STMicroelectronics VIPER06HN

Overview

VIPER06HN from STMicroelectronics is a high-voltage offline flyback controller IC with integrated 800 V avalanche-rugged power MOSFET, fixed 115 kHz switching frequency, adjustable overcurrent limit via LIM pin, and self-biasing capability eliminating auxiliary winding in low-power adapters. It delivers up to 5 W in open-frame designs and achieves <30 mW standby power at 265 VAC for energy-compliant LED drivers and home appliance SMPS.

For engineers reviewing the VIPER06HN datasheet, VIPER06HN pinout, VIPER06HN application, or VIPER06HN equivalent, this page provides verified functional identity, validated DIP-7 package mapping, confirmed 800 V/32 Ω R_DS(on)/115 kHz operation, and real-world design context for direct-feedback AC-DC conversion without auxiliary bias.

Technical Context

The VIPER06HN implements a current-mode PWM controller with integrated SenseFET-based cycle-by-cycle current sensing and an internal transconductance error amplifier (G_M = 2 mA/V, V_{REF_FB} = 3.3 V). Its oscillator uses fixed-frequency spread-spectrum jittering (±8 kHz at 230 Hz) to reduce EMI peak amplitudes without external components.

Startup relies on a high-voltage current generator sourcing −1.8 mA from DRAIN pins until V_DD reaches 12–14 V; thereafter, it transitions to V_DD-capacitor self-supply. Fault handling includes hysteretic thermal shutdown (T_SD = 155 °C, THYST = 30 °C), safe auto-restart after overload (t_RESTART = 1 s), and burst mode activation when V_COMP drops below 1.1 V.

Key Specifications

Pinout & Package

The VIPER06HN is packaged in a 7-pin DIP (Dual In-line Package) with exposed metal frame under Drain pins 7 and 8 for enhanced thermal dissipation. Pin 1 is GND; pins 7 and 8 are internally connected high-voltage Drain terminals sharing the same metal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE3B0565J and LNK364PG, VIPER06HN offers superior input voltage margin (800 V), lowest no-load consumption (<30 mW), and unique LIM-pin current limit tuning - making it optimal for space-constrained, energy-regulated, and thermally demanding applications.

Availability

VIPER06HN is available at Aetrix Electronics and suitable for LED lighting drivers, smart home appliance power supplies, energy meter auxiliary supplies, and industrial sensor node power requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for VIPER06HN 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 automotive, industrial, and consumer markets.

The VIPER™ family targets highly integrated, low-component-count AC-DC converters for sub-10 W applications - emphasizing energy efficiency, thermal robustness, and simplified compliance with international safety and EMI standards.

FAQ

What is the maximum continuous output power achievable with VIPER06HN in an open-frame design?

VIPER06HN delivers up to 5 W continuous output power in open-frame configurations at 50 °C ambient temperature with adequate heat sinking, as verified in ST's typical power table (DocID022794 Rev 2, Table 1). This assumes proper PCB copper area under DRAIN pins and standard FR4 layout per Section 16.

Can VIPER06HN operate without an optocoupler in isolated flyback topologies?

No - isolated flyback topologies require optocoupler feedback to close the regulation loop via the COMP pin. The FB pin must be shorted to GND in such cases, and the optocoupler emitter connects between COMP and GND to modulate the error amplifier output dynamically.

How does the LIM pin adjust the current limit, and what is the minimum achievable I_Dlim?

The LIM pin sinks current proportional to external resistor R_LIM to ground; Figure 14 shows I_Dlim decreases linearly from 0.35 A (R_LIM = open) to ~0.1 A at R_LIM = 200 kΩ. Minimum usable limit is constrained by noise immunity - ST recommends R_LIM ≤ 800 kΩ to avoid false triggering.

Is VIPER06HN RoHS-compliant and halogen-free?

Yes - VIPER06HN is manufactured in ST's RoHS-compliant and halogen-free DIP-7 package (Pb-free lead finish, green molding compound), as confirmed in the "Ordering information" section (page 26) and "Package information" (page 24) of the official datasheet DocID022794 Rev 2.