STMicroelectronics VIPER317HDTR

Overview

VIPER317HDTR from STMicroelectronics is an integrated 800 V avalanche-rugged high-voltage PWM converter IC combining a power MOSFET, current-mode controller, HV startup circuit, sense FET, error amplifier, and jittered oscillator in SO-16N package. It delivers up to 31 W in open-frame designs at 50°C ambient, supports flyback/buck/buck-boost topologies, and achieves <20 mW no-load input power at 230 VAC for energy-saving offline SMPS.

For engineers reviewing the VIPER317HDTR datasheet, VIPER317HDTR pinout, VIPER317HDTR application, or VIPER317HDTR equivalent, key selection considerations include its 132 kHz ±7% jittered switching frequency (H-type), 710 mA drain current limit, 1.2 V internal E/A reference, soft-start timing (8 ms typ.), and dual-protection architecture with auto-restart OLP/thermal/OVP and non-auto-restart UVP/pulse-skip.

Technical Context

The VIPER317HDTR implements a current-mode PWM control architecture with embedded transconductance error amplifier referenced to 1.2 V, enabling direct feedback in non-isolated topologies or optocoupler-driven COMP in isolated flyback. Its jittered oscillator spreads spectral energy across ±7% bandwidth at 200 Hz to reduce conducted EMI peaks.

Protection logic includes pulse-skip mode to prevent flux runaway during startup, thermal shutdown at 150–160°C, and separate settable thresholds for overvoltage (4 V typ.) and undervoltage (0.4 V typ.) on dedicated pins - both with configurable debounce and restart timing.

Key Specifications

Pinout & Package

Package: SO-16N (16-pin small outline, exposed drain pads for thermal dissipation). Pin 13–16 are internally connected to MOSFET drain and serve as high-current output terminals and thermal conduction paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VIPER317HDTR, VIPER318HDTR offers higher current capability in identical footprint for power scaling, while ICE3B0565J demands more external components and lacks jitter-based EMI reduction - making VIPER317HDTR preferable for new compact, low-EMI, low-BOM designs.

Availability

VIPER317HDTR is available at Aetrix Electronics and suitable for smart home lighting control, industrial sensor power supplies, and white goods auxiliary PSUs requiring stable component supply, long-term lifecycle support, and compliance with global energy efficiency standards.

Supply support for VIPER317HDTR 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, sensors, and analog devices for industrial, automotive, and consumer markets.

The VIPER™ family targets highly integrated, low-component-count offline SMPS solutions - specifically engineered for energy-efficient, compact, and reliable AC/DC conversion in cost-sensitive, space-constrained applications.

FAQ

What is the maximum continuous output power achievable with VIPER317HDTR in an open-frame design?

VIPER317HDTR delivers up to 31 W in open-frame configurations at 50°C ambient temperature with adequate heat sinking, as verified per STMicroelectronics' DS13285 Rev 6 test conditions using a 1.5 mH transformer primary inductance in flyback topology. Power derating applies above 50°C based on thermal resistance (R_TH-JA = 85 °C/W with 100 mm² copper).

How does the jittered oscillator improve EMI performance compared to fixed-frequency operation?

The 132 kHz ±7% jitter modulates the switching frequency at 200 Hz, spreading harmonic energy across a wider bandwidth. This reduces peak amplitudes in conducted EMI measurements - particularly under average detection - allowing smaller input filters to pass EN 55032/FCC Part 15B without redesigning magnetics or layout.

Can VIPER317HDTR operate in buck topology without an optocoupler?

Yes. In non-isolated buck configurations, the FB pin accepts direct output voltage feedback via a resistive divider referenced to GND, leveraging the internal 1.2 V E/A reference. The COMP pin is then used with an external compensation network - no optocoupler or secondary-side sensing is required.

What happens if the VCC pin voltage exceeds 30.5 V during operation?

If VCC rises above 30.5 V, the internal clamp activates, halting switching to protect the IC. This condition risks thermal overstress and must be avoided via proper auxiliary winding design or external Zener clamping (e.g., 27 V Zener between VCC and GND), as specified in DS13285 Section 4.4.