Super barrier rectifier targets retrofit MR16 LED lamps

June 29, 2016 // By Julien Happich
Diodes Incorporated's SBRT3M40P1 is a Trench Super Barrier Rectifier (SBR) specifically optimized 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 12V AC 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 maximizes the 1A bridge rectifier efficiency and power density with only a 0.29V forward-voltage drop in a compact PowerDI 123 footprint of 6.75mm 2. To minimize 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 optimized depending on the waveform’s duty cycle requirements and operating temperature.

A 40V blocking capability normally provides sufficient headroom for a 12V AC 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 0.34V and 0.28V, respectively.

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