Overview
The VIPER28HD, part of the VIPerPlus family from STMicroelectronics, is a high-voltage converter that integrates an 800 V rugged power MOSFET with PWM current-mode control. This IC is designed to meet stringent energy-saving standards with very low consumption and operates in burst mode under light load conditions. It features an adjustable extra power timer (EPT) to sustain overload conditions for a few seconds and includes integrated HV startup, sense FET, and an oscillator with jitter, allowing for minimal component usage in applications. The device also includes high-level protections such as dual-level overcurrent protection (OCP), output overvoltage protection, short-circuit protection, and thermal shutdown with hysteresis, ensuring automatic restart after fault conditions are removed.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | VIPER28HD |
| Marketing Status | Active |
| Package | SO-16 |
| Grade | Industrial |
| RoHS Compliance Grade | Ecopack2 |
| Transistor Breakdown Voltage (V) (min) | 800 |
| Drain Current (A) (nom) | 0.8 |
| RDS(on) (Ω) (max) | 7 |
| Operating Frequency | 60 kHz (L type) or 115 kHz (H type) |
| No-load Consumption at 230 VAC | 30 mW |
| Operating Temperature (°C) | -25 to 125 |
Key Features
- 800 V avalanche-rugged power MOSFET for ultra-wide input voltage range
- Embedded HV startup and sense FET
- PWM current-mode controller
- Dual-level OCP (IDlim and IDMAX) for protection against transformer saturation or short-circuit of the secondary diode
- Low no-load consumption (30 mW at 230 VAC)
- Two operating frequencies: 60 kHz (L type) or 115 kHz (H type)
- Jittered frequency to reduce EMI
- Extra power timer (EPT) to manage overload conditions
- Output overvoltage protection with tight tolerance and digital noise filter
- Soft-start to reduce stress during startup and increase IC lifetime
- Automatic restart after fault conditions
- Thermal shutdown with hysteresis to increase system reliability and IC lifetime
Applications
- Auxiliary power supply for consumer and home equipment
- Power supply for energy meters and data concentrators
- AC-DC adapters
Q & A
- What is the VIPER28HD?
The VIPER28HD is a high-voltage converter from STMicroelectronics that integrates an 800 V rugged power MOSFET with PWM current-mode control.
- What are the key features of the VIPER28HD?
Key features include an 800 V avalanche-rugged power MOSFET, embedded HV startup and sense FET, PWM current-mode controller, dual-level OCP, low no-load consumption, and various protection mechanisms like output overvoltage and thermal shutdown.
- What are the operating frequencies of the VIPER28HD?
The device operates at two frequencies: 60 kHz (L type) or 115 kHz (H type).
- How does the VIPER28HD manage overload conditions?
The device features an adjustable extra power timer (EPT) that blanks the overload current for a few seconds.
- What kind of protections does the VIPER28HD have?
The device includes dual-level OCP, output overvoltage protection, short-circuit protection, and thermal shutdown with hysteresis.
- How does the VIPER28HD restart after a fault condition?
After a fault condition, the IC is automatically restarted once the fault is removed and the necessary conditions are met.
- What is the typical no-load consumption of the VIPER28HD?
The no-load consumption is 30 mW at 230 VAC.
- What are the common applications of the VIPER28HD?
Common applications include auxiliary power supplies for consumer and home equipment, power supplies for energy meters and data concentrators, and AC-DC adapters.
- What is the operating temperature range of the VIPER28HD?
The operating temperature range is -25 to 125 °C.
- How does the VIPER28HD reduce EMI?
The device uses a jittered frequency to reduce EMI.
