STMicroelectronics VIPER011XS

Overview

VIPER011XS from STMicroelectronics is a high-voltage off-line SMPS controller integrating an 800 V avalanche-rugged N-channel power MOSFET, current-mode PWM control, embedded HV startup, and sense-FET - enabling flyback, buck, and buck-boost topologies for <5 W AC/DC adapters and home appliance power supplies. It delivers 4 W at 85–265 VAC (open frame), supports self-supply mode eliminating auxiliary windings, and achieves <10 mW no-load input power at 230 VAC.

For engineers reviewing the VIPER011XS datasheet, VIPER011XS pinout, VIPER011XS application, or VIPER011XS equivalent, key selection criteria include its 30 kHz ±7% jittered switching frequency (X-type), 120 mA typical drain current limit, 4.5–30 V VCC operating range, and SSOP10 package with five dedicated DRAIN pins for thermal management and SOA compliance.

Technical Context

The VIPER011XS implements a fixed-frequency current-mode PWM controller with integrated 800 V power switch and on-chip high-voltage startup current source (ICH3 = 8.8 mA typ. in self-supply). Its transconductance error amplifier features a 1.2 V reference and drives COMP to regulate peak drain current via feedback from FB.

Protection architecture includes automatic-restart OCP (120 mA typ.), OLP (50 ms delay), line/output OVP, thermal shutdown at 155 °C, and pulse-skip logic preventing flux runaway. Jittered oscillator (±7% spread at 260 Hz) reduces EMI filter cost while maintaining deterministic timing for light-load PFM transitions.

Key Specifications

Pinout & Package

Package: SSOP10 (3.9 mm × 4.9 mm, 0.65 mm pitch), thermally enhanced with five parallel DRAIN pins connected to internal MOSFET die 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 VIPER011XS, ICE2QS03G offers lower BOM cost but sacrifices universal input capability and EMI performance, while LNK364PG provides tighter safety integration yet lacks the flexible FB/COMP dual-regulation architecture required for non-isolated topologies.

Availability

VIPER011XS is available at Aetrix Electronics and suitable for low-power AC/DC adapters, smart home sensor power supplies, and white goods control board standby converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for VIPER011XS 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, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

VIPER011XS belongs to the VIPerPlus family of high-voltage offline controllers, engineered specifically for ultra-low standby power, minimal external component count, and robust operation in cost-sensitive, space-constrained AC/DC power supplies.

FAQ

What is the maximum continuous output power achievable with VIPER011XS in an open-frame design?

VIPER011XS delivers up to 4.5 W continuous output power in open-frame configurations at 50 °C ambient temperature with adequate PCB copper heatsinking (100 mm², 35 µm Cu). This rating assumes proper layout for thermal relief on DRAIN pins and use of recommended snubber components per Section 4.2 of DS11423. Power derates linearly above 50 °C ambient due to thermal shutdown threshold.

Can VIPER011XS operate without an auxiliary winding?

Yes - VIPER011XS supports self-supply mode using only the VCC capacitor charged by its internal HV current source. During steady-state operation, VCC decays to ~4.25 V, triggering reactivation of the HV source to recharge the capacitor. This eliminates need for auxiliary winding, bias diode, and series resistor, reducing BOM count and board area significantly.

How does the DIS pin implement overvoltage protection?

The DIS pin triggers auto-restart OVP when voltage exceeds 1.2 V for more than 1 ms. In isolated flyback designs, a resistive divider from the auxiliary winding feeds DIS to detect output overvoltage. In non-isolated buck topologies, the same divider connects from output to DIS. If unused, DIS must be soldered directly to GND to disable the function and avoid floating node noise coupling.

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

The five DRAIN pins are internally bonded to the MOSFET die metal pad to minimize thermal resistance and distribute high pulsed drain current (up to 2 A peak). On PCB, they must be connected to a shared copper pour (≥100 mm²) to achieve R_TH-JA = 95 °C/W. This configuration sustains 800 V avalanche energy (1 mJ) and prevents localized heating that could trigger premature thermal shutdown.