STMicroelectronics VIPER0PHD

Overview

VIPER0PHD from STMicroelectronics is a zero-power-mode (ZPM) off-line high-voltage converter IC integrating an 800 V avalanche-rugged power MOSFET, current-mode PWM controller, embedded HV startup and sense-FET, and self-supply capability. It delivers up to 12 W in non-ventilated adapters at 230 VAC, achieves <4 mW no-load input power at 230 VAC in ZPM, and supports flyback, buck, and buck-boost topologies for AC/DC conversion in smart home appliances and industrial controls.

For engineers reviewing the VIPER0PHD datasheet, VIPER0PHD pinout, VIPER0PHD application, or VIPER0PHD equivalent, this device is selected for ultra-low standby consumption, wide 85–265 VAC input coverage, jittered 120 kHz ±7% switching frequency to reduce EMI filter cost, integrated thermal shutdown, and MCU-controllable ZPM entry/exit via dedicated ON/OFF pins.

Technical Context

The VIPER0PHD implements a fixed-frequency current-mode PWM controller with built-in oscillator jitter (±7% at 260 Hz) to spread spectral energy and lower conducted EMI. Its 800 V MOSFET enables direct operation from universal AC mains without external snubber scaling, while the integrated sense-FET provides lossless primary-side current sensing for accurate cycle-by-cycle OCP.

ZPM operation is managed through dedicated ON/OFF pins with internal pull-up resistors (41 kΩ typ.) and precise voltage thresholds (VONth/VOFFth = 0.75–1.25 V), enabling MCU-driven deep-sleep control. The error amplifier features a 1.2 V reference referenced to EAGND and separate ground for negative-output flyback designs, with COMP output directly drivable by optocoupler in secondary-regulated configurations.

Key Specifications

Pinout & Package

Package: SO16 narrow (SO16N), with DRAIN pins (13–16) thermally connected to internal MOSFET metal pad; requires PCB copper area under DRAIN pins for thermal management (R_thJA = 80 °C/W on 100 mm² FR4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE3B0565J and LNK3206P, VIPER0PHD uniquely combines 800 V ruggedness, jittered 120 kHz operation, and hardware-debounced ZPM control-enabling certified <4 mW no-load performance and simplified MCU integration in next-gen smart devices.

Availability

VIPER0PHD is available at Aetrix Electronics and suitable for smart home lighting control, industrial PLC auxiliary supplies, and home appliance SMPS requiring stable component supply, long-term lifecycle support, and compliance with EU CoC Tier 2 and ERP Lot 6 energy standards.

Supply support for VIPER0PHD 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 products for industrial, automotive, and consumer markets.

VIPER0PHD belongs to the VIPerPlus family of high-voltage offline converters engineered for ultra-low standby power, wide-input AC/DC conversion, and simplified system design in space-constrained, energy-sensitive applications.

FAQ

What is the purpose of the EAGND pin, and how should it be connected?

EAGND serves as the ground reference for the internal error amplifier and its 1.2 V reference. In non-isolated flyback converters with negative output, connect EAGND directly to the negative rail. For positive outputs, short EAGND to SGND. Incorrect routing-such as tying EAGND to PGND-causes feedback instability and regulation failure due to ground loop noise.

How does the self-supply mode eliminate the need for an auxiliary winding?

In self-supply mode, only a single capacitor (CS) connects between VCC and SGND. After startup, VCC decays to ~4.25 V, triggering the internal HV current source to recharge CS with 7.8 mA (typ.). This cycle repeats during MOSFET OFF time, sustaining operation without auxiliary winding, bias diode, or RC network-reducing transformer complexity and bill-of-materials count.

Can VIPER0PHD be used in a buck topology, and what are the layout constraints?

Yes-VIPER0PHD supports buck topology with the MOSFET as high-side switch and DRAIN connected to input. Critical constraints include: (1) PGND must serve as both MOSFET source and power return; (2) input bulk capacitor must be placed adjacent to DRAIN and PGND pins; (3) SGND and EAGND must be joined at a single point near the IC to avoid control loop oscillation; (4) FB divider must reference output ground, not input.

What protections are implemented, and how do they behave during fault conditions?

VIPER0PHD integrates OCP (via drain current limit), OLP (with 50 ms delay), VCC clamp (32.5 V), pulse-skip (prevents flux runaway), and thermal shutdown (155 °C). All protections trigger automatic restart after 1 s except thermal shutdown, which holds until junction cools below hysteresis threshold. No external latch or reset circuitry is needed-simplifying design and improving reliability in unattended equipment.