Overview
The VIPER28HN, produced by 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, featuring very low consumption and burst mode operation under light load conditions. The device includes an adjustable extra power timer (EPT) to sustain overload conditions for a few seconds and incorporates high-level protections such as dual-level overcurrent protection, output overvoltage protection, short-circuit protection, and thermal shutdown with hysteresis. After a fault condition, the IC automatically restarts, enhancing system reliability and IC lifetime.
Key Specifications
| Specification | Value |
|---|---|
| Voltage Rating (BVDSS) | 800 V min. |
| Drain-Source On-State Resistance (RDS(on)) | 7 Ω at 25 °C |
| Operating Frequencies | 60 kHz (L type) or 115 kHz (H type) |
| No-Load Consumption | 30 mW at 230 VAC |
| Package Types | SO-16, PDIP 7 |
| Grade | Industrial |
| RoHS Compliance Grade | Ecopack2 |
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 overcurrent protection (OCP) with selectable threshold
- Output overvoltage protection with tight tolerance and digital noise filter
- Soft-start to reduce stress during startup and increase IC lifetime
- Automatic restart after a fault condition
- Thermal shutdown with hysteresis to increase system reliability
- Jittered frequency to reduce EMI
- Extra power timer (EPT) to sustain overload conditions for a few seconds
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 voltage rating of the VIPER28HN?
The VIPER28HN has a voltage rating of 800 V min.
- What are the operating frequencies of the VIPER28HN?
The operating frequencies are 60 kHz (L type) or 115 kHz (H type).
- What is the no-load consumption of the VIPER28HN at 230 VAC?
The no-load consumption is 30 mW at 230 VAC.
- What types of packages are available for the VIPER28HN?
The VIPER28HN is available in SO-16 and PDIP 7 packages.
- Does the VIPER28HN have built-in overcurrent protection?
Yes, it has dual-level overcurrent protection (OCP) with selectable threshold.
- How does the VIPER28HN handle thermal issues?
The device features thermal shutdown with hysteresis to increase system reliability and IC lifetime.
- What is the purpose of the extra power timer (EPT) in the VIPER28HN?
The EPT allows the IC to sustain overload conditions for a few seconds.
- Does the VIPER28HN support automatic restart after a fault condition?
Yes, the IC automatically restarts after a fault condition.
- What is the significance of the soft-start feature in the VIPER28HN?
The soft-start feature reduces the stress during startup and increases IC lifetime.
- How does the VIPER28HN reduce EMI?
The device uses a jittered frequency to reduce EMI.
