STMicroelectronics VIPER50SP13TR

Overview

VIPER50SP13TR from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 620 V/1.5 A avalanche-rugged vertical power MOSFET, designed for primary-side switching in offline SMPS. It delivers up to 25 W in universal-input AC-DC adapters and auxiliary supplies, features adjustable 90–110 kHz switching frequency, internal 13 V VDD regulation, and burst-mode operation enabling <1 W standby power per Blue Angel norm.

For engineers reviewing the VIPER50SP13TR datasheet, VIPER50SP13TR pinout, VIPER50SP13TR application, or VIPER50SP13TR equivalent, key selection criteria include its integrated start-up current source, programmable peak current limit (1.5–2.7 A), thermal shutdown at 140–170 °C, and compatibility with both primary- and secondary-side regulation topologies using optocoupler feedback.

Technical Context

The VIPER50SP13TR implements a fixed-frequency current-mode control architecture with dual-loop regulation: an inner current-sense loop compares sensed drain current against COMP voltage, while the outer transconductance error amplifier (Gm = 1.1–1.9 mA/V) adjusts COMP to regulate output voltage. Its oscillator uses external Rt–Ct network (e.g., 8.2 kΩ + 2.4 nF) for precise frequency setting independent of VDD variation (9–15 V).

Start-up is enabled by an integrated high-voltage current source tied to the DRAIN pin, delivering ~2 mA to charge the VDD capacitor until UVLO threshold (VDDon = 11–12 V) is reached; shutdown occurs below VDDoff = 7.5–9 V with 2.4–3 V hysteresis. Protection includes overtemperature latch (Ttsd = 140–170 °C, Thyst = 40 °C), blanking time (250–360 ns), and minimum on-time (350–1200 ns) to suppress noise-induced false triggering.

Key Specifications

Pinout & Package

Delivered in PowerSO-10™ (PENTAWATT HV) package - thermally enhanced 10-pin surface-mount housing with exposed drain pad for efficient heat dissipation (R_thj-case = 1.9 °C/W). Pin numbering follows top-view layout with pins 1–5 on left side and 6–10 on right side, matching JEDEC MO-220 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE2QS03G and LNK304P, VIPER50SP13TR offers higher integration (HV start-up + MOSFET), wider power range (25–50 W), and certified <1 W standby-making it optimal for compact, globally compliant AC-DC converters where component count and regulatory margin are critical.

Availability

VIPER50SP13TR is available at Aetrix Electronics and suitable for smartphone charger adapters, set-top box auxiliary supplies, industrial sensor power modules, and white goods control board supplies requiring stable component supply and long-term lifecycle support.

Supply support for VIPER50SP13TR 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.

VIPER™ is ST's proprietary family of high-voltage SMPS primary controllers built on VIPower M0 technology, engineered specifically for cost-sensitive, space-constrained offline power conversion with minimal external components.

FAQ

What is the maximum continuous output power achievable with VIPER50SP13TR in universal-input flyback topology?

VIPER50SP13TR supports up to 25 W in universal-input (85–265 V_AC) flyback configurations with standard PCB layout and convection cooling. With single-range input (230 V_AC) or doubler configuration, output can reach 50 W-confirmed by ST application note AN2359 using PowerSO-10™ thermal data (R_thj-amb = 60 °C/W) and 1.5 A peak current rating.

How does the internal start-up current source function, and what external capacitor value is recommended on VDD?

The DRAIN-pin-connected start-up current source delivers ~2 mA during initial power-up to charge the VDD capacitor until UVLO threshold (11–12 V) is reached. For typical 100 ms startup time and 14 mA operating current, ST recommends ≥4.7 µF/25 V ceramic or tantalum capacitor-calculated via C_VDD > I_DDt_SS/V_DDhyst, where V_DDhyst = 2.4–3 V ensures reliable hysteresis margin.

Can VIPER50SP13TR be used in primary-side regulation without optocoupler feedback?

Yes-VIPER50SP13TR supports primary-side regulation using auxiliary winding feedback connected to VDD. Its internal 13 V regulator maintains stable bias, and COMP pin acts as error amplifier output referenced to VDD. ST reference design DER-312 demonstrates ±5% output regulation at 12 V/1 A without optocoupler, leveraging transformer turns ratio and VDD clamping.

What protection mechanisms prevent false triggering during MOSFET turn-on transient?

VIPER50SP13TR incorporates a 250–360 ns blanking time after each MOSFET turn-on, plus 250 ns current-sense propagation delay, collectively suppressing noise from transformer leakage inductance and rectifier reverse recovery. This prevents premature PWM termination-verified in Figure 4 waveforms and specified in "td" and "tb" parameters of the datasheet.