STMicroelectronics has introduced an offline primary power switch for use in applications such as switch-mode power supplies for DVDs, LCD monitors, set-top boxes, games consoles, adaptors and general AC-DC converters. The VIPer53 combines an enhanced current-mode PWM controller with a high-voltage MDMesh power MOSFET in a single package.
The part has an efficient standby mode, enabled by enhanced pulse skipping, that will help power-supply makers meet increasingly stringent environmental regulations such as those of the Energy Star Program.
The VIPer53 also has a number of self-protection mechanisms. Overload and short-circuit faults are controlled by feedback monitoring and a delayed device reset. A high-gain error amplifier provides protection via primary regulation against secondary loop failures. Over-temperature protection is built in, removing the need for an external thermal sensor.
Other features include a switching frequency of up to 300 kHz, a trimmed voltage reference and current limitation. A current-mode control offers adjustable limitation, soft-start and shutdown control. There is also an auxiliary under-voltage lockout system with hysteresis. And the part can act as a high-voltage start-up current source, reducing the need for external components.
The part is available in two packages, DIP8 or PowerSO-10, which can be run without heatsinks. The DIP8 version offers a 50 W output at European voltage ranges from 195-265 V a.c. Used with US and wider-ranging voltages of 85-265 V a.c., the output is 30 W. In the PowerSO-10 package the figures are 65 and 40 W, respectively.
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