Overview
The VIPER28HE, produced by STMicroelectronics, is a high-voltage converter that integrates an 800 V avalanche-rugged power MOSFET with PWM current-mode control. This IC is designed to meet stringent energy-saving standards, featuring very low consumption and operation in burst mode under light load conditions. It includes an adjustable extra power timer (EPT) to sustain overload conditions for a few seconds and offers high-level protections such as dual-level overcurrent protection (OCP), output overvoltage protection, short-circuit protection, and thermal shutdown with hysteresis. The device automatically restarts after the removal of a fault condition, enhancing system reliability and IC lifetime.
Key Specifications
| Parameter | Value |
|---|---|
| Transistor Breakdown Voltage (V) | 800 V (min) |
| Drain Current (A) | 0.8 A (nom) |
| RDS(on) (Ω) | 7 Ω (max) at 25 °C |
| No-load Consumption | 30 mW at 230 VAC |
| Operating Frequencies | 60 kHz (L type) or 115 kHz (H type) |
| Package | 10-SDIP, SO-16, PDIP 7 |
| RoHS Compliance Grade | Ecopack2 |
Key Features
- 800 V avalanche-rugged power MOSFET for ultra-wide input voltage range
- Embedded HV startup and sense FET for minimal component usage
- PWM current-mode controller with adjustable current limit setpoint
- Dual-level OCP (IDlim and IDMAX) for protection against transformer saturation and short-circuit of the secondary diode
- 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 condition removal
- Thermal shutdown with hysteresis for system reliability
- Jittered frequency to reduce EMI
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 breakdown voltage of the VIPER28HE MOSFET?
The breakdown voltage of the VIPER28HE MOSFET is 800 V (min).
- What are the operating frequencies of the VIPER28HE?
The VIPER28HE operates at two frequencies: 60 kHz (L type) or 115 kHz (H type).
- What is the no-load consumption of the VIPER28HE at 230 VAC?
The no-load consumption is 30 mW at 230 VAC.
- Does the VIPER28HE have built-in protection features?
Yes, it includes dual-level OCP, output overvoltage protection, short-circuit protection, and thermal shutdown with hysteresis.
- How does the VIPER28HE handle fault conditions?
The device automatically restarts after the removal of a fault condition.
- What is the purpose of the extra power timer (EPT) in the VIPER28HE?
The EPT allows the IC to sustain overload conditions for a few seconds.
- What are the package options for the VIPER28HE?
The package options include 10-SDIP, SO-16, and PDIP 7.
- Is the VIPER28HE RoHS compliant?
Yes, it is RoHS compliant with an Ecopack2 grade.
- What is the typical application topology of the VIPER28HE?
The typical application topology is a flyback converter.
- How does the VIPER28HE reduce EMI?
The device uses a jittered frequency to reduce EMI.
