Overview
The VIPER27HN, produced by STMicroelectronics, is a high-performance off-line converter IC designed for various power supply applications. It features an 800 V rugged power section with a PWM control, making it suitable for high-voltage and low-power AC-DC converters. The device includes multiple protection mechanisms such as over-current, overvoltage, and thermal protection, ensuring reliable operation under various conditions. The VIPER27HN also incorporates advanced features like frequency jittering for reduced EMI, burst mode operation for energy efficiency, and a soft-start function to prevent inrush currents during power-up.
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 (FOSC) | 103-115-127 kHz (for H type) | kHz |
| Standby power | < 50 mW at 265 Vac | mW |
| Thermal shutdown temperature (TSD) | 150-160 °C | °C |
| Thermal shutdown hysteresis (THYST) | 30 °C | °C |
| Package | SO16 narrow |
Key Features
- 800 V avalanche rugged power section
- PWM operation with frequency jittering for low EMI
- Operating frequencies: 60 kHz for L type, 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 and safe auto-restart after fault conditions
- Hysteretic thermal shutdown
- Burst mode operation for energy efficiency
- Brown-out protection with hysteresis
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, white goods
Q & A
- What is the maximum drain-to-source voltage of the VIPER27HN?
The maximum drain-to-source voltage (VDRAIN) is 800 V.
- What are the operating frequencies of the VIPER27HN?
The operating frequencies are 60 kHz for the L type and 103-115-127 kHz for the H type.
- What is the standby power consumption of the VIPER27HN?
The standby power consumption is less than 50 mW at 265 Vac.
- Does the VIPER27HN have adjustable overvoltage protection?
Yes, the VIPER27HN has adjustable and accurate overvoltage protection.
- What is the thermal shutdown temperature of the VIPER27HN?
The thermal shutdown temperature (TSD) is between 150-160 °C.
- Does the VIPER27HN support burst mode operation?
Yes, the VIPER27HN supports burst mode operation for energy efficiency.
- What is the purpose of the brown-out protection in the VIPER27HN?
The brown-out protection shuts down the device when the rectified input voltage level is below the normal minimum level specified for the system, with hysteresis to prevent oscillations.
- How does the VIPER27HN handle fault conditions?
The VIPER27HN has built-in fault protections with auto-restart mode, ensuring the device restarts after any fault condition removal with a very low repetition rate to prevent overheating.
- What package options are available for the VIPER27HN?
The VIPER27HN is available in SO16 narrow packages.
- What is the role of the soft-start function in the VIPER27HN?
The soft-start function prevents inrush currents during power-up, ensuring a smooth start-up process.
