STMicroelectronics VIPER20DIP-E

Overview

VIPER20DIP-E from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 620 V/0.5 A vertical power MOSFET in DIP-8 package, designed for offline AC-DC SMPS primary-side regulation. It delivers up to 20 W in single-range configurations, features adjustable 90–110 kHz switching frequency, internal start-up supply, undervoltage lock-out (8 V turn-on / 7.5 V shutdown), and burst-mode operation enabling <1 W standby consumption per Blue Angel norm.

For engineers reviewing the VIPER20DIP-E datasheet, VIPER20DIP-E pinout, VIPER20DIP-E application, or VIPER20DIP-E equivalent, key selection considerations include its integrated HV MOSFET capability, primary-side regulation compatibility, thermal shutdown at 140–190 °C, and COMP-pin-controlled burst mode activation below 0.5 V - all critical for low-power adapter, auxiliary supply, and energy-efficient consumer power designs.

Technical Context

The VIPER20DIP-E implements a current-mode control topology with an internal transconductance error amplifier (G_m = 1.5 mA/V typical) and a dedicated PWM comparator with 250 ns blanking time and 350 ns minimum on-time. Its oscillator uses external R_T/C_T network (e.g., 8.2 kΩ/2.4 nF) to set frequency between 90–110 kHz, stable over V_DD = 9–15 V.

It integrates a high-voltage start-up current source referenced to the DRAIN pin, enabling direct connection to rectified mains without external bias winding. Over-temperature protection triggers at 140–190 °C with 40 °C hysteresis, and the device enters automatic burst mode when V_COMP falls below 0.5 V - eliminating need for external standby control circuitry.

Key Specifications

Pinout & Package

Package: DIP-8 (PENTAWATT HV, 022Y footprint), through-hole mount, 1.9 °C/W junction-to-case thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QS03G and LNK304P, VIPER20DIP-E uniquely combines adjustable frequency, integrated HV start-up, and COMP-triggered burst mode - making it optimal for designers needing both energy compliance and design flexibility in <20 W offline supplies.

Availability

VIPER20DIP-E is available at Aetrix Electronics and suitable for USB wall adapters, smart home auxiliary supplies, white goods control boards, and industrial panel PC power requiring stable component supply across long-lifecycle consumer and industrial programs.

Supply support for VIPER20DIP-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, delivering silicon solutions for automotive, industrial, and power management applications with emphasis on integration and reliability.

The VIPer family targets cost-sensitive, high-efficiency AC-DC conversion - specifically engineered to replace discrete MOSFET + controller combinations in sub-25 W offline power supplies.

FAQ

What is the maximum continuous output power achievable with VIPER20DIP-E?

VIPER20DIP-E supports up to 20 W in single-range (e.g., 230 V_AC only) or doubler configurations, and 10 W in universal-input (85–265 V_AC) flyback designs. This limit arises from its 0.67 A typical peak current and 16 Ω R_DS(on), which constrain conduction and switching losses under thermal constraints (R_thJC = 1.9 °C/W).

Can VIPER20DIP-E operate with secondary-side regulation using an optocoupler?

Yes - VIPER20DIP-E supports both primary- and secondary-side regulation. In optocoupler-based designs, the COMP pin acts as a constant-current sink: the optocoupler LED current modulates V_COMP, and crossing 0.5 V triggers burst mode. The internal 13 V V_DD regulator remains active, ensuring stable control supply regardless of feedback configuration.

How does the internal start-up current source function, and what external components does it require?

The internal start-up current source draws bias directly from the DRAIN pin during power-up, charging the external VDD capacitor (typically 10–47 µF). No external high-voltage resistor is needed. Once V_DD reaches 11 V, the source disables and the auxiliary winding takes over. CVDD sizing follows C_VDD > I_DD × t_SS / V_DDhyst, where V_DDhyst = 3 V min and t_SS depends on transformer and load.

Is VIPER20DIP-E still in active production, and what is its obsolescence status?

VIPER20DIP-E is marked "Obsolete Product(s)" in ST's official documentation (Rev 1, Sept 2005), but remains available through authorized distributors and Aetrix Electronics' legacy component program. It is supported for existing designs with full traceability, and recommended only for maintenance, replacement, or cost-sensitive legacy upgrades - not for new designs requiring long-term supply assurance.