Chipset Fosters DC/DC Apps

Designed for isolated or non-isolated dc/dc converter applications, the IR2086S controller teams with the 100V IRF6644 and IRF6655 or 40V IRF6613 and IRF6614 DirectFET MOSFETs, creating a three-piece chipset for wide range input (36V to 75V) and 48V fixed input systems. The IR2086S controller IC is optimized for bus converter applications, using a self-oscillating 50% fixed duty cycle. It features an integrated soft-start capacitor that gradually increases duty cycle to 50% over 2,000 cycles to limit in-rush current and maintain equal pulse widths. Other features include hiccup current-limit protection, ±1.2A gate drive current, adjustable deadtime from 50 to 200 ns, and a programmable switching frequency up to 500 kHz. The MOSFETs employ the company’s latest trench technology with DirectFET packaging, said to yield reductions in key specifications such as on resistance and gate charge. Price for the IR2086S is $2.49 each/10,000. MOSFET prices range from $0.48 to $1.47 each/10,000. For more information, contact Wayne Yoshida at INTERNATIONAL RECTIFIER, El Segundo, CA. (310) 252-7726.