VIPER35LD

Overview

The VIPER35LD is a high voltage converter from the VIPerPlus family, integrating an 800 V avalanche-rugged power MOSFET with a quasi-resonant current mode PWM controller. It operates in flyback topology with a switching frequency limit of 136 kHz. The device supports an input supply voltage range of 8.5 V to 23.5 V and delivers up to 22 W output power. It features embedded HV start-up, senseFET, and low consumption of less than 30 mW at 230 V AC no-load. The component is housed in an SIOC-16 Narrow package.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET for wide input voltage range support
• Employs quasi-resonant operation to reduce EMI levels and improve conversion efficiency
• Includes multifunction ZCD pin for zero-current detection and overcurrent threshold setup
• Provides automatic restart protection against output overvoltage, short-circuit, and thermal faults

Applications

• Adapters and chargers for mobile phones and tablets
• Telecommunication equipment power supplies
• LCD/LED TV adapters
• Computer and monitor external power supplies

Procurement Notes

Verify the specific suffix 'LD' corresponds to the required packaging format, as datasheets indicate tube packaging for this variant while other suffixes may use tape and reel. Confirm the L-type designation aligns with the 136 kHz frequency requirement. Ensure the SIOC-16 Narrow package dimensions match the PCB layout constraints. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Selection Notes

Select the VIPER35LD when designing isolated flyback converters requiring low standby power consumption and robust protection features. The L-type frequency limit of 136 kHz suits applications where EMI filtering needs to be balanced with component count. Choose this model over H-type variants if lower switching frequencies are preferred for reduced magnetic component size. Verify that the 22 W power capability meets the system load requirements.

Part Context

The VIPER35LD belongs to the VIPerPlus family of high-voltage converters from STMicroelectronics. This series is designed for offline applications, combining a rugged power MOSFET with advanced control logic. The family emphasizes energy saving standards compliance through burst mode operation under light loads. Other members include VIPER35HD and VIPER35E, differing primarily in switching frequency limits and packaging options.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.