VIPER26HD

Overview

The VIPER26HD is an offline high-voltage converter from the VIPerPlus family, designed for flyback topologies. It integrates an 800 V avalanche-rugged power section with a PWM controller operating at a fixed frequency of 115 kHz. The device supports an input voltage range of 11.5 V to 23.5 V and delivers up to 20 W of output power. Key electrical parameters include a maximum current limit of 0.74 A, a startup voltage of 13 V, and a maximum duty cycle of 80%. It operates within a temperature range of -40 °C to +150 °C TJ.

Feature Summary

• Integrates an 800 V avalanche-rugged power section for robust operation in high-voltage environments.
• Features advanced frequency jittering to reduce electromagnetic interference (EMI) filter costs.
• Includes built-in protection mechanisms such as hysteretic thermal shutdown and safe auto-restart after fault conditions.

Applications

• Smart meter and power line communication systems
• General-purpose AC/DC power supplies
• Offline converters requiring low standby power

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm package type and tape/reel specifications. Ensure the component meets RoHS compliance requirements for your target market. Confirm that the 115 kHz switching frequency aligns with your transformer design constraints. Validate that the 800 V breakdown rating is sufficient for your circuit's peak voltage stresses.

Selection Notes

Select this component when designing flyback converters requiring high voltage isolation and integrated protection. The 115 kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 0.74 A current limit when sizing output transformers. Verify compatibility with the SO-16 narrow package dimensions for PCB layout optimization.

Part Context

The VIPER26HD belongs to the VIPerPlus series, which combines high-voltage MOSFET technology with intelligent control logic. This series targets cost-sensitive applications where efficiency and reliability are critical. The H-type designation indicates the 115 kHz operating frequency variant, distinguishing it from the L-type 60 kHz version.

Replacement Considerations

The VIPER26LDTR is a parameter-equivalent alternative within the same family, differing primarily in switching frequency (60 kHz vs. 115 kHz). Designers must adjust transformer specifications when substituting between these variants due to the frequency difference.