STMicroelectronics VIPER011LS

Overview

VIPER011LS from STMicroelectronics is a high-voltage off-line SMPS controller integrating an 800 V avalanche-rugged N-channel MOSFET, current-mode PWM control, and embedded HV startup. It delivers up to 4 W in open-frame designs at 230 VAC, supports 60 kHz ±7% jittered switching, and achieves <10 mW no-load input power at 230 VAC - enabling compliance with stringent energy-saving standards in low-power adapters for home appliances and lighting.

For engineers reviewing the VIPER011LS datasheet, VIPER011LS pinout, VIPER011LS application, or VIPER011LS equivalent, this device is selected for flyback/buck/buck-boost converters requiring integrated high-voltage switching, self-supply capability, low standby consumption, and built-in OCP/OLP/VCC clamp/thermal shutdown protections.

Technical Context

The VIPER011LS implements a fixed-frequency current-mode PWM controller with jittered oscillator (60 kHz ±7%), internal transconductance error amplifier (1.2 V reference), and cycle-by-cycle drain current limiting. Its embedded 800 V MOSFET features R_DS(on) = 30 Ω @ 25°C and supports avalanche energy of 1 mJ (single-pulse).

Startup is enabled via an internal HV current source (ICH3 = 8.8 mA typ. in self-supply mode), while protection logic includes pulse-skip to prevent flux-runaway, automatic restart after OLP/OVP, and soft-start (8 ms) that ramps IDLIM from zero to 240 mA in 8 steps.

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 improved heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VIPER011LS, ICE2QS03G lacks jitter and self-supply, increasing EMI filter cost and component count, while LNK304P mandates external feedback and consumes 3× more no-load power - making VIPER011LS optimal for compact, low-standby, single-chip adapter designs.

Availability

VIPER011LS is available at Aetrix Electronics and suitable for home appliance power supplies, LED lighting drivers, industrial sensor interfaces, and smart home motion controllers requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for VIPER011LS 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.

VIPER01 is ST's energy-efficient off-line high-voltage converter product line, engineered specifically for low-power (<10 W) AC/DC conversion in space-constrained, cost-sensitive applications where integration, efficiency, and reliability are critical.

FAQ

What is the maximum continuous output power achievable with VIPER011LS in an open-frame design?

VIPER011LS delivers up to 4.5 W continuous output power in open-frame configurations at 50 °C ambient, with adequate PCB copper pour under DRAIN pins. This rating assumes 230 VAC input, proper thermal layout (100 mm² Cu), and operation within SOA limits - verified per Figure 23 in DS11423 Rev 2.

Can VIPER011LS operate without an auxiliary winding?

Yes - VIPER011LS supports self-supply mode using only the VCC capacitor charged by its internal HV current source. No auxiliary winding, rectifier, or bias resistor is required, reducing transformer complexity and system cost. The IC automatically reactivates the HV source when VCC drops to 4.25 V.

How does the jittered oscillator reduce EMI in VIPER011LS?

The 60 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 - particularly under average detection - allowing smaller X/Y capacitors and common-mode chokes in the input EMI filter.

What protections are implemented and how do they recover?

VIPER011LS integrates OCP, OLP, line/output OVP, VCC clamp, thermal shutdown, and pulse-skip. All protections except thermal shutdown trigger auto-restart after fixed delays (e.g., 1 s for OLP). Thermal shutdown holds off until junction cools below hysteresis threshold, ensuring safe cooldown before resumption.