Driver powers 10 white LEDs

1 October 2008 Opto-Electronics

Linear Technology has released the LT3593, a high efficiency constant current white-LED driver housed in both 2 x 2 mm DFN and ThinSOT packages. It features a unique high-side LED current sense topology that enables the LED cathode to be connected directly to ground, creating a single wire current source. A single digital control pin enables set-and-forget LED dimming with ratios as high as 32:1.

The driver is designed to drive up to 10 white LEDs from a single Li-Ion cell at efficiencies over 80%. It operates from an input voltage from 2,7 to 5,5 V, optimising it for single cell Li-Ion and multicell alkaline/NiCd/NiMH sources. Its 1 MHz constant switching frequency allows the use of tiny, low profile inductors and capacitors while keeping input and output noise low.

The LT3593 ensures the uniform brightness of each LED by acting as a constant current source, delivering the same current to each white LED, regardless of fluctuations in the LED’s forward voltage drop, which varies with temperature, manufacturing tolerances and age. It uses a single wire digital serial interface to deliver 32:1 linear brightness control. Additional features include output disconnect in shutdown, open LED protection and ±5% reference accuracy.

Further reading:

Panasonic Industry launches its first flat lens, high-performing PIR sensor
Opto-Electronics
Panasonic Industry has announced the launch of its latest innovation in PIR motion sensors: the Flat Wide Detection Type (12 lens), being the first product incorporating its new PaPIRs+ technology.

Read more...

---

Africa’s future internet could be on overland submarine cables
Opto-Electronics
SEACOM aims to explore an innovative new concept: utilising submarine cable technology to address the longstanding challenges in Africa’s terrestrial infrastructure.

Read more...

---

Versatile range of camera modules
EBV Electrolink Opto-Electronics
The CAM-66GY pro-modules from ST are a full range of sample camera modules made for a seamless evaluation and integration of the VD66GY 1,5-megapixel colour image sensor.

Read more...

---

Enhanced breaker status and communication module
Schneider Electric South Africa Opto-Electronics
Schneider Electric has announced the launch of its new Breaker Status and Communication Module (BSCM) Modbus SL/ULP, which delivers enhanced performance, improved connectivity, and simplified integration for power distribution systems.

Read more...

---

Heat-resistant LEDs
Opto-Electronics
Würth Elektronik’s new RGB LEDs are characterised by excellent heat resistance with an insensitivity to temperatures from -40 to 100°C making them ideal solutions for reliable, colour-variable lighting in applications at high operating temperatures.

Read more...

---

PhotoMOS relays
Future Electronics Opto-Electronics
The AQY221R2SX and AQY221R2S PhotoMOS from Panasonic Industry ensures excellent characteristics and high-speed switching performance.

Read more...

---

Mouser now shipping onsemi’s image sensors
TRX Electronics Opto-Electronics
The AR0145CS is a 1/4,3-inch CMOS digital image sensor with a 1280 (H) x 800 (V) active-pixel array that can capture both continuous video and single frames.

Read more...

---

Adaptive optics’ power solution
Altron Arrow Opto-Electronics
Vicor power-dense adaptive optical modules enable colossal telescopes to look into the past for deep space discoveries.

Read more...

---

Ultra-high speed photo detection
Opto-Electronics
TDK Corporation has announced a photo-spintronic conversion element combining optical, electronic, and magnetic elements that can respond at an ultra-high speed of 20 picoseconds.

Read more...

---

High-speed lasers
RFiber Solutions Opto-Electronics
Macom are a high-volume manufacturer of lasers, deploying more than 100 million devices with a reliability of less than 50 FIT and greater than 100 years of wear-out lifetime

Read more...

---