STMicroelectronics VIPER100A-22-E

Overview

VIPER100A-22-E from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 700 V/3 A vertical power MOSFET, designed for primary-side switching in offline AC-DC SMPS. It delivers up to 100 W in single-range configurations, features adjustable 90–110 kHz switching frequency, internal 13 V VDD regulation, and burst-mode operation enabling <1 W standby consumption per Blue Angel norm.

For engineers reviewing the VIPER100A-22-E datasheet, VIPER100A-22-E pinout, VIPER100A-22-E application, or VIPER100A-22-E equivalent, key selection considerations include its integrated HV start-up current source, programmable peak current limit (3–5.3 A), thermal shutdown at 140–170 °C, and compatibility with both primary and secondary regulation loops using the COMP pin.

Technical Context

The device implements a current-mode control topology with inner current-sense loop and outer voltage regulation loop, using a transconductance error amplifier (G_m = 1.1–1.9 mA/V) and internal 0.5 V current-sense threshold. Peak current limiting is set by COMP pin voltage (0.7–1.3 V/A gain), with 250 ns blanking time and 350–1200 ns minimum on-time to suppress noise-induced false triggering.

It integrates an HV start-up current source tied to the DRAIN pin, UVLO with 8 V turn-off / 12 V turn-on hysteresis (3 V total), and overtemperature protection with 40 °C hysteresis. The oscillator supports external synchronization via the OSC pin and operates stably across VDD = 9–15 V with ±1% RT and ±5% CT tolerance.

Key Specifications

Pinout & Package

Packaged in PowerSO-10™ (PENTAWATT HV, 022Y footprint), a 10-pin surface-mount package with exposed drain pad for thermal dissipation and isolation between high- and low-voltage sections.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QS03G and LNK306P, VIPER100A-22-E uniquely combines 700 V integration, adjustable frequency, burst-mode autonomy, and dual regulation support-making it optimal for 50–100 W designs requiring minimal external components and strict standby compliance.

Availability

VIPER100A-22-E is available at Aetrix Electronics and suitable for AC-DC adapters, smart home power supplies, industrial control PSUs, and LED driver auxiliary supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for VIPER100A-22-E 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

VIPER100A-22-E belongs to the VIPer™ family of high-voltage SMPS primary controllers, engineered for compact, low-component-count offline power conversion in energy-efficient consumer and industrial applications.

FAQ

What is the purpose of the COMP pin on VIPER100A-22-E?

The COMP pin serves dual functions: it is the output of the transconductance error amplifier (1.5 mA/V typical G_m) for loop compensation, and acts as a shutdown input-pulling voltage below 0.5 V forces zero-duty-cycle burst mode. It interfaces directly with optocoupler outputs in secondary regulation or resistor dividers in primary regulation, enabling flexible feedback architecture without external op-amps.

Can VIPER100A-22-E operate without an auxiliary winding?

No-it relies on the auxiliary winding to sustain VDD after startup. The integrated HV start-up current source charges the VDD capacitor initially, but once VDD reaches 12 V, the internal source shuts off and the auxiliary winding must supply ≥19 mA at 200 kHz. Without it, VDD collapses to 8 V, triggering UVLO shutdown and restarting the cycle, causing repeated pulsing rather than stable operation.

How does the blanking time prevent false current-limit triggering?

The device applies a fixed 250–360 ns blanking window immediately after the MOSFET turns on, during which the current-sense comparator is disabled. This suppresses false triggering caused by parasitic ringing from transformer leakage inductance or secondary rectifier reverse-recovery spikes-ensuring only true primary current ramp is measured for accurate peak limiting and stable operation at high duty cycles.

What thermal derating applies above 25°C case temperature?

With R_thJC = 1.4 °C/W max, junction temperature rises 1.4°C per watt dissipated above the case. At T_C = 70°C, maximum allowable power dissipation drops to (155°C − 70°C) / 1.4 ≈ 61 W before thermal shutdown activates. PCB copper area, heatsink attachment, and airflow directly impact achievable T_C; operation above 100°C case requires forced cooling or power derating per Figure 7 in the datasheet.