Barrier rectifier for MR16 lamps
13 July 2016
Power Electronics / Power Management
The SBRT3M40P1 Trench Super Barrier Rectifier (SBR) introduced by Diodes Incorporated has been optimised to deliver a low forward-voltage drop in a small form factor while maintaining low reverse-current leakage. This capability addresses requirements for input bridge rectifiers in solid-state lighting (SSL) applications focused on 12 V a.c. LED retrofit lamps, which provide a more efficient and longer life alternative to popular MR16 halogen bulbs.
Operating at +125°C, this 40 V rated device has a low reverse-current leakage of only 1,2 mA at 12 V blocking, which provides immunity to thermal runaway under the high ambient temperature environment of an MR16 retrofit. Furthermore, it maximises the 1 A bridge rectifier efficiency and power density with only a 0,29 V forward-voltage drop in a compact PowerDI 123 footprint of 6,75 mm².
To minimise forward loss, the SBRT3U40P1 is an alternative device that provides a lower forward-voltage drop of 0,25 V at the expense of an increase in the reverse-current leakage to 4 mA. Options for different forward loss and reverse leakage enable the rectification circuit to be optimised depending on the waveform’s duty cycle requirements and operating temperature.
A 40 V blocking capability normally provides sufficient headroom for a 12 V a.c. input supply, however, if the line regulation is poor then the SBRT3M60P1 and SBRT3U60P1, with their 60 V blocking capability, give extra headroom at the expense of their slightly higher forward-voltage drop of 0,34 V and 0,28 V, respectively.
While a conventional SMA package option is available, the PowerDI 123 package offers a smaller footprint (6,75 mm² compared to 16 mm²) and lower height profile (<1 mm compared to 2 mm) for space-critical applications like the target MR16 retrofit bulb market.
For more information contact Michael Nel, Avnet South Africa, +27 (0)11 319 8600, michael.nel@avnet.eu, www.avnet.co.za
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