STMicroelectronics VIPER53SP13TR

Overview

VIPER53SP13TR from STMicroelectronics is an integrated high-voltage offline primary switch combining a current-mode PWM controller and a 620 V MDMesh™ Power MOSFET in PowerSO-10™ package. It delivers up to 40 W output power under single European input (195–265 Vac), features adjustable peak current limit (2 A typ.), 100 kHz oscillator frequency (±7 kHz), and built-in overtemperature (160 °C) and overload protection. It targets compact, low-noise AC/DC adapters and auxiliary supplies with primary or optocoupler-based feedback.

For engineers reviewing the VIPER53SP13TR datasheet, VIPER53SP13TR pinout, VIPER53SP13TR application, or VIPER53SP13TR equivalent, key selection criteria include its integrated startup current source (−12 mA), VDD regulation at 15 V (±0.5 V), COMP pin transconductance (1.4 mS), and burst-mode standby compliance with Blue Angel (<0.5 W input).

Technical Context

The VIPER53SP13TR implements a current-mode control architecture with cycle-by-cycle peak current sensing via internal SenseFET and COMP pin voltage comparison. Its inner loop regulates drain current using a 2 V/A gain (HCOMP), while the outer loop sets COMP voltage via internal error amplifier (primary feedback) or optocoupler-coupled TL431 (secondary feedback).

It integrates a 100 kHz oscillator with external Rt-Ct programmability, blanking time that adapts to COMP voltage (150 ns / 400 ns), and automatic burst-mode transition triggered when COMP falls below 0.5 V. Thermal shutdown activates at 160 °C with 40 °C hysteresis, and overload protection delays shutdown by up to 8 ms using an external TOVL capacitor.

Key Specifications

Pinout & Package

Package: PowerSO-10™ - Exposed tab for enhanced thermal dissipation (R_thj-case = 2 °C/W); surface-mount, RoHS-compliant, 10-pin asymmetric layout with drain-connected tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE3B0565J and LNK306P, VIPER53SP13TR offers unique COMP-pin programmability for current limit and loop compensation, true primary-side regulation, and certified Blue Angel standby-making it optimal for mid-power (25–40 W), feature-rich, and regulatory-compliant designs.

Availability

VIPER53SP13TR is available at Aetrix Electronics and suitable for AC/DC wall adapters, smart home power supplies, industrial control auxiliary rails, and white goods display power requiring stable component supply across extended product lifecycles.

Supply support for VIPER53SP13TR 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

VIPER™ is ST's proprietary family of high-voltage offline primary controllers integrating MOSFETs and protection features for cost-sensitive, space-constrained AC/DC conversion-targeting sub-100 W applications with minimal external components.

FAQ

What is the recommended external capacitor value for the TOVL pin to achieve standard overload delay?

A 100 nF ceramic capacitor on TOVL yields an 8 ms overload delay, matching the typical specification in the datasheet. This value ensures reliable short-circuit protection without nuisance tripping during transient overloads. Use X7R dielectric with 16 V rating and place close to the pin with short traces to minimize noise coupling.

Can VIPER53SP13TR operate without an optocoupler in all applications?

Yes-it supports primary-side regulation using the internal error amplifier and auxiliary winding feedback, eliminating the optocoupler in applications where ±5% output accuracy suffices. For tighter regulation (±1%), secondary feedback with TL431 and optocoupler is required, leveraging the COMP pin's compatibility with external current injection.

How does the adaptive blanking time improve system reliability?

The blanking time switches between 150 ns (COMP > 1 V) and 400 ns (COMP ≤ 1 V) to suppress false turn-off caused by transformer leakage spikes or diode reverse recovery. This prevents erratic switching during light loads or transient events, maintaining stable regulation and extending MOSFET lifetime without compromising dynamic response.

What thermal interface is required to achieve the rated 40 W output in PowerSO-10™ package?

To sustain 40 W output, the exposed drain tab must be soldered to ≥50 mm² of 35 µm-thick copper on a single-sided FR4 board, per ST's thermal data. For higher reliability, add thermal vias under the tab connecting to inner/ground planes. Without this, derating to ~25 W is necessary to maintain T_j < 125 °C.