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VIPER31: 3 Answers to New Engineering Challenges

STMVIPER31 is the first ST high-voltage converter to offer up to 18 watts in a fly-back topology with a universal input mains range (85–265 VAC). Despite a relatively recent launch, it is already in a popular metering system and multiple appliances. As a result, we expect to sell more than one million units in 2021. This positive response is due to its 800 volts avalanche rugged power MOSFET and advanced controller features. Indeed, thanks to its architecture, the VIPer31 is flexible, robust, and efficient. It was thus essential to understand what the new high-voltage converter means to engineers.

Meet the New Family

The VIPER line covers a wide range of applications, as we recently saw with the VIPER26K. The VIPERx1 family tailors to flyback topologies with both primary-side and secondary-side regulation as well as buck. Put simply, we traditionally find this device in switched-mode power supplies (SMPS) that do not have an optocoupler. The VIPER01 had an output power of 4 W, and the VIPER11 hovered around 8 W. The 18 W of the VIPer31 is thus a significant step forward. The new product also has a lower maximum RDS(on) of 3.5 Ω. Comparatively, the VIPER01 has an RDS(on) of 30 Ω while the VIPER11 sits at 15 Ω.

There are currently eight part numbers under the VIPer31 series, with more on the way. The VIPER317 has a drain current limit protection (IDLIM) of 710 mA. The VIPER318 has an IDLIM of 850 mA, and the VIPER319 reaches 990 mA. There are also X, L, and H variants for these versions. The X type has a jittered switching frequency (Fosc) of 30 kHz ± 7%. The L type has a Fosc of 60 kHz ± 7%, and the ones marked H are at 132 kHz ±7%. Choosing the right oscillator frequency (Fosc) allows engineers to select more cost-effective EMI filters and reduce their bill of materials.

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