STMicroelectronics has introduced its VIPer17 off-line, switched-mode converter that integrates an 800 V avalanche-rugged MOSFET as well as numerous features to save external components and ensure efficient operation during standby mode. Constant-current operation with an adjustable set point enables use with all primary line voltages in SMPS (Switched-Mode Power Supply) designs up to 12 W.

By integrating a high-voltage startup-current generator as well as essential protection functions, VIPer17 eliminates the need for external sensing components, including a startup resistor. Protection features include adjustable over-voltage and overload protection, over-temperature protection, and two levels of over-current protection.

Detection of a fault initiates the device's auto-restart function that prevents damage to the power supply or the load. An integrated soft-start function, active at startup or after a fault, reduces stress on the secondary diode and also helps prevent transformer saturation.

Under light-load conditions that occur when the powered equipment is placed in standby mode, the VIPer17 automatically enters burst mode to maximize efficiency. By achieving high efficiency at sub-1 W loads, VIPer17 helps designers reduce system standby power and average power consumption to satisfy energy-saving initiatives such as Energy Star and Blue Angel. The device's typical standby power consumption is 50 mW, but this can be reduced to 30 mW when used in an optimized transformer design.

The switched-mode converter can be supplied in a low-cost, 7-pin, through-hole DIP package (N type) or in a surface-mounting SMD package (D type).

The device is available at $0.37 in quantities of 10,000.

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