STMicroelectronics VIPER012BHSTR

Overview

VIPER012BHSTR from STMicroelectronics is a high-voltage off-line PWM converter IC integrating an 800 V avalanche-rugged power MOSFET, current-mode PWM controller, and embedded HV startup circuit. It delivers up to 12 W in flyback topologies, supports self-supply operation (eliminating auxiliary winding), and achieves <10 mW no-load input power at 230 VAC - enabling compliance with stringent energy-saving standards for low-power SMPS in home appliances and lighting.

For engineers reviewing the VIPER012BHSTR datasheet, VIPER012BHSTR pinout, VIPER012BHSTR application, or VIPER012BHSTR equivalent, key selection criteria include its 120 kHz ±7% jittered switching frequency, 800 V drain-source breakdown, integrated OCP/OLP/VCC clamp protections, and SSOP10 package thermal performance with R_thJA = 90 °C/W on 100 mm² copper.

Technical Context

This IC implements current-mode PWM control with built-in soft-start, pulse-skipping at light load, and pulse-frequency modulation (PFM) to minimize standby consumption. The integrated 800 V MOSFET enables direct rectified mains connection across 85–265 VAC inputs without external snubber scaling.

It features dual supply modes: HV startup current source (ICH3 = 8.8 mA typ.) charges VCC during startup and steady-state self-supply; internal 1.2 V reference E/A supports direct or optocoupler-based feedback; and DIS pin enables programmable line/output overvoltage protection via voltage divider.

Key Specifications

Pinout & Package

The VIPER012BHSTR is housed in a 10-lead SSOP package with exposed drain pads (pins 6–10) for enhanced thermal dissipation. Copper area under these pins is mandatory to achieve specified R_thJA = 90 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage offline converter applications.

Compared with ICE2QS03G, VIPER012BHSTR enables wider input range and lower standby power; compared with VIPER06XS, it offers optimized efficiency and thermal performance at its 12 W target, with tighter current limit reducing MOSFET stress and heatsink requirements.

Availability

VIPER012BHSTR is available at Aetrix Electronics and suitable for smart lighting drivers, white goods auxiliary supplies, industrial sensor node PSUs, and LED tube ballasts requiring stable component supply across multi-year production cycles.

Supply support for VIPER012BHSTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

VIPER is ST's dedicated high-voltage offline AC-DC converter product line, engineered for low-power (<30 W) energy-efficient SMPS targeting ERP, Energy Star, and CoC compliance in cost-sensitive applications.

FAQ

What is the maximum continuous output power achievable with VIPER012BHSTR in a flyback topology?

The VIPER012BHSTR is rated for up to 12 W continuous output power in a properly designed flyback converter with adequate PCB copper area (100 mm²) and ambient temperature ≤50 °C. This assumes 85–265 VAC input, 5 V/2.4 A output, and efficiency ≥75%. Derating is required above 50 °C ambient or with reduced copper area due to its 1 W max power dissipation limit and thermal shutdown at 150–160 °C junction temperature.

Can VIPER012BHSTR operate without an auxiliary winding?

Yes - VIPER012BHSTR supports self-supply mode where the internal HV current source continuously charges the VCC capacitor from the DRAIN pin, eliminating the need for an auxiliary winding, bias diode, and capacitor. This mode is enabled by leaving the VCC capacitor connected only between pins 2 (VCC) and 1 (GND); no external bias source is required after initial startup.

How does the DIS pin implement overvoltage protection?

The DIS pin triggers automatic restart protection when voltage exceeds 1.2 V for more than 1 ms. For line OVP, a resistor divider from rectified mains to DIS sets the trip point (e.g., 400 V DC → 1.2 V at DIS). For output OVP in non-isolated topologies, a similar divider from output to DIS provides direct sensing. If unused, DIS must be soldered to GND to disable the function and prevent false triggering.

What is the purpose of the five DRAIN pins (6–10) in the SSOP10 package?

Pins 6–10 are internally bonded to the MOSFET die's metal pad and serve exclusively as the high-voltage drain connection. Their parallel configuration lowers effective bond wire inductance and distributes thermal load. A continuous copper pour under all five pins is mandatory to achieve the specified R_thJA = 90 °C/W; splitting or isolating these pads degrades thermal performance and risks thermal runaway.