Super barrier rectifier suits retrofit MR16 LED lamps

28th June 2016

Nat Bowers

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Datasheet

Designed to deliver a low forward-voltage drop in a small form factor while maintaining low reverse-current leakage, the SBRT3M40P1 Trench Super Barrier Rectifier (SBR) has been introduced by Diodes Incorporated. This capability addresses requirements for input bridge rectifiers in SSL applications focused on 12VAC LED retrofit lamps, which provide a more efficient and longer life alternative to popular MR16 halogen bulbs.

Operating at +125°C, this 40V rated Trench SBR, has a low reverse-current leakage of only 1.2mA at 12V blocking, which provides immunity to thermal runaway under the high ambient temperature environment of an MR16 retrofit. Furthermore, it maximises the 1A bridge rectifier efficiency and power density with only a 0.29V forward-voltage drop.

To minimise forward loss, the SBRT3U40P1 is an alternative device that provides a lower forward-voltage drop of 0.25V at the expense of an increase in the reverse-current leakage to 4mA. 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 40V blocking capability normally provides sufficient headroom for a 12VAC input supply. However, if the line regulation is poor then the SBRT3M60P1 and SBRT3U60P1, with their 60V blocking capability, give extra headroom at the expense of their slightly higher forward-voltage drop of 0.34 and 0.28V, respectively.

While a conventional SMA package option is available, the PowerDI123 package offers a smaller footprint (6.75mm² compared to 16mm²) and lower height profile (under 1mm compared to 2mm) for space-critical applications like the target MR16 retrofit bulb market.

In quantities of 3,000 unit quantities, the SBRT3M/U SBRs are priced at $0.12 each.