Quarter Brick Digital DC-DC Converter for RFPA Applications

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Provides high efficiency complete monitoring functionality and feedback loop control to help stabilisation

Flex Power Modules has launched the BMR683, a new series of digital PMBus DC-DC converters that provide indispensable monitoring functionality and control of the feedback loop to help stabilization. The new converter family aims at radio frequency power amplifier (RFPA) applications and infrastructure for the 5G telecom market.

The high-density BMR683 saves valuable board space and has an output power of up to 500 W at 28 Vout and an input voltage range of 36 V to 60 V.

Delivering an excellent price/performance ratio, it has a high efficiency at 95.5 per cent at full load and a broad output voltage adjustment range of 14 V to 35 V, allowing for easy optimization of the connected RF section.

For RFPA applications using 28 V gallium nitride (GaN) or laterally diffused MOSFET (LDMOS) power amplifier designs, the high-power converter provides a digital PMBus interface to allow easy monitoring of input and output voltages, output current and device temperature.

Wide Configurability

The device also allows users to configure several aspects of the device operation including voltage and current for improved fault tolerance and optimization of the module’s control loop for stable operation in a wide range of circumstances. Power management features also include configurable soft start/stop, precision delay and ramp-up.

Sophisticated over-voltage, over-temperature and short-circuit protection mechanisms enable an extended operational lifespan, with a mean time between failures (MTBF) of over 5 million hours (Mh).

Olle Hellgren, Director Product Management and Business Development at Flex Power Modules, said: “The BMR683 combines exceptional efficiency, power density and reliability with increased design flexibility and monitoring functionality by including a digital interface for the first time for GaN and LDMOS RFPA applications. The control optimization especially makes this new solution ideal for dealing with the load fluctuations in FPGA applications.”

As with all Flex Power Modules’ DC-DC converters, these units comply with IEC/EN/UL 62368-1 safety standards. The devices offer an operational temperature range of -40 degrees Celsius to +125 degrees Celsius. The DC-DC converter comes in an industry-standard quarter-brick and measures 58.4 x 36.8 x 12.7 mm (2.3 x 1.45 x 0.5 in).


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