STMicroelectronics VIPER53ESPTR-E

Overview

VIPER53ESPTR-E from STMicroelectronics is a high-voltage offline primary switch IC integrating an enhanced current-mode PWM controller and a 620 V MDMesh™ Power MOSFET in a PowerSO-10 package. It delivers up to 40 W at universal input (85–265 VAC) or 65 W at European line (195–265 VAC), features adjustable peak current limiting (2 A typ), 100 kHz oscillator frequency (±5%), and built-in burst-mode standby compliant with Blue Angel (<0.5 W no-load power). It is used in compact AC/DC adapters and auxiliary power supplies for industrial controls and smart home devices.

For engineers reviewing the VIPER53ESPTR-E datasheet, VIPER53ESPTR-E pinout, VIPER53ESPTR-E application, or VIPER53ESPTR-E equivalent, key selection criteria include its integrated HV start-up current source (−12 mA), undervoltage lockout hysteresis (3.1 V), thermal shutdown threshold (160 °C), and COMP pin dynamic range (0.5–4.5 V) for optocoupler-based secondary regulation.

Technical Context

The VIPER53ESPTR-E implements a current-mode topology with cycle-by-cycle peak drain current sensing via internal SenseFET and voltage conversion at the COMP pin (HCOMP = 2 V/A typ). Its inner loop regulates primary current using a blanking time that switches between 150 ns (VCOMP > 1 V) and 400 ns (VCOMP ≤ 1 V), enabling stable operation down to ultra-light loads.

Standby mode is triggered automatically when COMP falls below 0.5 V, forcing burst-mode operation with variable pulse density-no fixed frequency-while maintaining output regulation. Overvoltage protection activates at VDD = 18 V (trimmed), and overload response is delayed by an external TOVL capacitor (e.g., 100 nF yields 8 ms delay).

Key Specifications

Pinout & Package

Package: PowerSO-10 (exposed drain tab, surface-mount, thermally enhanced). Pin 1 = VDD, Pin 2 = TOVL, Pin 3 = NC, Pin 4 = NC, Pin 5 = NC, Pin 6 = OSC, Pin 7 = COMP, Pin 8 = NC, Pin 9 = NC, Pin 10 = SOURCE; DRAIN connected internally to exposed tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE3B0565J and LNK364PG, VIPER53ESPTR-E uniquely combines Blue Angel-compliant standby, precise COMP-based current programming, and dual-blanking-time architecture-enabling tighter light-load regulation and simpler secondary feedback design in space-constrained adapters.

Availability

VIPER53ESPTR-E is available at Aetrix Electronics and suitable for industrial PLC auxiliary supplies, smart thermostat AC/DC adapters, and IoT gateway power modules requiring stable component supply, long-term lifecycle support, and regulatory-compliant standby performance.

Supply support for VIPER53ESPTR-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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The VIPer™ family targets highly integrated, low-component-count offline SMPS controllers-designed specifically for cost-sensitive, space-constrained AC/DC converters needing robust protection and regulatory compliance.

FAQ

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

A minimum 8 nF ceramic capacitor must be placed directly at the COMP pin to stabilize the internal current source and prevent oscillation. ST recommends 10 nF as standard; values below 8 nF risk instability in regulation loop response and may cause erratic burst-mode transitions or audible noise under light load.

Can VIPER53ESPTR-E operate without an optocoupler in the feedback path?

No-VIPER53ESPTR-E requires secondary-side feedback via optocoupler-connected COMP pin for accurate regulation. Its COMP pin is designed exclusively for current-mode error amplification with external TL431 or zener-based networks; primary-sensing topologies like those in LinkSwitch devices are not supported.

How does the TOVL capacitor affect overload response time?

A 100 nF capacitor on TOVL yields an 8 ms delay between COMP exceeding 4.35 V and device shutdown, per Figure 7 in the datasheet. Larger values increase delay linearly (e.g., 220 nF → ~17.6 ms); smaller values reduce delay but risk nuisance tripping during transient overloads such as motor startup surges.

Is the DRAIN pin electrically isolated from the PowerSO-10 package tab?

No-the DRAIN pin is internally bonded to the exposed copper tab of the PowerSO-10 package. This tab must be connected to the primary-side high-voltage node (e.g., rectified DC bus) and cannot serve as thermal pad to system ground; isolation is maintained solely through PCB layout and transformer barrier.