VIPER28HDTR - 800V Off-Line High Voltage Converter | STMicroelectronics
MPN: VIPER28HDTR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.87 | $435.00 |
| 1,000 | $0.79 | $790.00 |
VIPER28HDTR Overview
An off-line high-voltage converter is a type of switched-mode power supply (SMPS) IC that directly rectifies and regulates AC mains voltage to a lower DC output. It integrates the power switch, control logic, and protection circuits into a single package, simplifying the design of compact power adapters, chargers, and auxiliary power supplies. The VIPER28HDTR belongs to the VIPER28 family of off-line converters, which are part of STMicroelectronics' VIPER series of AC-DC converter ICs, positioned within the broader power management IC category.
Key features include a 60kHz fixed switching frequency, a built-in 800V avalanche-rugged Power MOSFET, and a standby power consumption of less than 50mW at no load. The device also offers a wide input voltage range of 85VAC to 265VAC, making it suitable for global applications. Its integrated protections include overcurrent protection (OCP), overvoltage protection (OVP), and thermal shutdown, ensuring reliable operation in harsh environments.
The VIPER28HDTR uses a current-mode control architecture with a built-in error amplifier and a 1.2V reference voltage, enabling precise output regulation. The device's high-voltage startup circuit allows direct connection to the rectified mains, eliminating the need for an external startup resistor. Its burst-mode operation at light loads reduces switching losses, improving efficiency across the load range.
Typical applications include auxiliary power supplies for home appliances, smart meters, LED lighting drivers, and industrial control systems. The device's wide input range and low standby power make it ideal for always-on applications where energy efficiency is critical.
When designing with the VIPER28HDTR, ensure proper PCB layout with a solid ground plane and adequate creepage distances for high-voltage isolation. The thermal pad should be connected to a large copper area for heat dissipation, and the feedback loop should be compensated for stable operation across the full load range.
Drop-in alternatives for VIPER28HDTR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
VIPER28LDTR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
VIPER38HDTR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
VIPER26HDTR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
VIPER28HDTR Maximum Ratings & Electrical Characteristics
| Output Power (Buck) | 8 W |
| Output Power (Flyback) | 5 W |
| Input Voltage Range | 85 VAC to 265 VAC |
| Switching Frequency | 60 kHz |
| Breakdown Voltage | 800 V |
| Standby Power | < 50 mW |
| Operating Temperature | -40C to +150C |
| Package | SO-16N |
| Mounting Type | Surface Mount |
| Control Mode | Current Mode |
| Reference Voltage | 1.2 V |
| Overcurrent Protection | Yes |
| Overvoltage Protection | Yes |
| Thermal Shutdown | Yes |
| RoHS Status | Compliant |
VIPER28HDTR Pin Configuration
| Pin 1 | VDD — Power supply for the control logic |
| Pin 2 | GND — Ground |
| Pin 3 | FB — Feedback input for output regulation |
| Pin 4 | COMP — Compensation pin for the error amplifier |
| Pin 5 | DRAIN — Drain of the integrated Power MOSFET |
| Pin 6 | DRAIN — Drain of the integrated Power MOSFET |
| Pin 7 | DRAIN — Drain of the integrated Power MOSFET |
| Pin 8 | DRAIN — Drain of the integrated Power MOSFET |
| Pin 9 | SOURCE — Source of the integrated Power MOSFET |
| Pin 10 | SOURCE — Source of the integrated Power MOSFET |
| Pin 11 | SOURCE — Source of the integrated Power MOSFET |
| Pin 12 | SOURCE — Source of the integrated Power MOSFET |
| Pin 13 | NC — Not connected |
| Pin 14 | NC — Not connected |
| Pin 15 | NC — Not connected |
| Pin 16 | NC — Not connected |
Typical Applications
VIPER28HDTR is suitable for 6 applications: Auxiliary Power Supplies, LED Lighting Drivers, Smart Meters, Home Appliances, Industrial Control Systems, White Goods.
Auxiliary Power Supplies
The VIPER28HDTR provides a compact, efficient solution for auxiliary power supplies in home appliances, smart meters, and industrial control systems. Its integrated 800V MOSFET and current-mode control simplify design while delivering up to 8W. The wide input range (85-265VAC) ensures global compatibility, and low standby power (<50mW) meets energy efficiency regulations. In a typical auxiliary supply, the VIPER28HDTR is connected to the rectified mains, with a transformer providing isolation and a feedback optocoupler regulating the output. The device's burst-mode operation reduces switching losses at light load, improving overall efficiency. Designers must ensure proper transformer design and feedback compensation for stable operation across the load range.
Recommended
LED Lighting Drivers
The VIPER28HDTR is well-suited for LED lighting drivers, providing constant current or constant voltage output with high efficiency. Its 800V MOSFET handles high-voltage AC inputs, and the 60kHz fixed frequency simplifies EMI filter design. The device's low standby power is beneficial for always-on lighting applications. In a typical LED driver, the VIPER28HDTR is used in a flyback topology with a secondary-side constant current control. The integrated protections (OCP, OVP, thermal shutdown) ensure reliable operation. Designers should select the transformer turns ratio to achieve the desired output voltage and current, and ensure adequate thermal management for the SO-16N package.
Recommended
Smart Meters
The VIPER28HDTR is ideal for smart meter power supplies, offering high efficiency and low standby power. Its wide input range accommodates varying mains voltages, and the integrated protections ensure reliable operation in harsh environments. The device's compact SO-16N package saves board space in space-constrained meter designs. In a smart meter, the VIPER28HDTR provides a regulated DC rail for the metering IC and communication modules. The low standby power (<50mW) is critical for meeting energy efficiency standards. Designers should ensure proper isolation and surge protection for reliable operation over the meter's lifetime.
Recommended
Home Appliances
The VIPER28HDTR provides a cost-effective power solution for home appliances such as washing machines, refrigerators, and air conditioners. Its integrated 800V MOSFET and current-mode control simplify the power supply design, while the wide input range ensures compatibility with global mains voltages. The device's low standby power helps appliances meet energy efficiency regulations. In a typical appliance, the VIPER28HDTR powers the control board and user interface. The device's burst-mode operation reduces power consumption during standby, which is a key requirement for modern appliances. Designers should ensure adequate thermal management and proper PCB layout for high-voltage isolation.
Recommended
Industrial Control Systems
The VIPER28HDTR is suitable for industrial control systems requiring reliable, isolated power supplies. Its wide input range and integrated protections make it robust for industrial environments. The device's 800V MOSFET provides high voltage margin, and the 60kHz fixed frequency simplifies EMI compliance. In an industrial control system, the VIPER28HDTR powers sensors, actuators, and communication interfaces. The device's thermal shutdown and overcurrent protection ensure safe operation under fault conditions. Designers should consider derating for high ambient temperatures and ensure proper isolation for safety.
Recommended
White Goods
The VIPER28HDTR is used in white goods such as dishwashers, ovens, and microwave ovens, providing a reliable power supply for control electronics. Its low standby power and high efficiency contribute to energy savings. The device's compact package and integrated protections simplify design and enhance reliability. In a white good, the VIPER28HDTR powers the main control board, display, and user interface. The device's burst-mode operation reduces power consumption during standby, which is a key requirement for modern appliances. Designers should ensure proper thermal management and PCB layout for high-voltage isolation.
Recommended
Recommended Products Summary
Engineering reference data for VIPER28HDTR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | VIPER28LDTR | VIPER38HDTR | VIPER26HDTR |
|---|---|---|---|---|
| Package | SO-16N | SO-16N | SO-16N | SO-16N |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Power (Buck) | 8 W | 5 W | 12 W | 5 W |
| Output Power (Flyback) | 5 W | 3 W | 8 W | 3 W |
| Breakdown Voltage | 800 V | 800 V | 800 V | 800 V |
| Switching Frequency | 60 kHz | 60 kHz | 60 kHz | 60 kHz |
| Standby Power | < 50 mW | < 50 mW | < 50 mW | < 50 mW |
| Input Voltage Range | 85-265 VAC | 85-265 VAC | 85-265 VAC | 85-265 VAC |
Key Differentiators
- Higher output power than VIPER28LDTR (vs VIPER28LDTR)
- Lower output power than VIPER38HDTR (vs VIPER38HDTR)
- Same package and pinout as VIPER26HDTR (vs VIPER26HDTR)
Design Notes
For high-voltage off-line converters, maintain adequate creepage and clearance distances between primary and secondary sides. Use a solid ground plane and place the VIPER28HDTR close to the input rectifier to minimize loop area. The SO-16N package has multiple DRAIN and SOURCE pins that should be connected together with wide traces to handle high currents and improve thermal performance.
The VIPER28HDTR can dissipate significant power at full load. Ensure the SO-16N package is soldered to a large copper area on the PCB to act as a heatsink. For 8W output, the power dissipation is typically 1-2W, requiring a copper area of at least 1 square inch. In high ambient temperature environments, consider derating the output power or adding a heatsink.
Do not exceed the absolute maximum ratings, especially the drain-source voltage (800V) and junction temperature (150C). Ensure the feedback loop is properly compensated to avoid instability. Use a snubber circuit across the transformer primary to suppress voltage spikes. Also, verify that the transformer design matches the required output power and isolation specifications.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified.
