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

X  

LM3402MM Folha de dados(PDF) 11 Page - Texas Instruments

Nome de Peças LM3402MM
Descrição Electrónicos  0.5A Constant Current Buck Regulator for Driving High Power LEDs
Download  38 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

LM3402MM Folha de dados(HTML) 11 Page - Texas Instruments

Back Button LM3402MM Datasheet HTML 7Page - Texas Instruments LM3402MM Datasheet HTML 8Page - Texas Instruments LM3402MM Datasheet HTML 9Page - Texas Instruments LM3402MM Datasheet HTML 10Page - Texas Instruments LM3402MM Datasheet HTML 11Page - Texas Instruments LM3402MM Datasheet HTML 12Page - Texas Instruments LM3402MM Datasheet HTML 13Page - Texas Instruments LM3402MM Datasheet HTML 14Page - Texas Instruments LM3402MM Datasheet HTML 15Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 38 page
background image
fSW =
VO
1.34 x 10
-10 x RON
VO = n x VF + 200 mV
LM3402/02HV
CS
VSNS
IF
RSNS
IF
+
-
VREF
+
-
One-shot
CS
Comparator
VO
VF
VF
LED 1
LED n
tON = 1.34 x 10
-10 x
RON
VIN
LM3402, LM3402HV
www.ti.com
SNVS450E – SEPTEMBER 2006 – REVISED MAY 2013
APPLICATION INFORMATION
THEORY OF OPERATION
The LM3402 and LM3402HV are buck regulators with a wide input voltage range, low voltage reference, and a
fast output enable/disable function. These features combine to make them ideal for use as a constant current
source for LEDs with forward currents as high as 500 mA. The controlled on-time (COT) architecture is a
combination of hysteretic mode control and a one-shot on-timer that varies inversely with input voltage.
Hysteretic operation eliminates the need for small-signal control loop compensation. When the converter runs in
continuous conduction mode (CCM) the controlled on-time maintains a constant switching frequency over the
range of input voltage. Fast transient response, PWM dimming, a low power shutdown mode, and simple output
overvoltage protection round out the functions of the LM3402/02HV.
CONTROLLED ON-TIME OVERVIEW
Figure 19 shows the feedback system used to control the current through an array of LEDs. A voltage signal,
VSNS, is created as the LED current flows through the current setting resistor, RSNS, to ground. VSNS is fed back
to the CS pin, where it is compared against a 200 mV reference, VREF. The on-comparator turns on the power
MOSFET when VSNS falls below VREF. The power MOSFET conducts for a controlled on-time, tON, set by an
external resistor, RON, and by the input voltage, VIN. On-time is governed by the following equation:
(1)
At the conclusion of tON the power MOSFET turns off for a minimum off-time, tOFF-MIN, of 300 ns. Once tOFF-MIN is
complete the CS comparator compares VSNS and VREF again, waiting to begin the next cycle.
Figure 19. Comparator and One-Shot
The LM3402/02HV regulators should be operated in continuous conduction mode (CCM), where inductor current
stays positive throughout the switching cycle. During steady-state operationin the CCM, the converter maintains
a constant switching frequency, which can be selected using the following equation:
(2)
VF = forward voltage of each LED, n = number of LEDs in series
(3)
Copyright © 2006–2013, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: LM3402 LM3402HV


Nº de peça semelhante - LM3402MM

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
National Semiconductor ...
LM3402MM NSC-LM3402MM Datasheet
844Kb / 22P
   0.5A Constant Current Buck Regulator for Driving High Power LEDs
LM3402MM NSC-LM3402MM Datasheet
560Kb / 24P
   0.5A Constant Current Buck Regulator for Driving High Power LEDs
logo
Texas Instruments
LM3402MM TI1-LM3402MM Datasheet
570Kb / 30P
[Old version datasheet]   LM3402/LM3402HV 0.5A Constant Current Buck Regulator for Driving High Power LEDs
LM3402MM TI1-LM3402MM Datasheet
1Mb / 39P
[Old version datasheet]   0.5A Constant Current Buck Regulator
LM3402MM/NOPB TI1-LM3402MM/NOPB Datasheet
1Mb / 39P
[Old version datasheet]   0.5A Constant Current Buck Regulator
More results

Descrição semelhante - LM3402MM

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Texas Instruments
LM3402 TI1-LM3402_14 Datasheet
1Mb / 36P
[Old version datasheet]   0.5A Constant Current Buck Regulator for Driving High Power LEDs
logo
National Semiconductor ...
LM3402 NSC-LM3402_08 Datasheet
560Kb / 24P
   0.5A Constant Current Buck Regulator for Driving High Power LEDs
LM3402 NSC-LM3402 Datasheet
844Kb / 22P
   0.5A Constant Current Buck Regulator for Driving High Power LEDs
logo
Texas Instruments
LM3402 TI1-LM3402_11 Datasheet
570Kb / 30P
[Old version datasheet]   LM3402/LM3402HV 0.5A Constant Current Buck Regulator for Driving High Power LEDs
logo
ON Semiconductor
NCL30161 ONSEMI-NCL30161 Datasheet
126Kb / 8P
   Constant-Current Buck Regulator for Driving High Power LEDs
May, 2013 ??Rev. 0
NCV30161 ONSEMI-NCV30161 Datasheet
252Kb / 10P
   Constant-Current Buck Regulator for Driving High Power LEDs
June, 2019 ??Rev. 1
logo
Texas Instruments
LM3406 TI1-LM3406_15 Datasheet
1Mb / 38P
[Old version datasheet]   Constant Current, Buck Regulator for Driving High Power LEDs
logo
ON Semiconductor
NCL30160 ONSEMI-NCL30160 Datasheet
222Kb / 10P
   1.0A Constant-Current Buck Regulator for Driving High Power LEDs
January, 2012 ??Rev. 1
logo
National Semiconductor ...
LM3406 NSC-LM3406 Datasheet
479Kb / 26P
   1.5A Constant Current Buck Regulator for Driving High Power LEDs
LM3406 NSC-LM3406_09 Datasheet
523Kb / 26P
   1.5A Constant Current Buck Regulator for Driving High Power LEDs
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38


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