STMicroelectronics VIPER53DIP

Overview

VIPER53DIP from STMicroelectronics is an integrated high-voltage primary-side PWM controller with embedded 620 V MDMesh™ Power MOSFET in DIP-8 package, designed for off-line AC-DC power supplies up to 30 W (wide-range 85–265 Vac) or 50 W (European 195–265 Vac). It features current-mode control, adjustable peak current limitation (2.0 A typ), 100 kHz oscillator frequency (±7% over temp), and built-in protections including UVLO (11.5 V start / 8.4 V stop), overtemperature shutdown (160 °C), and overload delay via TOVL pin.

For engineers reviewing the VIPER53DIP datasheet, VIPER53DIP pinout, VIPER53DIP application, or VIPER53DIP equivalent, this device is selected for compact, low-cost, primary-regulated SMPS designs requiring <0.5 W standby power ("Blue Angel" compliant), robust short-circuit recovery, and integrated startup current source - especially where secondary feedback is impractical or cost-sensitive.

Technical Context

The VIPER53DIP implements a current-mode PWM architecture with cycle-by-cycle peak drain current sensing via internal transconductance error amplifier output (COMP pin) and dedicated blanking (300–500 ns) to suppress transformer/rectifier noise. Its oscillator supports external Rt-Ct programming (e.g., 8 kΩ + 2.2 nF → 100 kHz), and its high-voltage startup circuit delivers −12 mA into VDD at VDS = 100 V before regulation.

Protection logic includes dual-threshold UVLO with 3.1 V hysteresis, VDD overvoltage lockout at 18 V, COMP-based overload detection (4.35 V threshold), and thermal shutdown with 40 °C hysteresis. Standby burst mode activates when COMP falls below 0.5 V, reducing average switching frequency while maintaining output regulation and limiting no-load input power to <0.5 W.

Key Specifications

Pinout & Package

DIP-8 plastic dual-in-line package with creepage ≥5 mm between high-voltage (DRAIN) and low-voltage (SOURCE, COMP, TOVL) pins; tab not internally connected - requires external heatsink mounting only if dissipating >1.5 W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VIPER53DIP, STVIPER06XS offers lower conduction loss but forfeits programmable protection timing and burst-mode accuracy, while ICE3B0565J adds safety features at the expense of design flexibility in current control and frequency tuning.

Availability

VIPER53DIP is available at Aetrix Electronics and suitable for AC-DC wall adapters, smart home power supplies, industrial control modules, and appliance auxiliary PSUs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for VIPER53DIP 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.

The VIPer™ product line delivers highly integrated AC-DC primary-side controllers targeting cost-sensitive, space-constrained off-line power supplies from 1 W to 50 W - emphasizing single-chip simplicity, safety compliance, and minimal external component count.

FAQ

What is the minimum recommended value for the compensation capacitor on the COMP pin?

The datasheet specifies a minimum 8 nF capacitor between COMP and ground to ensure stability of the transconductance error amplifier. A 10 nF ceramic capacitor is recommended for all operating conditions, as values below 8 nF risk oscillation or poor transient response in both primary- and secondary-feedback configurations.

Can VIPER53DIP operate without an auxiliary winding for VDD supply?

No - the device requires an auxiliary winding to provide regulated 15 V to the VDD pin after startup. The internal HV startup current source (−12 mA) only charges the VDD capacitor until ~11.5 V; sustained operation depends on auxiliary winding feedback regulating VDD to 15 V. Omitting it causes immediate shutdown after startup.

How does the TOVL pin affect overload response time?

The TOVL pin connects to an external capacitor that sets a fixed 8 ms delay before overload shutdown activates when COMP exceeds 4.35 V. With C_TOVL = 100 nF, the internal timer generates a precise 8 ms window - allowing brief overloads (e.g., motor startup) to pass without latching off, while still protecting against sustained shorts.

Is VIPER53DIP compatible with DIP-8 sockets for prototyping?

Yes - the VIPER53DIP uses standard 0.3-inch DIP-8 footprint with 2.54 mm pin pitch and 7.62 mm row spacing. Its 10-pin configuration (with three NC pins) fits industry-standard DIP-8 sockets, enabling rapid evaluation on breadboards or test fixtures without soldering.