Vishay Intertechnology has announced two new controller ICs for intermediate bus converter (IBC) applications that are the first such single-chip devices on the market to integrate high-voltage (75-V) half-bridge MOSFET drivers with a 1.6-A peak current driving capability, as well as a full range of current monitoring and control features.
The new Vishay Siliconix SiP11205 and SiP11206 controllers are designed to work on the primary side of an isolated half-bridge IBC in telecom and network equipment and in 1/16 or 1/8 power modules where standard bus voltages such as 48-V need to be converted to 12-V or lower intermediate voltages. The new devices simplify designs and reduce solution costs by eliminating the need for separate controller and high-voltage MOSFET driver components for secondary synchronous rectification, while their half-bridge architecture further reduces costs and space requirements by enabling the use of lower-voltage components.
The SiP11205 and SiP11206 controllers step down voltages with >95 % efficiency. They feature an input voltage range of 36-V to 75-V and comfortably handle 100-V transients for 100 ms in compliance with ETSI 300-132-2. Integrated +/-1.6-A high-voltage MOSFET drivers allow each IC to drive both the low- and high-side switching devices in a half-bridge converter. The oscillator frequency is programmable from 200 kHz to 1 MHz, the widest such range in the industry, and can be synchronized to an external sync source. Self-driven synchronous rectification eliminates the requirement for secondary-side MOSFET drivers and isolated pulse drivers, reducing costs and simplifying designs.
