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Offline switcher lowers design component count

Posted: 08 Jul 2003 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? power switch? viper53? mdmesh? mosfet?

STMicroelectronics has introduced an offline primary power switch that is designed for use in switch-mode power supplies for DVDs, LCD monitors, set-top boxes, games consoles, adaptors, and general ac-dc converters.

Combining a current-mode PWM controller with a high-voltage MDMesh power MOSFET in a single package, the VIPer53 features self-protection mechanisms. The product's overload and short circuit faults are controlled by feedback monitoring and a delayed device reset, and a high-gain error amplifier provides protection via primary regulation against secondary loop failures. An over-temperature protection is also included.

Other features include switching frequencies of up to 300kHz, a trimmed voltage reference, and current limitation. The current-mode control offers adjustable limitation, soft-start, and shutdown control. Available in DIP8 or PowerSO-10 packages, the product can operate without heatsinks.

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