STMicroelectronics VIPER122 High-Voltage Converter
Mains power converter ideal for use in flyback or buck topologies
STMicroelectronics’ VIPER122 is a high-voltage converter which implements PWM control and provides a regulated output via an avalanche-rugged power MOSFET which has a breakdown voltage of 730V. The VIPER122 is ideal for use in auxiliary switch-mode power supplies.
STMicroelectronics’ guidance suggests that the VIPER122 converter can supply a continuous load of 9W when operating from a 230V AC input in an enclosed, non-ventilated power adaptor, and 11W in an open-frame unit at an ambient temperature of 50°C. In the same conditions but operating across an input-voltage range of 85V-265V AC, the VIPER122 continuous power ratings are 5W for a power adaptor, and 6W for an open-frame design.
The VIPER122 high-voltage converter is intended for use in flyback or buck topologies. Specified with a current limit of 450mA, it supports a higher output current when operating in the buck topology than in the flyback.
The converter operates at a switching frequency of 60kHz, implementing jittering to reduce EMI and allow the use of a smaller filter. The VIPER122 is notable for its low power consumption and implements a burst mode which draws very low input power at no load. The converter also provides high efficiency at light loads.
The VIPER122 converter embeds high-voltage start-up and current-sense circuitry, reducing the number of external components required in the power circuit.
VIPER122 Features
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