 12
LM317MBDTRK ONSEMI-LM317MBDTRK Datasheet
159Kb / 13P
   500 mA Adjustable Output, Positive Voltage Regulator
August, 2006 ??Rev. 14
LM317MBDTRKG ONSEMI-LM317MBDTRKG Datasheet
232Kb / 16P
   Three-Terminal Adjustable Output Positive Voltage Regulator
August, 2004 ??Rev. 12
LM317MBDTRKG ONSEMI-LM317MBDTRKG Datasheet
159Kb / 13P
   500 mA Adjustable Output, Positive Voltage Regulator
August, 2006 ??Rev. 14
More results

Descrição semelhante - LM317MBDTRK

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
ON Semiconductor
LM317M ONSEMI-LM317M_14 Datasheet
141Kb / 14P
   500 mA Adjustable Output Positive Voltage Regulator
August, 2014 ??Rev. 24
LM317M ONSEMI-LM317M_06 Datasheet
159Kb / 13P
   500 mA Adjustable Output, Positive Voltage Regulator
August, 2006 ??Rev. 14
logo
Estek Electronics Co. L...
IL317L ESTEK-IL317L Datasheet
213Kb / 2P
   100 mA Adjustable Output Positive Voltage Regulator
ET-IL317L ESTEK-ET-IL317L Datasheet
178Kb / 2P
   100 mA Adjustable output Positive Voltage Regulator
logo
ON Semiconductor
LM317L ONSEMI-LM317L_11 Datasheet
144Kb / 12P
   100 mA Adjustable Output, Positive Voltage Regulator
March, 2008 - Rev. 11
LM317L ONSEMI-LM317L_V01 Datasheet
337Kb / 15P
   Voltage Regulator - Adjustable Output, Positive 100 mA
April, 2021 - Rev. 14
LM317L ONSEMI-LM317L_05 Datasheet
131Kb / 12P
   100 mA Adjustable Output, Positive Voltage Regulator
October, 2005 ??Rev. 8
logo
Toshiba Semiconductor
TA58MS00F TOSHIBA-TA58MS00F Datasheet
218Kb / 8P
   500-mA Adjustable-Output Voltage Regulator with On/Off Switch
2009-09-30
logo
KODENSHI_AUK CORP.
SN317L KODENSHI-SN317L Datasheet
387Kb / 8P
   [100mA /Adjustable Output] Positive Voltage Regulator
logo
New Japan Radio
NJW4106 NJRC-NJW4106 Datasheet
715Kb / 15P
   HIGH VOLTAGE IO = 500 mA ADJUSTABLE LDO REGULATOR
Ver.1.0
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