STMicroelectronics VIPER013XSTR

Overview

VIPER013XSTR from STMicroelectronics is a high-voltage off-line SMPS controller integrating an 800 V avalanche-rugged N-channel power MOSFET, current-mode PWM control, and embedded HV startup circuitry. It delivers up to 4 W in open-frame designs at 230 VAC, supports flyback/buck/buck-boost topologies, and features 30 kHz ±7% jittered switching frequency, <10 mW no-load input power at 230 VAC, and built-in OCP/OLP/OVP/thermal shutdown protections.

For engineers reviewing the VIPER013XSTR datasheet, VIPER013XSTR pinout, VIPER013XSTR application, or VIPER013XSTR equivalent, this device is selected for ultra-low standby power, wide universal AC input (85–265 VAC), compact adapter design, and EMI-reduced operation in home appliance and lighting power supplies.

Technical Context

The VIPER013XSTR implements a fixed-frequency current-mode PWM controller with integrated 800 V MOSFET and self-supply capability-eliminating need for auxiliary winding or bias components. Its internal sense-FET enables lossless current sensing, while the jittered oscillator (30 kHz ±7%) spreads spectral energy to reduce conducted EMI filter size.

Protection architecture includes cycle-by-cycle OCP (360 mA typ. drain current limit), pulse-skip flux-runaway prevention, automatic-restart OLP (100 ms max. overload delay), VCC clamp (32.5 V typ.), and thermal shutdown at 155 °C. The error amplifier features 1.2 V reference and transconductance of 500 µA/V, supporting primary- or secondary-side regulation via FB/COMP pins.

Key Specifications

Pinout & Package

Package: SSOP10 (3.9 mm × 4.9 mm, 0.65 mm pitch), thermally enhanced with DRAIN pins (6–10) 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 SMPS controller applications.

Compared with VIPER013XSTR, ICE2QS03G offers simpler gate drive but lacks jitter and self-supply-increasing no-load loss and EMI filter size; LNK306P adds safety features at the cost of design complexity and higher component count.

Availability

VIPER013XSTR is available at Aetrix Electronics and suitable for smart lighting drivers, white goods auxiliary supplies, IoT adapters, and industrial control panel PSUs requiring stable component supply, long-lifecycle support, and compliance with global energy standards.

Supply support for VIPER013XSTR 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

VIPER01 series belongs to ST's Energy Saving Off-Line High Voltage Converter product line, engineered specifically for ultra-low standby power, compact size, and simplified design of sub-10 W AC-DC power supplies.

FAQ

What is the maximum continuous output power achievable with VIPER013XSTR in an open-frame design?

VIPER013XSTR delivers up to 4.5 W continuous output power in open-frame configurations at 50 °C ambient temperature with adequate heatsinking, as confirmed in ST's DS11423 Rev 2 (Table 8). This rating assumes proper PCB copper area (≥100 mm²) under DRAIN pins and optimized transformer design for 30 kHz operation.

Can VIPER013XSTR operate without an auxiliary winding?

Yes-VIPER013XSTR supports self-supply mode where the internal HV current source recharges the VCC capacitor during MOSFET OFF time, eliminating need for auxiliary winding or bias components. This reduces transformer complexity and achieves <10 mW no-load input power at 230 VAC.

How does the jittered oscillator improve EMI performance?

The 30 kHz switching frequency is modulated ±7% at 260 Hz, spreading harmonic energy across a bandwidth instead of concentrating it at discrete frequencies. This lowers peak conducted emissions-especially under average detection-allowing smaller, lower-cost EMI filters to pass CISPR-32 Class B tests.

What protection mechanisms prevent transformer saturation during startup?

VIPER013XSTR uses pulse-skip protection: if peak drain current exceeds 360 mA within the minimum on-time (360 ns), the controller skips that switching cycle. This prevents flux runaway during startup or light-load conditions, avoiding core saturation and associated stress on the MOSFET and transformer.