STMicroelectronics VIPER100ASP-E

Overview

VIPER100ASP-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 VIPER100ASP-E datasheet, VIPER100ASP-E pinout, VIPER100ASP-E application, or VIPER100ASP-E equivalent, key selection criteria include its integrated HV start-up current source, 250 ns blanking time for noise immunity, 1.7 µs disable setup time, thermal shutdown at 140–170 °C, and compatibility with both primary and secondary regulation loops using minimal external components.

Technical Context

The VIPER100ASP-E implements a current-mode control topology with dual-loop regulation: an inner peak-current loop (sensed via integrated SenseFET) and outer voltage loop via transconductance error amplifier (Gm = 1.5 mA/V). Its oscillator uses an external RT–CT network and supports synchronization to external clock sources.

Startup relies on an integrated high-voltage current source tied to the DRAIN pin, automatically disabled once VDD reaches 11 V; UVLO hysteresis (2.4–3 V) ensures robust restart behavior. Overtemperature protection triggers at 140–170 °C with 40 °C hysteresis, and burst mode activates when COMP falls below 0.5 V-enabling zero-duty-cycle shutdown during light/no-load conditions.

Key Specifications

Pinout & Package

Package: PowerSO-10™ (PENTAWATT HV, 022Y footprint), surface-mount, thermally enhanced with exposed drain pad for heatsinking.

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, VIPER100ASP-E uniquely combines adjustable frequency, integrated 700 V/3 A MOSFET, and automatic burst-mode entry-making it optimal for compact, high-efficiency 50–100 W offline supplies requiring regulatory compliance and minimal external parts.

Availability

VIPER100ASP-E is available at Aetrix Electronics and suitable for AC-DC adapters, LED drivers, industrial sensor supplies, and smart home auxiliary power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for VIPER100ASP-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, delivering intelligent power, microcontrollers, sensors, and analog solutions for industrial, automotive, and consumer markets.

The VIPer™ product line targets highly integrated, cost-optimized AC-DC conversion ICs-designed specifically for offline SMPS up to 100 W with emphasis on reduced external component count, low standby power, and robust protection features.

FAQ

What is the maximum continuous output power achievable with VIPER100ASP-E?

VIPER100ASP-E supports up to 50 W under universal input (85–265 VAC) and up to 100 W in single-range (e.g., 230 VAC only) or doubler configurations. Power capability depends on transformer design, heatsinking, and ambient temperature-derating is required above 70 °C case temperature per R_thJC = 1.4 °C/W.

How does the integrated start-up current source function?

The start-up current source draws bias directly from the DRAIN pin during initial power-on, charging the external VDD capacitor until VDD reaches 11 V (UVLO reset threshold). Once active, the source disables automatically, and VDD is sustained by the transformer's auxiliary winding. Under fault conditions (e.g., shorted output), it cycles between 7.5 V (shutdown) and 11 V (restart) with ~12% duty cycle.

Can VIPER100ASP-E operate with secondary-side regulation using an optocoupler?

Yes-VIPER100ASP-E supports secondary regulation via optocoupler feedback connected to the COMP pin. When VDD is held between 8.5 V and 12.5 V (not regulated at 13 V), the transconductance amplifier output behaves as a constant current source, allowing direct optocoupler connection without additional biasing. Regulation accuracy depends on COMP pin impedance and compensation network design.

What is the purpose of the 250 ns blanking time (t_b)?

The 250 ns blanking time disables the current-sense comparator immediately after MOSFET turn-on to suppress false triggering caused by parasitic ringing from transformer leakage inductance or secondary rectifier reverse recovery. This ensures accurate peak-current detection and prevents premature switch-off during transient events.