Overview
The VIPER27LD, produced by STMicroelectronics, is an off-line converter IC designed for high-voltage applications. It features an 800 V rugged power section, PWM control, and multiple protection mechanisms including over-current, overvoltage, and hysteretic thermal protection. The device also includes soft-start, safe auto-restart after fault conditions, and burst mode operation to meet standby energy saving regulations. The integrated high voltage start-up circuit and brown-out function enhance its reliability and efficiency in various power supply applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Drain-to-source (ground) voltage (VDRAIN) | 800 | V |
| Repetitive avalanche energy (EAV) | 5 | mJ |
| Pulse drain current (IDRAIN) | 3 | A |
| Operating frequency | 60 kHz (L type), 115 kHz (H type) | kHz |
| Standby power | < 50 mW at 265 Vac | mW |
| Drain-source on-state resistance (RDS(on)) | 7 Ω (at 25 °C) | Ω |
| Operating junction temperature range | -40 to 150 | °C |
| Storage temperature | -55 to 150 | °C |
| Maximum power dissipation | 1 W (DIP-7), 1.5 W (SO16N) | W |
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
- Safe auto-restart after a fault condition
- Hysteretic thermal shutdown
- Burst mode operation for energy saving
- Brown-out function for input voltage protection
- Integrated high voltage start-up circuit
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 VIPER27LD?
The maximum drain-to-source voltage is 800 V.
- What are the operating frequencies of the VIPER27LD?
The operating frequencies are 60 kHz for the L type and 115 kHz for the H type.
- What is the standby power consumption of the VIPER27LD at 265 Vac?
The standby power consumption is less than 50 mW at 265 Vac.
- Does the VIPER27LD have overvoltage protection?
Yes, it has adjustable and accurate overvoltage protection.
- What is the purpose of the brown-out function in the VIPER27LD?
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 VIPER27LD manage thermal protection?
The device features hysteretic thermal shutdown for thermal protection.
- What is the role of the high voltage start-up circuit in the VIPER27LD?
The high voltage start-up circuit is embedded in the device to ensure proper start-up even at high input voltages.
- Can the current limit set point be adjusted in the VIPER27LD?
Yes, the current limit set point can be adjusted using the CONT pin.
- What is the significance of burst mode operation in the VIPER27LD?
Burst mode operation helps in meeting standby energy saving regulations by reducing power consumption during standby.
- What types of packages are available for the VIPER27LD?
The VIPER27LD is available in SO-16 and PDIP 7 packages.
