LM3556
Dispositivo de flash de cámara LED inductivo en blanco de 1.5 A LM3556
LM3556
- Grounded Cathode LED Operation for Improved Thermal Management
- 1.5-A High-Side Current Source for Single LED
- Accurate and Programmable LED Current from 46.9 mA to 1.5 A
- > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
- Small Solution Size: < 20 mm2
- LED Thermal Sensing and Current Scale-Back
- Soft-Start Operation for Battery Protection
- Hardware Enable Pin
- Hardware Torch Enable
- Hardware Strobe Enable
- Synchronization Input for RF Power Amplifier Pulse Events
- VIN Flash Monitor Optimization
- 400-kHz I2C-Compatible Interface
- I2C-Compatible Programmable NTC Trip Point
- 0.4-mm Pitch, 16-Pin DSBGA Package
The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
The LM3556 is controlled via an I2C-compatible interface. Features include: a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse, a hardware torch enable (TORCH) for Movie Mode or flashlight functions, a TX input which forces the flash pulse into a low-current Torch Mode allowing for synchronization to RF power amplifier events or other high-current conditions, and an integrated comparator designed to monitor an NTC thermistor and provide an interrupt to the LED current. With a fast 1-μs transition from 0 mA to
46.9 mA, the TORCH input pin can be used to develop custom LED current waveforms.
The 4-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to +85°C temperature range.
For all available packages, see the orderable addendum at the end of the data sheet.Documentación técnica
Tipo | Título | Fecha | ||
---|---|---|---|---|
* | Data sheet | LM3556 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source datasheet (Rev. D) | PDF | HTML | 23 oct 2015 |
White paper | Common LED Functions and LED Driver Design Considerations | 21 sep 2020 | ||
Selection guide | Power Management Guide 2018 (Rev. R) | 25 jun 2018 | ||
Application note | AN-2259 1.5A Synchronous Boost LED Flash Drvr w/ High-Side Cur Source Eval Board (Rev. A) | 30 abr 2013 |
Diseño y desarrollo
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
LM355XSW-LINUX — Controlador Linux para LM355X
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lm3554
- lm3556
Linux Source Files
(...)
PSPICE-FOR-TI — PSpice® para herramienta de diseño y simulación de TI
Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
---|---|---|
DSBGA (YFQ) | 16 | Ultra Librarian |
Pedidos y calidad
- RoHS
- REACH
- Marcado del dispositivo
- Acabado de plomo/material de la bola
- Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
- Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
- Contenido del material
- Resumen de calificaciones
- Monitoreo continuo de confiabilidad
- Lugar de fabricación
- Lugar de ensamblaje
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