Overview
The VIPER25HN, produced by STMicroelectronics, is an off-line converter IC that belongs to the VIPerPlus family. It features an 800 V rugged power section, PWM control, and various protection mechanisms such as double levels of overcurrent protection, overvoltage and overload protections, and hysteretic thermal shutdown. The device also includes a soft-start function and safe auto-restart after any fault condition removal. The quasi-resonant control allows for valley switching operation, reducing EMI filter costs. Additionally, the device operates in burst mode, helping to meet standby energy saving regulations and protecting the switch mode power supply with brownout and brown-in functions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Isolation | Isolated | |
| Frequency Range | 200 ~ 250 kHz | |
| Voltage - Input | 8.5 ~ 23.5 V | V |
| Voltage - Output | 800 V | V |
| Power (watts) | 24 W | W |
| Operating Temperature | -40°C ~ 150°C | °C |
| Package / Case | 8-DIP (0.300", 7.62mm), 7 Leads | |
| Switching Frequency | 225 kHz | kHz |
| Mounting Style | Through Hole | |
| Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
Key Features
- 800 V avalanche rugged power section
- Quasi-resonant (QR) control for valley switching operation
- 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
- Brownout and brown-in function
- High voltage start-up circuit embedded in the device
Applications
- Adapters for PDA, camcorders, shavers, cellular phones, cordless phones, videogames
- Auxiliary power supply for LCD/PDP TV, monitors, audio systems, computer, industrial systems, LED driver, No el-cap LED driver, utility power meter
- SMPS for set-top boxes, DVD players and recorders, white goods
Q & A
- What is the VIPER25HN's output voltage rating?
The VIPER25HN has an output voltage rating of 800 V.
- What is the frequency range of the VIPER25HN?
The frequency range of the VIPER25HN is 200 ~ 250 kHz.
- What are the input voltage ranges for the VIPER25HN?
The input voltage range for the VIPER25HN is 8.5 ~ 23.5 V.
- What is the power rating of the VIPER25HN?
The power rating of the VIPER25HN is 24 W.
- What type of protection mechanisms does the VIPER25HN have?
The VIPER25HN includes double levels of overcurrent protection, overvoltage and overload protections, hysteretic thermal shutdown, and safe auto-restart after any fault condition removal.
- Does the VIPER25HN support burst mode operation?
- What is the purpose of the quasi-resonant control in the VIPER25HN?
The quasi-resonant control allows for valley switching operation, which reduces EMI filter costs.
- What is the operating temperature range of the VIPER25HN?
The operating temperature range of the VIPER25HN is -40°C ~ 150°C.
- Is the VIPER25HN RoHS compliant?
- What are some common applications of the VIPER25HN?
The VIPER25HN is used in adapters, auxiliary power supplies for various electronic devices, and SMPS for set-top boxes, DVD players, and other consumer electronics.
