Overview
The VIPER25LN, produced by STMicroelectronics, is an off-line high voltage converter IC designed for a wide range of power supply applications. It features an 800 V rugged power section with a PWM control, making it suitable for high-voltage and high-reliability requirements. The device includes multiple protection mechanisms such as overcurrent, overvoltage, and thermal protection, along with a soft-start and auto-restart function to ensure safe and efficient operation. The VIPER25LN is particularly useful in applications where energy efficiency and low standby power consumption are critical.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Drain-to-source voltage (VDRAIN) | 800 | V |
| Repetitive avalanche energy (EAV) | 5 | mJ |
| Repetitive avalanche current (IAR) | 1.5 | A |
| Pulse drain current (IDRAIN) | 3 | A |
| Operating supply current (IDD0) | 0.9 | mA |
| Operating supply current (IDD1) | 3.5 | mA |
| Operating junction temperature range (TJ) | -40 to 150 | °C |
| Storage temperature range (TSTG) | -55 to 150 | °C |
| Drain-source on-state resistance (RDS(on)) | 7 | Ω (at 25°C) |
| Internal frequency limit (FOSClim) | 122-150 kHz (VIPER25L), 200-250 kHz (VIPER25H) | kHz |
Key Features
- Quasi-resonant (QR) control: Valley switching operation for reduced EMI and improved efficiency.
- High voltage start-up circuit: Embedded high voltage switched start-up bias current.
- Overcurrent and overvoltage protection: Double levels of overcurrent protection and adjustable overvoltage protection.
- Thermal protection: Hysteretic thermal shutdown to prevent overheating.
- Soft-start and auto-restart: Safe start-up and restart after fault conditions.
- Burst mode operation: Low power consumption in standby mode to meet energy-saving regulations.
- Current-mode PWM control: With zero current detection (ZCD) circuit for QR operation.
- Low EMI emission: Due to quasi-resonant operation and valley-skipping mode.
Applications
- Adapters for portable devices: PDA, camcorders, shavers, cellular phones, cordless phones, videogames.
- Auxiliary power supply: For LCD/PDP TVs, monitors, audio systems, computers, industrial systems, LED drivers.
- SMPS for consumer electronics: Set-top boxes, DVD players and recorders, white goods.
- Utility power meters: And other industrial power supply applications.
Q & A
- What is the maximum drain-to-source voltage of the VIPER25LN?
The maximum drain-to-source voltage (VDRAIN) is 800 V.
- What type of control does the VIPER25LN use?
The VIPER25LN uses quasi-resonant (QR) control with current-mode PWM logic.
- What are the key protection features of the VIPER25LN?
The key protection features include overcurrent, overvoltage, thermal protection, and auto-restart after fault conditions.
- How does the VIPER25LN manage standby power consumption?
The VIPER25LN uses burst mode operation to achieve low power consumption in standby mode.
- What is the typical operating supply current of the VIPER25LN?
The typical operating supply current (IDD1) is 3.5 mA when switching.
- What is the internal frequency limit of the VIPER25LN?
The internal frequency limit (FOSClim) is 122-150 kHz for VIPER25L and 200-250 kHz for VIPER25H.
- What is the purpose of the soft-start feature in the VIPER25LN?
The soft-start feature gradually increases the drain peak current from zero to the maximum value during start-up to prevent sudden spikes.
- How does the VIPER25LN handle thermal issues?
The VIPER25LN has hysteretic thermal shutdown to prevent overheating and ensure safe operation.
- What are some common applications of the VIPER25LN?
Common applications include adapters for portable devices, auxiliary power supplies for consumer electronics, and SMPS for set-top boxes and white goods.
- What is the storage temperature range of the VIPER25LN?
The storage temperature range (TSTG) is -55 to 150°C.
