STMicroelectronics VIPER319XDTR

Overview

VIPER319XDTR from STMicroelectronics is a high-voltage offline PWM controller IC integrating an 800 V avalanche-rugged N-channel MOSFET, current-mode control, and embedded HV startup circuitry. It delivers up to 31 W in open-frame designs at 50°C ambient, supports flyback/buck/buck-boost topologies, and features 990 mA drain current limit, 132 kHz ±7% jittered switching frequency (H-type), and 1.2 V internal error amplifier reference.

For engineers reviewing the VIPER319XDTR datasheet, VIPER319XDTR pinout, VIPER319XDTR application, or VIPER319XDTR equivalent, key selection criteria include its 800 V MOSFET breakdown rating, ultra-low no-load consumption (<20 mW @230 VAC), integrated OVP/UVP/thermal protections with auto-restart, soft-start timing (8 ms typ.), and SO16N package thermal resistance (R_TH-JA = 85 °C/W with 100 mm² copper).

Technical Context

The VIPER319XDTR implements a fixed-frequency current-mode PWM controller with jittered oscillator (±7% modulation depth at 200 Hz) to reduce EMI filter cost. Its internal transconductance error amplifier (G_M = 550 µA/V typ.) references FB to 1.2 V and drives COMP for loop compensation.

Protection logic includes pulse-skip to prevent flux runaway, auto-restart OLP (50 ms delay), thermal shutdown (155 °C typ.), and separately settable OVP (4 V threshold) and UVP (0.4 V threshold) with 30 ms debounce. The HV startup current source (ICH2 = 8.8 mA typ.) charges VCC from DRAIN until VC_con = 8 V, then disables.

Key Specifications

Pinout & Package

Delivered in SO16N package (16-pin, narrow-body, surface-mount) with exposed drain pads (pins 13–16) for enhanced thermal dissipation (R_TH-JA = 85 °C/W with 100 mm² copper). GND (pin 1) serves as MOSFET source return and bias ground reference; DRAIN pins (13–16) are internally tied to MOSFET drain and metal pad for low-impedance heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE3B0565J and LNK3206P, VIPER319XDTR offers superior universal input support (800 V), lower no-load loss, built-in jitter for EMI reduction, and integrated HV startup-making it optimal for compact, high-efficiency 15–31 W offline converters where board space and regulatory compliance are critical.

Availability

VIPER319XDTR is available at Aetrix Electronics and suitable for home appliance power supplies, industrial sensor node PSUs, and smart lighting drivers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for VIPER319XDTR 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, microcontroller, power, and sensing solutions for industrial, automotive, and consumer markets.

VIPER31 is part of ST's high-voltage AC-DC converter product line, engineered specifically for compact, energy-efficient offline SMPS in cost-sensitive, space-constrained applications such as appliances, lighting, and IoT edge devices.

FAQ

What is the maximum continuous output power achievable with VIPER319XDTR in a vented open-frame design?

VIPER319XDTR delivers up to 31 W continuous output power in open-frame configurations at 50°C ambient temperature, as verified in STMicroelectronics' DS13285 Rev 6 characterization (Table 8). This assumes adequate PCB copper area (100 mm²) under DRAIN pins to achieve R_TH-JA = 85 °C/W and proper transformer design to maintain junction temperature below 150°C under full load.

How does the jittered oscillator reduce EMI in VIPER319XDTR-based designs?

The 132 kHz oscillator modulates ±7% at 200 Hz, spreading harmonic energy across a 18.5 kHz bandwidth instead of concentrating it at discrete frequencies. This lowers peak conducted emissions by ~5–8 dB, enabling compliance with CISPR 22/32 Class B using simpler, lower-cost EMI filters-verified in ST application note AN4170 with measured LISN data.

Can VIPER319XDTR operate without an auxiliary winding for VCC supply?

Yes-VIPER319XDTR integrates a high-voltage startup current source that charges the VCC capacitor directly from the DRAIN pin via an external resistor (RG ≈ 45 MΩ), eliminating the need for an auxiliary winding in most flyback designs. Once VCC reaches 8 V, the HV source disables and the IC runs from stored VCC energy or optional auxiliary supply.

What protection features trigger automatic restart versus latch-off behavior?

Automatic restart occurs for overload/short-circuit (50 ms delay), overvoltage (500 ms restart), and thermal shutdown (resumes after cooling). Pulse-skip, undervoltage disable (UVP), and max duty-cycle limiting do not trigger restart-they suppress switching until the fault condition clears or external reset is applied.