Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

LM3552 Datenblatt(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM3552
Bauteilbeschribung  1A White LED Driver with Flash Timeout Protection
Download  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3552 Datenblatt(HTML) 9 Page - National Semiconductor (TI)

Back Button LM3552 Datasheet HTML 5Page - National Semiconductor (TI) LM3552 Datasheet HTML 6Page - National Semiconductor (TI) LM3552 Datasheet HTML 7Page - National Semiconductor (TI) LM3552 Datasheet HTML 8Page - National Semiconductor (TI) LM3552 Datasheet HTML 9Page - National Semiconductor (TI) LM3552 Datasheet HTML 10Page - National Semiconductor (TI) LM3552 Datasheet HTML 11Page - National Semiconductor (TI) LM3552 Datasheet HTML 12Page - National Semiconductor (TI) LM3552 Datasheet HTML 13Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 15 page
background image
Block Diagram
20151203
Circuit Description
OVERVIEW
The LM3551/2 are high power white LED flash drivers ca-
pable of delivering up to 1A of output current. The devices
utilize a highly efficient inductive DC/DC boost converter to
achieve the required output voltage. A current-mode PWM
control scheme regulates the output current over a wide
input voltage range. Both the LM3551 and the LM3552 have
two low-side load disconnect FET’s allowing for a continuous
low-power Torch-mode and a high-power, short duration
Flash-mode.
Several application specific safety features are integrated
into the LM3551/2 design. A flash timeout circuit is present
on-chip to prevent a failure in the flash LED caused by a
timing violation. Over-Voltage Protection protects the output
capacitor, inductor and main power switch in the event of an
open circuit condition. Other safety features include inductor
current limit, thermal shutdown, and an undervoltage lock-
out.
CIRCUIT COMPONENTS
Inductive DC/DC Boost Converter
In order to achieve the output voltages required to power
high power white LEDs, the LM3551 and LM3552 utilize a
highly efficient inductive DC/DC converter. The boost con-
verter utilizes a current-mode controlled, constant frequency
(1.25MHz.), PWM architecture. This architecture creates a
predictable noise spectrum that allows for easy filtering and
low noise. A very low on-resistance power NFET(R
DSON =
0.165
Ω) and high value current limit (2.2A typ.) help effi-
ciently provide a high power output (700mA@5V) over the
entire lithium-ion voltage range. The feedback voltage for
both the LM3551 and LM3552 is tightly regulated to 1.265V.
SD/EN Pin
The LM3551 and LM3552 provide two different options in
regards to turn-on control logic. The LM3551 utilizes a shut-
down pin (SD) that turns on the part when a voltage less than
0.3V is applied. An internal 1.2M
Ω pull-up to V
IN is provided
to place the LM3551 into shutdown when no control signal is
provided. The LM3552 utilizes a enable pin (EN) that turns
on the part when a voltage greater than 1.2V is applied. An
internal 1.2M
Ω pull-down to GND is provided to place the
LM3552 into shutdown when no control signal is provided.
Low-side Load Disconnect FETs
The LM3551 and LM3552 have two low-side load disconnect
NFETs (FET-T and FET-F) that provide the physical mecha-
nism of Torch Mode and Flash Mode. In Torch Mode, FET-T
is enabled allowing current to flow through it. FET-T has an
on-resistance of 0.98
Ω and is capable of handling currents
up to 200mA. In Flash Mode, both FET-T and FET-F are
enabled. FET-F has an on-resistance of 0.36
Ω and is ca-
pable of handling currents up to 500mA. The total Flash
current is equal to the sum total of the current flowing
through FET-T and FET-F. See the CURRENT SET EQUA-
TIONS in the Application Informations section for more infor-
mation regarding setting LED current .
In shutdown mode, the LM3551/2 provide a true load dis-
connect helping to keep the total shutdown current to a
minimum.
Over-Voltage Protection (OVP)
The over voltage protection (OVP) is engaged when a failure
mode occurs (FB pin grounded, Flash LED becomes open or
disconnected, etc.). In the event of a failure, OVP prevents
the output voltage from exceeding 12.4V (typ). When the
OVP level is reached, the switch FET shuts off preventing
the output voltage from climbing higher. Once the FET has
shut off, the output will droop at a rate determined by the
value of the output capacitor and current leakage through
the OVP pin and any other leakage path. When the output
www.national.com
9


Ähnliche Teilenummer - LM3552

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
National Semiconductor ...
LM3552 NSC-LM3552 Datasheet
752Kb / 15P
   1A White LED Driver with Flash Timeout Protection
logo
Texas Instruments
LM3552 TI1-LM3552 Datasheet
1Mb / 23P
[Old version datasheet]   1A White LED Driver with Flash Timeout Protection
LM3552 TI1-LM3552 Datasheet
1Mb / 23P
[Old version datasheet]   1A White LED Driver with Flash Timeout Protection
logo
National Semiconductor ...
LM3552SD NSC-LM3552SD Datasheet
752Kb / 15P
   1A White LED Driver with Flash Timeout Protection
logo
Texas Instruments
LM3552SD/NOPB TI1-LM3552SD/NOPB Datasheet
1Mb / 23P
[Old version datasheet]   1A White LED Driver with Flash Timeout Protection
More results

Ähnliche Beschreibung - LM3552

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
National Semiconductor ...
LM3551 NSC-LM3551_06 Datasheet
752Kb / 15P
   1A White LED Driver with Flash Timeout Protection
logo
Texas Instruments
LM3551 TI1-LM3551_14 Datasheet
1Mb / 23P
[Old version datasheet]   1A White LED Driver with Flash Timeout Protection
LM3551 TI1-LM3551 Datasheet
1Mb / 23P
[Old version datasheet]   1A White LED Driver with Flash Timeout Protection
logo
Silan Microelectronics ...
SD42509 SILAN-SD42509 Datasheet
606Kb / 7P
   1A WHITE LED DRIVER
SD42511 SILAN-SD42511 Datasheet
645Kb / 9P
   1A WHITE LED DRIVER WITH PWM DIMMING CONTROLLER
logo
Monolithic Power System...
MP24183 MPS-MP24183 Datasheet
442Kb / 12P
   1A, 55V, Programmable Frequency White LED Driver
logo
National Semiconductor ...
LM2759 NSC-LM2759_10 Datasheet
1Mb / 14P
   1A Switched Capacitor Flash LED Driver with I2C Compatible Interface
logo
Texas Instruments
LM2759 TI1-LM2759_17 Datasheet
2Mb / 22P
[Old version datasheet]   1A Switched Capacitor Flash LED Driver with I2C Compatible Interface
logo
ON Semiconductor
NCP5050 ONSEMI-NCP5050 Datasheet
161Kb / 14P
   4.5 W Flash White LED Boost Driver
October, 2007 - Rev. 0
logo
Monolithic Power System...
MP3204 MPS-MP3204 Datasheet
267Kb / 8P
   1.3MHz Fixed Frequency 5 White LED Driver with Open LED Protection
More results


Html Pages

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


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