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PWM controllers trim output capacitance

Posted: 08 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:PWM? controller? telecom?

Micrel Inc. has unveiled a new line of pulse-width modulation (PWM) controllers dubbed the Hyper Speed Control family, which features architecture that reduces the required output capacitance and allows for excellent transient response, while making high delta V operation (VIN=28V, VOUT=0.8V) possible. This makes the controllers suitable for STBs, gateways, routers, computing peripherals and telecom/networking equipment.

John T. Lee, director of power products at Micrel said, "The huge advantage gained by our digitally modified hyper speed architecture is high speed, resulting in a smaller footprint and lower system-level cost for our customers." He added that the benefits include reduced BOM cost and world class transient response for cost-sensitive applications such as STB, graphic cards and servers.

Micrel's new devices are constant on-time mode PWM controllers that feature wide input voltage range, high performance, and are capable of driving up to 25A of load current. The MIC2164 operates at 300kHz PWM frequency while MIC2164-2 and MIC2164-3 operate at 600kHz and 1MHz respectively, to allow a size reduction path. The family achieves greater than 95 percent efficiency, while still switching at high frequencies, over a broad load range. The MIC2164 Hyper Speed Control family of PWM controllers operates over a wide input supply range of 3V to 28V and also offers cycle-by-cycle current limiting for FET protection. While the UVLO circuitry ensures proper operation under power-sag conditions to prevent the MOSFETs from overheating, the Soft Start feature reduces the inrush current. It also features built-in compensation with an external ripple injection circuit. The MIC2164 Hyper Speed Control family of PWM controllers is available in a 10-pin MSOP package with a junction operating range from -40C to +125C.

The MIC2164 is currently available in volume quantities with pricing starting at $0.72 for 1K quantities while MIC2164-2 and MIC2164-3 are priced at $0.77 and $0.82 for 1K quantities respectively.

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