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, [email protected], www.avnet.co.za

Further reading:

NVDC power-path control to 1– 6 cell battery systems
iCorp Technologies Power Electronics / Power Management
SG Micro’s SGM41581 is an I2C-controlled narrow voltage direct charging buck boost charge controller designed to simplify robust power delivery in systems that must seamlessly operate from an adapter input or a battery pack.

Read more...

---

Precise, adaptive battery health-monitoring
RS South Africa Power Electronics / Power Management
New fuel gauge solution from Nordic delivers State-of-Health reporting, adaptive battery modelling, and seamless fleet observability via nRF Cloud.

Read more...

---

Compact 6 A automotive buck converter
Altron Arrow Power Electronics / Power Management
Delivering up to 6 A of continuous output current, the DCP0606Y from STMicroelectronics enables efficient regulation of low-voltage rails commonly used in modern vehicle electronics and industrial systems.

Read more...

---

The new role of UPS technology in high-precision automation
Omron Electronics Power Electronics / Power Management
OMRON’s BU_2SW and BU_2RWL series UPS systems are engineered to offer a robust, online type power architecture designed to safeguard sensitive AC powered systems across a wide range of industries.

Read more...

---

Rugged railway-grade DC-DC power modules
iCorp Technologies Power Electronics / Power Management
iCorp Technologies has introduced the AIPUPOWER ZCD100 and ZCD150 Series, a family of rugged DC-DC converters designed to meet the demanding electrical and environmental requirements of railway and transportation systems.

Read more...

---

Four-quadrant regenerative grid simulator
Conical Technologies Power Electronics / Power Management
The IT7900EP series high-performance regenerative grid simulator from ITECH is a full four-quadrant AC grid simulator capable of both sourcing and sinking power.

Read more...

---

90 W PSU with 150% boost capability
Brabek Power Electronics / Power Management
RECOM’s cost effective REFIN2U-S90/CL DIN rail AC/DC boasts a 90 W rating with a boost capability of 150% for 4,5 seconds to allow for surge loads.

Read more...

---

Standalone USB PD controller
Future Electronics Power Electronics / Power Management
The STUSB4531 from STMicroelectronics is a standalone USB Power Delivery sink controller designed to streamline the implementation of USB-C power negotiation in sink devices without requiring a full software stack on a host microcontroller.

Read more...

---

Power module enhances AI data centre power density
Altron Arrow Power Electronics / Power Management
Microchip’s MCPF1525 power module with PMBus delivers 25 A DC-DC power and is stackable up to 200 A.

Read more...

---

MIL-Spec DC-DC power converters
Vepac Electronics Power Electronics / Power Management
PowerGood has introduced a range of 15 W to 600 W military DC-DC power converters engineered for mission critical defence applications.

Read more...

---