STMicroelectronics VIPER113XSTR

Overview

VIPER113XSTR from STMicroelectronics is a high-voltage offline PWM controller IC integrating an 800 V avalanche-rugged N-channel MOSFET, current-mode control, and HV startup circuitry in SSOP10 package. It delivers up to 10 W in non-ventilated adapters at 230 VAC, supports flyback/buck/buck-boost topologies, and features 30 kHz ±7% jittered switching frequency, 370 mA drain current limit, and <10 mW no-load input power consumption. Used in low-power SMPS for home appliances and industrial controls.

For engineers reviewing the VIPER113XSTR datasheet, VIPER113XSTR pinout, VIPER113XSTR application, or VIPER113XSTR equivalent, key selection criteria include its integrated 800 V MOSFET breakdown voltage, 370 mA current limit, 30 kHz ±7% spread-spectrum oscillator, 1.2 V internal error amplifier reference, and thermal shutdown at 150 °C - all critical for energy-efficient, compact AC/DC converter design.

Technical Context

The VIPER113XSTR implements current-mode PWM control with an embedded transconductance error amplifier (GM = 500 μA/V typ.) referenced to 1.2 V, enabling direct feedback via FB pin without optocoupler in non-isolated designs. Its HV startup circuit delivers 1–4 mA charging current to VCC using an internal 800 V auxiliary MOSFET and programmable RG resistor.

It employs pulse-skipping protection to prevent flux runaway during startup by skipping cycles when DRAIN peak current exceeds 370 mA within 300 ns minimum on-time, and integrates soft-start (8 ms) with cycle-by-cycle current limit ramp-up. The jittered 30 kHz oscillator reduces EMI filter size by spreading harmonic energy across ±7% bandwidth at 260 Hz modulation rate.

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 PCB copper area heat sinking (R_TH-JA = 95 °C/W with 100 mm² Cu).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QS03G and LNK364PG, VIPER113XSTR uniquely combines 800 V ruggedness, jittered 30 kHz operation, and direct FB capability - delivering lowest BOM count and best standby efficiency for sub-10 W non-isolated or auxiliary-winding-biased designs.

Availability

VIPER113XSTR is available at Aetrix Electronics and suitable for smart home power supplies, industrial sensor node PSUs, LED drivers for smart lighting, and white goods auxiliary PSUs requiring stable component supply across multi-year production cycles.

Supply support for VIPER113XSTR 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 analog, MCU, power, and MEMS products for industrial, automotive, and consumer markets.

VIPER113XSTR belongs to the VIPerPlus family of high-voltage offline controllers, engineered specifically for ultra-low-standby, compact AC/DC conversion in cost-sensitive, space-constrained applications such as home automation and appliance control.

FAQ

What is the maximum continuous output power achievable with VIPER113XSTR in an open-frame design?

The VIPER113XSTR supports up to 7 W continuous output power in open-frame configurations at 50 °C ambient temperature with adequate PCB copper heatsinking (100 mm²). This rating assumes 230 VAC input, flyback topology, and proper thermal layout - exceeding 7 W requires derating or forced-air cooling per Figure 8 in DS11873 Rev 5.

Can VIPER113XSTR operate without an auxiliary winding in isolated flyback designs?

No - in isolated flyback topologies, VIPER113XSTR requires an auxiliary winding to sustain VCC after startup, as its internal HV startup current source disables once VCC reaches 16 V. Direct VCC connection to output is unsafe due to lack of isolation; the auxiliary winding provides galvanically separated biasing while maintaining regulation accuracy via optocoupler feedback to FB.

How does the pulse-skip function interact with the 30 kHz switching frequency?

Pulse-skip dynamically reduces effective switching frequency below 30 kHz (down to 15 kHz minimum) under light loads by skipping cycles when DRAIN current exceeds 370 mA within 300 ns. This maintains regulation while minimizing switching losses, unlike PFM-only controllers - it preserves fixed-frequency EMI profile at full load while achieving <10 mW no-load consumption.

Is the SSOP10 package RoHS-compliant and lead-free?

Yes - VIPER113XSTR is manufactured in STMicroelectronics' RoHS-compliant, lead-free SSOP10 package (package code: XSTR), qualified to JEDEC J-STD-020 moisture sensitivity level 3, and compatible with standard SnPb and lead-free reflow profiles per DS11873 Rev 5 section 7.1.