Digital DC-DC converter for RF energy amplifier purposes

15-04-2021 | Flex Power Module | power

Flex Power Modules has launched the BMR685, the first digital DC-DC converter for RF power amplifiers in half-brick form factor, which offers a continuous output power of up to 1300 W.

As the telecommunications infrastructure moves to 5G, the RFPA is becoming more and more power hungry, and RF power amplifier designers are switching from LDMOS to GaN transistors. Overall, there is a need for highly efficient DC-DC converters to provide the power required in a compact housing. The resilience of the device makes it ideal for these high performance RF power amplifier applications, both LDMOS and GAN that require a 50V rail.

The new converter generates a high degree of efficiency of up to 97.2% at half load. It offers an output voltage range of 25 V to 55 V and can deliver an output current of up to 26 A. Its input voltage range is 36 V to 75 V and the isolation between input and output is 2250 V.

The device has digital functions that can be accessed via a PMBus interface. This enables easy monitoring of temperature, voltage and current as well as easy setting of the output voltage. It is supported by the Flex Power Designer software tool.

The converter offers an operating temperature range of -40 ° C to + 125 ° C with 100% available power at a base plate temperature of 100 ° C. It includes comprehensive overvoltage, overtemperature and short-circuit protection mechanisms that guarantee a long service life with an MTBF of over 4 Point to 97 million hours.

David Xie, director of research and development and product management for Flex Power Modules, said, “RF power amplifier applications continue to demand more power without compromising efficiency or features. The BMR685 has all of these needs and more in one compact package that is simple to be integrated into power amplifier designs. “

The device is supplied in the half-brick format customary in the industry and measures 61 mm x 57.9 mm x 12.7 mm (2.4 “x 2.28” x 0.5 “). It meets the safety requirements of IEC / EN / UL 62368- 1.

Electronica China, Shanghai April 14-16, 2021.

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