STMicroelectronics VIPER53DIP-E

Overview

VIPER53DIP-E from STMicroelectronics is a high-voltage offline primary switch IC integrating a current-mode PWM controller and a 620 V MDMesh™ Power MOSFET in a DIP-8 package. It delivers up to 30 W at universal input (85–265 VAC) or 50 W at European input (195–265 VAC), features adjustable peak current limitation (2 A typ), 100 kHz oscillator frequency (±7%), and built-in thermal shutdown (160 °C). It is used in compact AC/DC flyback converters for auxiliary power supplies in industrial controls and smart meters.

For engineers reviewing the VIPER53DIP-E datasheet, VIPER53DIP-E pinout, VIPER53DIP-E application, or VIPER53DIP-E equivalent, key selection criteria include its integrated HV startup current source (−12 mA), COMP pin transconductance (1.4 mS), undervoltage lockout hysteresis (3.1 V), burst-mode standby compliance with "Blue Angel" (<0.5 W), and primary-side regulation capability without optocoupler.

Technical Context

The VIPER53DIP-E implements fixed-frequency current-mode control with cycle-by-cycle peak current sensing via internal SenseFET and COMP pin voltage comparison. Its oscillator uses an external R_T-C_T network to set switching frequency between 93–107 kHz, with blanking time (300–500 ns) suppressing transformer leakage spikes.

It integrates dual protection architecture: overload detection triggers at V_COMP = 4.35 V with 8 ms delay via TOVL capacitor, while overtemperature shutdown activates at 160 °C with 40 °C hysteresis. The error amplifier is transconductance-type (G_m = 1.4 mS), referenced to 15 V on VDD, enabling primary-side regulation through VDD feedback.

Key Specifications

Pinout & Package

DIP-8 package with creepage ≥5.5 mm and isolation rated for 3 kV_RMS. Tab connected to SOURCE pin for thermal relief and ground reference.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar offline primary switch applications.

Compared with ICE3B0565J and LNK304P, the VIPER53DIP-E uniquely combines programmable overload timing, "Blue Angel"-compliant burst mode, and transconductance error amplification for true primary-side regulation-enabling fewer components, tighter output tolerance, and guaranteed eco-label compliance without design iteration.

Availability

VIPER53DIP-E is available at Aetrix Electronics and suitable for industrial auxiliary power supplies, smart meter power modules, home appliance control boards, and IoT gateway standby supplies requiring stable component supply, long-lifecycle support, and regulatory-compliant low-power operation.

Supply support for VIPER53DIP-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.

The VIPer™ family is designed specifically for highly integrated, low-component-count offline SMPS controllers-targeting cost-sensitive, space-constrained AC/DC applications from 1 W to 50 W with emphasis on safety, reliability, and regulatory compliance.

FAQ

What is the minimum recommended value for the COMP-to-ground capacitor?

The datasheet specifies a minimum of 8 nF for stability of the transconductance error amplifier. A 10 nF ceramic capacitor is recommended to ensure phase margin >45° across temperature and line/load variations. Values below 8 nF risk oscillation during transient load steps or startup, especially when using primary-side regulation without optocoupler feedback.

Can VIPER53DIP-E operate without an external TOVL capacitor?

Yes, but overload protection becomes immediate (no delay) if TOVL is left floating or shorted to ground. The device will shut down within microseconds when V_COMP exceeds 4.35 V, increasing risk of nuisance tripping during startup or light-load transients. ST recommends a 100 nF capacitor for standard 8 ms delay, as validated in Figure 4 of the datasheet.

How does the internal high-voltage startup current source function?

The DRAIN pin sources −12 mA (typ) into the VDD capacitor during initial power-up, eliminating the need for a high-wattage startup resistor. This current flows only until VDD reaches 11.5 V, then shuts off automatically. It enables direct connection to rectified AC line and reduces no-load power by >150 mW compared to resistor-started alternatives.

Is VIPER53DIP-E compatible with DIP-8 sockets for prototyping?

Yes-the DIP-8 footprint matches standard 0.3″ wide IC sockets (0.1″ pin pitch). However, thermal performance degrades significantly without soldered tab connection to copper pour. For functional validation, mount the socket directly over ≥50 mm² of 35 µm copper tied to SOURCE pins 1 and 7; do not rely on socket contact alone for heat dissipation above 15 W.