STMicroelectronics VIPER17HD

Overview

VIPER17HD from STMicroelectronics is a high-voltage integrated flyback controller with an 800 V avalanche-rugged N-channel power MOSFET, PWM control, adjustable current limit (0.4 A typ.), 115 kHz switching frequency, and <30 mW standby power at 265 VAC - designed for compact, energy-compliant AC/DC adapters and auxiliary supplies in consumer electronics.

For engineers reviewing the VIPER17HD datasheet, VIPER17HD pinout, VIPER17HD application, or VIPER17HD equivalent, key selection criteria include its SO16 narrow package thermal performance (R_thJA = 80 °C/W on FR4), burst-mode operation at light load, integrated brown-out protection (V_BRth = 0.45 V), and dual-level overcurrent protection with hiccup mode recovery.

Technical Context

The VIPER17HD implements current-mode PWM control with fixed 115 kHz oscillator frequency and ±8 kHz jittering to reduce EMI peak emissions. Its integrated 800 V power section uses SenseFET architecture for lossless current sensing and supports direct high-voltage startup from the DRAIN pin (V_{DRAIN_START} = 80 V typ.).

Control logic includes digitally filtered OVP strobing (T_STROBE = 2.2 µs), programmable cycle-by-cycle current limit via CONT pin resistor, and auto-restart with 4.5 V restart threshold (V_DD(RESTART)) and reduced 0.6 mA charging current after fault - ensuring safe, low-duty-cycle recovery.

Key Specifications

Pinout & Package

VIPER17HD is housed in a SO16 narrow (SOIC-16) surface-mount package with exposed thermal pad connected to pins 7–16 (DRAIN). The package supports 1 W power dissipation at T_A < 60 °C with R_thJA = 80 °C/W on standard FR4 (100 mm² copper).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE3B0565J and LNK306P, VIPER17HD delivers superior universal input resilience (800 V), lower standby power (<30 mW), and deterministic OVP with noise-immune strobing - making it optimal for next-generation compact, high-efficiency adapters targeting global markets.

Availability

VIPER17HD is available at Aetrix Electronics and suitable for smartphone adapters, LCD TV auxiliary supplies, no-el-cap LED drivers, and set-top box SMPS requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for VIPER17HD 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, with design, manufacturing, and R&D operations across Europe, Asia, and the Americas.

VIPER17HD belongs to ST's VIPerPlus family of high-voltage AC/DC converters - engineered specifically for compact, low-cost, energy-compliant offline power supplies in consumer and industrial applications.

FAQ

What is the minimum recommended copper area under the DRAIN pins for thermal performance?

The DRAIN pins (13–16) are internally connected to the exposed thermal pad. ST recommends ≥100 mm² of 35 µm-thick copper on the bottom layer, directly beneath the SO16N package, to achieve the specified R_thJA = 80 °C/W. Thermal vias (≥6 × 0.3 mm) should connect this copper to inner ground planes to maximize heat transfer.

Can the CONT pin be left unconnected for default current limit operation?

Yes - leaving the CONT pin open or connecting it to GND via a resistor >100 kΩ configures the device to its default current limit of 0.4 A. However, ST strongly recommends connecting a defined RLIM resistor (e.g., 47 kΩ for 0.3 A) to ensure consistent current limiting across temperature and unit-to-unit variation.

How does the brown-out protection behave during AC line cycling?

The BR pin detects input sags with 0.45 V falling threshold and 50 mV hysteresis. When V_BR drops below threshold, the IC shuts down non-latching - resuming normal operation only after V_BR rises above 0.50 V. This prevents flickering or repeated restarts during brief line interruptions common in residential grids.

Is the VIPER17HD compatible with quasi-resonant (QR) flyback topologies?

No - VIPER17HD operates in fixed-frequency PWM mode with jittering and does not support valley-switching or QR control. It is optimized for continuous conduction mode (CCM) and discontinuous conduction mode (DCM) flyback designs. For QR operation, ST recommends the VIPer0P or SRK1001 controller families.