|
|
Driver for LED retrofit lamps
11 May 2011, Opto-Electronics
The first in a new family of mains-operated LED lamp drivers from STMicroelectronics aims to enable designers to deliver more reliable and efficient LED retrofit lamps featuring primary-side current regulation.
The new HVLED805 integrates an 800 V avalanche-rugged MOSFET, achieved using ST’s high-voltage integration process. The high-voltage on-chip startup circuitry allows the device to start reliably when the AC line voltage is applied to the lamp. Primary-side regulation maintains the constant LED current that is needed to ensure consistent light output, without requiring the current-sensing components and optocoupler used in conventional secondary-side regulation. The elimination of these components decreases the cost and size of the LED driving circuitry and saves current-sensing losses, improving overall efficiency.
Using PSR, the HVLED805 guarantees LED current regulation to within 5% accuracy. Reliability is also enhanced, due to the elimination of the optocoupler on the secondary side, whose degradation can significantly decrease the mean-time-between-failure of the lamp. The PSR controller integrates high-voltage startup for efficient power-on, and the robust 800 V power MOSFET allows a reduction of the snubber network. The highly efficient quasi-resonant operating mode further boosts energy savings and reduces the EMI filtering required. |
|
|
|
| Share: |
 |
Via email client |
 |
 |
 |
 |
print |
|
|
|
|
|
Further reading:
- Balancing performance, speed and cost for rugged interconnects
25 September 2019, Avnet South Africa, Interconnection
System designers want the smallest and lightest possible connectors for use in aerospace and military electronics, while industrial and transportation electronics are expected to deal with the same harsh environments at more competitive cost points.
- Table-top instrument enclosures
25 September 2019, Avnet South Africa, Enclosures, Racks, Cabinets & Panel Products
The Evotec range of table-top plastic enclosures, made by OKW, is suitable for for tough working environments in applications such as measurement and control engineering, IT, medical, laboratory and environmental ...
- Qi-compliant wireless charging coils
28 August 2019, Avnet South Africa, Passive Components
Vishay has expanded its offering of Qi-compliant wireless charging transmitter and receiver coils with the introduction of 14 new products in industry-standard shield sizes.
Consisting of eight single-coil ...
- LED flicker, and how to prevent it
28 August 2019, Avnet South Africa, Opto-Electronics
With the growing popularity of LED lighting, especially now that very cheap LED luminaires are coming to the market, flicker is becoming more of a problem.
Flicker, a repetitive switching on and off ...
- Digital fibre-optic sensor
28 August 2019, Vepac Electronics, Opto-Electronics
The DFS digital fibre-optic sensor series from Tri-Tronics is designed to provide reliable detection using plastic fibre-optic light guides.
The slim-line housing with protective lid will fit in a variety ...
- All-in-one light pipe system
28 August 2019, Vepac Electronics, Opto-Electronics
Bivar’s Zero Light Bleed adaptor technology, with built-in surface-mount LED, channels light directly to the lens, eliminating disruptive light bleed.
The all-in-one adaptor system is built with optimum ...
- 3 Watt DC-DC converters
28 August 2019, Avnet South Africa, Power Electronics / Power Management
Aimtec has introduced three new series of switching regulators – the AMSRB1-78JZ, AMSRL1-78JZ and AMSRL-78JZ – all meeting the EN62368 standard and suitable for IoT (Internet of Things) applications.
The ...
- Buck converter with low quiescent current
31 July 2019, Avnet South Africa, Power Electronics / Power Management
Texas Instruments introduced an ultra-low-power switching regulator with what it claims is the industry’s lowest operating quiescent current (IQ) at 60 nA. The TPS62840 synchronous step-down converter ...
- MCUs with industrial communication interfaces
31 July 2019, Avnet South Africa, DSP, Micros & Memory
Texas Instruments introduced new communications capabilities on its C2000 microcontrollers (MCUs). C2000 F2838x devices enable designers to use a single chip to implement connectivity, including EtherCAT, ...
- High-intensity colour LEDs
31 July 2019, Würth Elektronik eiSos, Opto-Electronics
Würth Elektronik has expanded its LED portfolio with a particularly compact model family. The WL-SMCC series of SMT chip LEDs, available in 0402 and 0603 packages, is characterised by a full-surface lens ...
- A quick guide to multi-standard mesh networking
31 July 2019, Avnet South Africa, Telecoms, Datacoms, Wireless, IoT
Recent advances in wireless technology have enabled the use of mesh network topologies in home and building control applications.
Low-cost IoT technology is driving the launch of devices such as smart ...
- RGB LEDs for decorative lighting
26 June 2019, Würth Elektronik eiSos, Opto-Electronics
Würth Elektronik’s new WL-SFTW and WL-SFTD series of RGB LEDs are targeted at accent and decorative lighting, optical displays as well as industrial applications. Thanks to their PLCC contacting design, ...
|
|
