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Controller increases capacity of multiple modules

Posted: 17 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:controller? telecommunications? DC/DC?

Intersil Corp. has released the ISL8107, a single-phase, non-synchronous buck controller that provides maximum efficiency and flexibility for telecommunications and industrial designs. The controller fits routers and switchers, point-of-load modules, and distributed DC/DC power architecture applications.

The ISL8107 has an ultrawide operating input voltage range from 9V to 75V, with an internal 1.192V reference voltage tolerance of 1 percent over industrial temperature ranges. It integrates a high-side N-channel MOSFET driver, which can be used to drive a MOSFET that is attached to the positive supply and is not ground-referenced.

Using voltage-mode control with feed-forward compensation, the controller claims optimal transient response and a constant loop gain over the input voltage range. The IC's switching frequency can be programmed from 100KHz to 600KHz with an external resistor and capacitor. Switching frequencies can be synchronized to an external clock signal through the Sync pin.

The ISL8107 also provides programmable soft-start, hiccup mode for short-circuit protection, and over-temperature protection. "Over-current protection is reached using the MOSFET's Rds(on) sensing, which simplifies the implementation while maintaining converter efficiency," Intersil said.

-Gina Roos

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