STMicroelectronics VIPER012HS

Overview

VIPER012HS from STMicroelectronics is an off-line high-voltage AC-DC converter IC integrating an 800 V avalanche-rugged N-channel power MOSFET, current-mode PWM controller, embedded HV startup circuit, and sense-FET. It delivers up to 4 W in open-frame designs at 50 °C ambient, supports 85–265 VAC input, operates at 60 kHz ±7% (type L), and achieves <10 mW no-load power consumption at 230 VAC - enabling energy-compliant low-power SMPS for home appliances and lighting.

For engineers reviewing the VIPER012HS datasheet, VIPER012HS pinout, VIPER012HS application, or VIPER012HS equivalent, key selection criteria include its self-supply capability (eliminating auxiliary winding), integrated OCP/OLP/VCC clamp protections with auto-restart, jittered oscillator for EMI reduction, and SSOP10 package with five DRAIN pins for thermal management.

Technical Context

The VIPER012HS implements a fixed-frequency current-mode PWM controller with built-in jitter (±7% at 260 Hz) to spread spectral energy and reduce conducted EMI filter size. Its internal transconductance error amplifier features a 1.2 V reference and supports both primary-side regulation (via FB voltage divider to VCC) and secondary-side feedback (via optocoupler driving COMP).

It integrates a high-voltage startup current source (ICH3 = 7.6–10 mA typ. in self-supply mode) that activates when VCC drops to 4.25 V, enabling single-capacitor biasing. Protection logic includes pulse-skip to prevent flux-runaway, thermal shutdown at 150–160 °C, and overload delay (tOVL_MAX = 200 ms typ. for type L) before auto-restart.

Key Specifications

Pinout & Package

Package: SSOP10 (3.9 mm × 4.9 mm, 0.65 mm pitch), thermally enhanced with five DRAIN pins connected to internal MOSFET metal pad for low R_TH-JA (95 °C/W with 100 mm² copper).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QS03G and LNK364PG, VIPER012HS offers superior integration (HV startup, self-supply, jitter), higher 800 V drain rating for universal input robustness, and a dedicated DIS pin enabling precise overvoltage response - making it optimal for compact, low-EMI, high-reliability designs where BOM count and thermal management are critical.

Availability

VIPER012HS is available at Aetrix Electronics and suitable for home appliance power supplies, LED lighting drivers, industrial sensor node PSUs, and smart thermostat power modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for VIPER012HS 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 microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

VIPER012HS belongs to the VIPer™ energy-saving off-line high-voltage converter product line, engineered specifically for ultra-low standby power, minimal external component count, and robust operation in universal-input AC-DC applications up to 8 W.

FAQ

What is the maximum continuous output power achievable with VIPER012HS in an open-frame design?

VIPER012HS delivers up to 4.5 W continuous output power in open-frame configurations at 50 °C ambient temperature with adequate heatsinking, as confirmed in Table 8 of DS11423. This rating assumes proper PCB copper area (≥100 mm²) under DRAIN pins to maintain junction temperature below 125 °C under full load and worst-case input conditions.

Can VIPER012HS operate without an auxiliary winding?

Yes - VIPER012HS supports self-supply mode using only the VCC capacitor charged by its internal HV current source. When VCC decays to 4.25 V, the IC reactivates the HV source to recharge the capacitor, eliminating the need for an auxiliary winding or bias rectifier in flyback, buck, or buck-boost topologies.

How does the DIS pin function in overvoltage protection schemes?

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 provides threshold setting; for output OVP in non-isolated topologies, the same method applies using output voltage. If unused, DIS must be tied to GND to disable the function.

What thermal resistance values apply to VIPER012HS in standard PCB layouts?

With 100 mm² of 35 µm copper on a single-sided FR4 board, VIPER012HS achieves R_TH-JA = 95 °C/W and R_TH-JC = 5 °C/W. Without added copper, R_TH-JA rises to 155 °C/W. These values are measured per Table 3 in DS11423 and define safe power dissipation limits for thermal design.