Isolated power supply control ICs for auxiliary supply

16 September 2016

ROHM announced the availability of isolated flyback-type DC/DC converter control ICs for Auxiliary Supply in High Power Industrial equipment.

Following the BD7F100, the company now expands the series with the new BD7F200, covering all applications with a power requirement from 1W to 10W, and including two different packaging options. In addition, ROHM introduces a BD7F100 evaluation kit that facilitates the design of flyback isolated applications. 

Isolation is almost always built into electronic equipment to provide protection against shock and damage. With this respect, a broad range of applications such as power metering, industrial programmable logic controllers (PLCVs), Industrial Fieldbus, Industrial automation, insulated-gate bipolar transistor (IGBT) and SiC MOSFET gate drivers require isolated DC/DC converters. These devices provide galvanic isolation, improve safety and enhance noise immunity to the systems. With them it is possible to generate multiple output voltage rails and dual polarity (positive and negative) rails. High voltage, high power industrial applications (including power storage systems and solar inverters which are seeing increased adoption) are no exception, requiring even more stringent reliability demands due to the harsher temperature conditions and the need for continuous, long-term operation.

Conventional solutions utilise an optocoupler and other components for flyback-type isolated power supply control for the feedback loop. However, this generates challenges associated with current consumption and reliability (including circuit scale and product life). The BD7F series, thanks to its optocoupler-less architecture, allows designers to simplify the development of the transformer and to reduce costs. 

It decreases the number of external parts by nearly half by eliminating the need for a photocoupler and a phase compensation network, providing greater energy savings, reliability, and miniaturisation. In addition, a newly developed adaptive ON time control method is used to improve load response time (a drawback of conventional isolated power supply ICs), while voltage fluctuation during the load transient is limited to under 200mV, contributing to even higher reliability. Various protection functions add to it as well.

In order to offer further support to designers during the device evaluation, and consequentially, in the application design phase, ROHM is also releasing a new evaluation kit BD7F100HFN-EVK-001, implementing the BD7F100HFN and featuring 6 different input and output configurations.

Samples, along with this evaluation board, will be available for purchase. This board enables designs for 24V input voltage and 5V output voltage with output current range of 13.8mA to 800mA for maximum output power of 4W.

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