STMicroelectronics VIPER011LSTR

Overview

VIPER011LSTR from STMicroelectronics is a high-voltage offline PWM controller IC integrating an 800 V avalanche-rugged N-channel power MOSFET, current-mode 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 energy-compliant low-power SMPS for lighting and home appliances.

For engineers reviewing the VIPER011LSTR datasheet, VIPER011LSTR pinout, VIPER011LSTR application, or VIPER011LSTR equivalent, key selection criteria include its self-supply capability (eliminating bias winding), integrated OCP/OLP/VCC clamp protections, thermal shutdown at 150 °C, and SSOP10 package with five DRAIN terminals for enhanced thermal dissipation.

Technical Context

This IC implements a fixed-frequency current-mode PWM controller with jittered oscillator (60 kHz ±7%), internal transconductance error amplifier (1.2 V reference), and pulse-skip modulation for light-load efficiency. The embedded 800 V MOSFET features R_DS(on) = 30 Ω @ 25 °C and avalanche-rated I_AR = 0.8 A.

Protection architecture includes drain current limiting (120 mA typ.), automatic-restart OLP with 200 ms max delay (L-type), VCC UVLO (4.0 V) and clamp (32.5 V), DIS pin overvoltage detection (1.2 V threshold), and thermal shutdown at 150 °C. Startup uses a switchable HV current source (ICH3 = 8.8 mA typ.) tied to DRAIN.

Key Specifications

Pinout & Package

Delivered in SSOP10 package with exposed thermal pad; five DRAIN pins (6–10) are internally connected to the MOSFET die metal pad and must be soldered to large PCB copper area for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QS03G and LNK306P, VIPER011LSTR uniquely combines 800 V avalanche rating, jittered 60 kHz, self-supply, and integrated DIS-based OVP - enabling simpler, more reliable, and lower-EMI designs for sub-5 W industrial and consumer SMPS.

Availability

VIPER011LSTR is available at Aetrix Electronics and suitable for LED lighting drivers, smart home sensor power supplies, and white goods control board PSUs requiring stable component supply, long-term lifecycle support, and compliance with global energy standards.

Supply support for VIPER011LSTR 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, designing and manufacturing microcontrollers, power ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

VIPER011LSTR belongs to the VIPerPlus family of high-voltage offline controllers engineered specifically for compact, low-cost, energy-efficient AC-DC conversion in sub-10 W applications.

FAQ

What is the maximum continuous output power achievable with VIPER011LSTR in an open-frame design?

VIPER011LSTR delivers up to 4.5 W continuous output power in open-frame configurations at 50 °C ambient, leveraging its SSOP10 package with 100 mm² copper pour (R_TH-JA = 95 °C/W) and 800 V MOSFET. This rating assumes proper PCB layout, adequate heatsinking, and operation within the 60 kHz switching profile - verified per STMicroelectronics DS11423 Rev 2, Table 8.

Can VIPER011LSTR operate without an auxiliary winding?

Yes - VIPER011LSTR supports self-supply mode using only the VCC capacitor charged by its internal HV current source (ICH3 = 8.8 mA typ.). When VCC drops below 4.25 V, the HV source reactivates to recharge the capacitor, eliminating need for auxiliary winding or external bias circuitry in both isolated and non-isolated topologies.

How does the DIS pin provide overvoltage protection?

The DIS pin triggers automatic-restart protection when voltage exceeds 1.2 V for >1 ms. In isolated flyback designs, a resistor divider from the secondary-side optocoupler output pulls DIS high during output overvoltage. In non-isolated buck applications, a divider from the regulated output serves the same function - clamping switching until fault clears.

What is the purpose of the five DRAIN pins in the SSOP10 package?

The five DRAIN pins (6–10) are electrically and thermally paralleled to the internal MOSFET's metal pad. They reduce current density per pin, lower thermal resistance to PCB copper, and improve reliability under pulsed drain currents up to 2 A. PCB layout requires direct copper connection under all five pins to maximize heat dissipation.