STMicroelectronics VIPER100

Overview

VIPer100/SP from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 620 V/3 A vertical power MOSFET, designed for primary-side offline SMPS up to 50 W in universal-input applications. It features adjustable switching frequency up to 100 kHz (typ.), internal start-up current source, undervoltage lockout with 3 V hysteresis, and burst-mode operation enabling <1 W standby consumption per Blue Angel norm.

For engineers reviewing the VIPer100 datasheet, VIPer100 pinout, VIPer100 application, or VIPer100 equivalent, key selection considerations include its integrated HV MOSFET capability, PENTAWATT HV package thermal resistance (1.4 °C/W), COMP-pin-based transconductance error amplifier (1.5 mA/V), and automatic shutdown at VCOMP < 0.5 V for load-dependent burst mode control.

Technical Context

The VIPer100 implements a current-mode control architecture with inner current-sense loop and outer voltage regulation loop, using a SenseFET technique to monitor primary inductor current and compare it against VCOMP. Its oscillator supports external Rt-Ct programming (e.g., 8.2 kΩ + 2.4 nF yields 100 kHz) and accepts external clock synchronization via the OSC pin.

Startup relies on an internal HV current source sourcing from the DRAIN pin until VDD reaches 11 V; UVLO resets at 12 V with 3 V hysteresis. Overtemperature protection triggers at 140–170 °C with 40 °C hysteresis, and the device enters zero-duty-cycle shutdown when VCOMP falls below 0.5 V - enabling self-regulated burst mode without auxiliary circuitry.

Key Specifications

Pinout & Package

The VIPer100/SP is housed in a PENTAWATT HV (022Y) package - a 5-pin, high-voltage, thermally enhanced through-hole package with isolated drain tab for direct heatsinking and creepage/clearance compliant with IEC 60950.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side SMPS controller applications.

Compared with ICE2QS03G and LNK304P, the VIPer100 offers unique integration of HV startup, adjustable frequency, and robust 620 V/2.5 Ω MOSFET in one PENTAWATT HV package - making it optimal for space-constrained, low-BOM, Blue Angel-compliant 50 W adapters where design simplicity and thermal performance are prioritized over maximum efficiency or programmability.

Availability

VIPer100/SP is available at Aetrix Electronics and suitable for USB wall adapters, smart home sensor power supplies, industrial control panel PSUs, and white goods auxiliary supplies requiring stable component supply and long-term lifecycle support.

Supply support for VIPer100/SP 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, specializing in power management, analog, MCU, and automotive ICs with strong manufacturing and packaging capabilities.

The VIPer™ product line targets highly integrated, cost-optimized AC-DC conversion for consumer and industrial power supplies - emphasizing reduced external components, inherent safety features, and compliance with global energy efficiency standards like Blue Angel and Energy Star.

FAQ

What is the maximum continuous output power achievable with VIPer100/SP in a universal-input flyback design?

The VIPer100/SP supports up to 50 W continuous output power in wide-range (85–265 VAC) offline flyback configurations, verified under full-load conditions at 40 °C ambient with proper heatsinking. This rating assumes use of the PENTAWATT HV package's 1.4 °C/W thermal resistance and accounts for conduction and switching losses at 100 kHz. Higher outputs (up to 100 W) are possible only in single-range (e.g., 230 VAC-only) or doubler configurations, as specified in ST's application notes.

How does the VIPer100/SP implement burst mode, and what triggers the transition?

Burst mode is triggered automatically when the COMP pin voltage drops below 0.5 V - a condition occurring when output load falls below the PSTBY threshold (~0.3–0.5 W depending on transformer design). At that point, the PWM latch resets, forcing zero duty cycle. The device remains off until VDD recovers to 12 V and VCOMP rises above 0.5 V again, creating discrete energy bursts. No external components or control signals are required - the behavior is fully internal and tied to regulation loop dynamics.

Can VIPer100/SP be used in primary-side regulation without an optocoupler?

Yes - the VIPer100/SP supports primary-side regulation using its internal 13 V trimmed reference and VDD feedback path. By connecting a resistive divider from the auxiliary winding to VDD, the IC regulates output voltage indirectly via VDD clamping. This eliminates the optocoupler and TL431, reducing cost and improving reliability. However, accuracy is ±5% typical due to transformer turns ratio tolerances and line/load regulation limitations.

What is the purpose of the blanking time (tb = 250–360 ns) and current-sense delay (td = 250 ns) in the VIPer100/SP?

These timing parameters prevent false triggering of the PWM comparator during MOSFET turn-on. The 250 ns blanking time disables the current-sense comparator immediately after gate drive activation, suppressing noise from transformer leakage inductance and diode reverse recovery. The 250 ns propagation delay ensures accurate sampling of true inductor current slope - critical for stable current-mode control and preventing subharmonic oscillation at duty cycles >50%.