Moteur de recherche de fiches techniques de composants électroniques |
|
LM3551 Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
|
|
LM3551 Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
1 / 15 page LM3551/LM3552 1A White LED Driver with Flash Timeout Protection General Description The LM3551 and LM3552 are fixed frequency, current mode step-up DC/DC converters with two integrated NFETs that can be used for precision LED brightness control. The de- vices are capable of driving loads up to 1A from a single-cell Li-Ion battery. The LM3551 and LM3552 can drive one or more high current flash LEDs either in a high power Flash mode or a lower power Torch mode using the TORCH/FLASH pin. A program- mable Timeout function on the FTO pin forces the internal NFETs to turn off after a certain user defined time. An external SD pin (LM3551) or EN pin (LM3552) is available to put the device into low power shutdown mode. During shut- down, the feedback resistors and the load are disconnected from the input to avoid leakage current paths to ground. User programmable soft-start circuitry has been integrated to eliminate large inrush currents at start-up. Over-voltage protection circuitry and a 1.25MHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings. The LM3551 and LM3552 are available in a low profile 14 pin LLP package. Features n Up to 1A total drive current n Flash timeout protection n Independent Torch/Flash/Shutdown modes n LED disconnect in shutdown n Programmable soft-start limits inrush current n Over-voltage protection n Wide voltage range 2.7 to 5.5V n 1.25MHz constant switching frequency n Small, low profile package, non-pullback LLP14 (4mm x 4mm) Applications n White LED Camera Flash n White LED Torch (Flashlight) n DSC (Digital Still Camera) Flash n Cellular Camera Phone Flash n PDA Camera Flash n Camcorder Torch (Flashlight) lamp Typical Application Circuits 20151205 February 2006 © 2006 National Semiconductor Corporation DS201512 www.national.com |
Numéro de pièce similaire - LM3551_06 |
|
Description similaire - LM3551_06 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants All Rights Reserved©Alldatasheet.com |
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 |