Overview
The VIPER27HDTR, produced by STMicroelectronics, is an off-line converter designed for high-voltage applications. It features an 800 V rugged power section, PWM control, and comprehensive protection mechanisms including over-current, overvoltage, and overload protections. The device also includes hysteretic thermal shutdown, soft-start, and safe auto-restart after fault condition removal. The VIPER27HDTR is optimized for low standby power consumption, making it compliant with energy-saving regulations such as ENERGY STAR and Blue Angel standards.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Drain-to-source (ground) voltage (VDRAIN) | 800 | V |
| Repetitive avalanche energy (EAV) | 5 | mJ |
| Repetitive avalanche current (IAR) | 1.5 | A |
| Pulse drain current (IDRAIN) | 3 | A |
| Operating frequency (VIPER27L/VIPER27H) | 60 kHz / 115 kHz | kHz |
| Standby power at 265 Vac | < 50 mW | mW |
| Drain-source on-state resistance (RDS(on)) at 25°C | 7 Ω | Ω |
| Thermal shutdown temperature (TSD) | 150 - 160 °C | °C |
| Storage temperature (TSTG) | -55 to 150 °C | °C |
Key Features
- 800 V avalanche rugged power section
- PWM operation with frequency jittering for low EMI
- Operating frequencies: 60 kHz for L type and 115 kHz for H type
- Standby power < 50 mW at 265 Vac
- Limiting current with adjustable set point
- Adjustable and accurate overvoltage protection
- On-board soft-start
- Safe auto-restart after a fault condition
- Hysteretic thermal shutdown
- Brown-out function with hysteresis
- Burst mode operation for high performance in standby mode
Applications
- Auxiliary power supply for consumer and home equipment
- ATX auxiliary power supply
- Low to medium power AC-DC adapters
- SMPS for set-top boxes, DVD players, and recorders
- SMPS for white goods
Q & A
- What is the maximum drain-to-source voltage of the VIPER27HDTR?
The maximum drain-to-source voltage is 800 V.
- What are the operating frequencies for the VIPER27L and VIPER27H types?
The VIPER27L operates at 60 kHz, and the VIPER27H operates at 115 kHz.
- What is the standby power consumption at 265 Vac?
The standby power consumption is less than 50 mW.
- Does the VIPER27HDTR have adjustable overvoltage protection?
- What is the purpose of the brown-out function?
The brown-out function protects the switch mode power supply when the rectified input voltage level is below the normal minimum level specified for the system.
- How does the device handle thermal protection?
The device features hysteretic thermal shutdown to protect against overheating.
- What is the role of the soft-start feature?
The soft-start feature ensures a controlled startup of the device to prevent inrush currents.
- Does the VIPER27HDTR support burst mode operation?
- What are some common applications of the VIPER27HDTR?
- How does the VIPER27HDTR comply with energy-saving regulations?
The device is designed to meet standby energy saving regulations with very low power consumption and compliance with standards like ENERGY STAR and Blue Angel.
