Overview
The VIPER28LN, 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 device 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 high-level protections such as dual-level overcurrent protection (OCP), output overvoltage, short-circuit, and thermal shutdown with hysteresis. The IC automatically restarts after the removal of a fault condition.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Transistor Breakdown Voltage (V) | 800 | V |
| Drain Current (A) | 0.8 | A |
| RDS(on) (Ω) | 7 | Ω |
| Input Voltage AC (Min/Max) | 85 / 265 | V |
| No-load Consumption at 230 V AC | 30 mW | mW |
| Operating Frequencies | 60 kHz (L type) or 115 kHz (H type) | kHz |
| Package | PDIP 7 | - |
| RoHS Compliance Grade | Ecopack2 | - |
| Operating Temperature (°C) (Min/Max) | -25 to 125 | °C |
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 V AC)
- 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 a fault condition
- 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 maximum breakdown voltage of the VIPER28LN MOSFET?
The maximum breakdown voltage of the VIPER28LN MOSFET is 800 V.
- What are the operating frequencies of the VIPER28LN?
The VIPER28LN operates at two frequencies: 60 kHz (L type) or 115 kHz (H type).
- What is the no-load consumption of the VIPER28LN at 230 V AC?
The no-load consumption of the VIPER28LN at 230 V AC is 30 mW.
- What kind of protection does the VIPER28LN offer against overcurrent conditions?
The VIPER28LN offers dual-level overcurrent protection (OCP) with selectable threshold (IDlim) and a second OCP with a higher value (IDMAX).
- How does the VIPER28LN manage overload conditions?
The VIPER28LN features an adjustable extra power timer (EPT) that blanks the overload current for a few seconds.
- What is the purpose of the soft-start feature in the VIPER28LN?
The soft-start feature reduces the stress during startup and increases the IC lifetime by progressively increasing the drain current limitation to the maximum value.
- How does the VIPER28LN protect against thermal issues?
The VIPER28LN includes thermal shutdown with hysteresis to increase system reliability and IC lifetime.
- What happens after a fault condition is removed in the VIPER28LN?
After the removal of a fault condition, the IC is automatically restarted.
- What is the package type of the VIPER28LN?
The VIPER28LN is available in a PDIP 7 package.
- Is the VIPER28LN RoHS compliant?
Yes, the VIPER28LN is RoHS compliant with an Ecopack2 grade.
