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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > AC DC Converters, Offline Switches

STMicroelectronics VIPER50-22-E

Name: VIPER50-22-E
Brand: STMicroelectronics
SKU: VIPER50-22-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VIPER50-22-E

Manufacturer:: STMicroelectronics

Category:: AC DC Converters, Offline Switches

Package:: Pentawatt-5 HV (Bent and Staggered Leads)

Datasheet:: VIPER50-22-E.pdf

Description:: IC OFFLIN CONV FLBACK 5PENTAWATT

Quantity:: RFQ Add To RFQ list

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Product details

Overview

VIPER50-22-E from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 620 V/1.5 A vertical power MOSFET, designed for primary-side switching in offline SMPS. It delivers up to 50 W in single-range configurations, features adjustable 90–110 kHz switching frequency, internal 13 V VDD regulation, and burst-mode operation enabling <1 W standby consumption per Blue Angel norm.

For engineers reviewing the VIPER50-22-E datasheet, VIPER50-22-E pinout, VIPER50-22-E application, or VIPER50-22-E equivalent, key selection criteria include its integrated HV start-up current source, programmable peak current limit (1.5–2.7 A), thermal shutdown at 140–170 °C, and PENTAWATT HV (022Y) package compatibility with snubberless flyback designs.

Technical Context

The VIPER50-22-E implements current-mode control using a transconductance error amplifier (G_m = 1.1–1.9 mA/V) and a dedicated current-sense comparator with 250 ns blanking time and 350–1200 ns minimum on-time. Its oscillator supports external RT/CT programming and synchronization, with frequency stability maintained across VDD = 9–15 V.

Operation includes automatic transition to burst mode below ~1 W load via COMP-pin threshold detection (V_COMPth = 0.5 V), UVLO hysteresis (3 V), and integrated overtemperature protection (T_tsd = 140–170 °C, hysteresis = 40 °C). The device uses VIPower M0 technology to co-integrate logic, protection, and power switch on one die.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	620 V - Withstands full mains rectified voltage (e.g., 325 V DC from 230 V AC) with margin for surges and ringing.
I_D (peak)	1.5–2.7 A - Programmable current limit sets maximum primary peak current, defining max output power and short-circuit robustness.
F_SW	90–110 kHz - Adjustable via RT/CT network; enables optimized transformer size vs. EMI trade-off in flyback converters.
R_DS(on)	5 Ω (typ.) - On-resistance determines conduction loss at 1 A; impacts thermal design and efficiency at full load.
V_DD regulation	13 V ±2% - Internally trimmed reference stabilizes control supply; enables primary or secondary regulation without external LDO.
Standby power	<1 W - Achieved via burst mode and low I_DD0 (12–16 mA), meeting Blue Angel eco-label requirements.
T_J shutdown	140–170 °C - Thermal latch protects against sustained overload or poor heatsinking; hysteresis prevents oscillation near trip point.

Pinout & Package

The VIPER50-22-E is housed in a PENTAWATT HV (022Y) package - a 5-pin, high-voltage, surface-mount package with extended creepage and isolation for mains-connected applications.

Pin/Terminal	Circuit Role	Design Meaning
DRAIN	Integrated Power MOSFET Drain	High-side switching node; carries full primary current and withstands 620 V; supplies internal HV start-up current during boot-up.
SOURCE	Power MOSFET Source	Primary-side ground reference; connects to source of internal FET and serves as current-sense return path for peak current limiting.
VDD	Control Supply Input	Low-voltage rail (8–15 V) for logic and gate drive; regulated internally to 13 V; triggers UVLO reset at 11–12 V and shutdown at 7.5–9 V.
COMP	Error Amplifier Output	Transconductance amplifier output (0–5 V range); sets peak current limit; drops below 0.5 V to force zero-duty-cycle burst mode.
OSC	Oscillator Timing Input	Connects to external RT/CT network to set switching frequency; accepts external sync signal for multi-converter synchronization.

Key Features

Feature	Design Value
Integrated HV Start-up Current Source	Eliminates external high-voltage resistor network; draws bias directly from DRAIN pin during startup, reducing component count and no-load losses.
Burst Mode Standby Operation	Automatically engages when output power falls below ~1 W; maintains regulation via intermittent switching cycles, achieving sub-1 W system-level standby consumption.
Current-Mode Control with Blanking	250 ns current-sense blanking prevents false turn-off from transformer leakage spikes or diode reverse recovery noise, improving reliability in compact layouts.
Thermal Shutdown with Hysteresis	Shuts down at 140–170 °C junction temperature and remains off until cooled by ≥40 °C, preventing thermal runaway during sustained overload or poor ventilation.
Adjustable Peak Current Limit	Set via COMP pin voltage (0.5 V offset + 1.4–2.6 V/A gain); allows precise tuning of max power delivery and fault current without external sense resistors.

Applications

AC-DC Adapters

Smart Home Power Supplies

Use Scenario: 12 V/2 A wall adapter for IoT sensors operating from universal AC input (90–264 V AC).

IC Role / Device Role / Timing Role: Primary-side PWM controller and power switch; regulates output via optocoupler feedback to COMP pin; provides fixed-frequency current-mode timing.

Use Value: Enables compact, snubberless 25 W design with <1 W no-load consumption-meeting EU CoC Tier 2 and Blue Angel requirements without auxiliary controllers.

Use Scenario: Low-power auxiliary supply (5 V/0.5 A) inside smart lighting hubs with standby wake-on-RF capability.

IC Role / Device Role / Timing Role: Standby power controller; operates in burst mode during idle; transitions seamlessly to full PWM on load demand; manages VDD self-bias from auxiliary winding.

Use Value: Delivers stable 5 V rail with <300 mW standby draw, enabling always-on RF receivers while maintaining EN 55032 Class B EMI compliance.

Industrial Control PSUs

White Goods Auxiliary Supplies

Use Scenario: 24 V/1 A isolated supply for PLC I/O modules in factory automation cabinets.

IC Role / Device Role / Timing Role: Primary-side regulated flyback controller; uses primary-side sensing with VDD regulation feedback; handles line transients up to 4 kV ESD.

Use Value: Provides reinforced isolation and 620 V breakdown margin for 300 V DC bus environments; eliminates optocoupler aging concerns in long-life industrial deployments.

Use Scenario: 12 V/0.3 A standby supply in refrigerator mainboard, powering microcontroller and display during door-open events.

IC Role / Device Role / Timing Role: Always-on auxiliary controller; leverages internal 13 V VDD regulator and burst mode to sustain operation across wide input (85–265 V AC) and temperature (-25 to +70 °C).

Use Value: Ensures reliable cold-start performance and <0.8 W standby draw-critical for energy labeling (EU Energy Label A+++) and compressor cycling stability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICE2QS03G	Fixed 65 kHz frequency; no integrated MOSFET; requires external 650 V FET and startup resistor.	Lacks burst mode and HV start-up; needs additional components for <1 W standby.	Preferred where cost-sensitive BOM allows discrete FET and tighter EMI control is needed via fixed frequency.
LNK304P	700 V integrated switch; 66 kHz fixed frequency; no OSC pin; smaller SO-8 package.	No frequency adjustment or external sync; lower max power (~15 W); simpler compensation but less flexible loop design.	Selected for space-constrained, low-power (<15 W) adapters where design simplicity outweighs programmability.

Compared with ICE2QS03G and LNK304P, the VIPER50-22-E uniquely combines adjustable frequency, integrated HV start-up, and guaranteed burst-mode sub-1 W operation in a single PENTAWATT HV package-making it optimal for mid-power (25–50 W), eco-compliant, snubberless flyback designs requiring minimal external components.

Availability

VIPER50-22-E is available at Aetrix Electronics and suitable for AC-DC adapters, smart home power supplies, industrial control PSUs, and white goods auxiliary supplies requiring stable component supply and long-term lifecycle support.

Supply support for VIPER50-22-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 series targets highly integrated, cost-optimized AC-DC conversion-designed specifically for offline SMPS up to 50 W, emphasizing reduced external component count, regulatory compliance (Blue Angel, CoC), and robustness in unregulated mains environments.

FAQ

What is the maximum continuous output power achievable with VIPER50-22-E?

The VIPER50-22-E supports up to 25 W under universal input (90–264 V AC) and up to 50 W in single-range (e.g., 230 V AC only) or doubler configurations. Real-world output depends on transformer design, cooling, and layout; thermal derating applies above 70 °C ambient due to R_thJC = 1.9 °C/W.

Can VIPER50-22-E operate without an optocoupler?

Yes-it supports primary-side regulation using VDD as feedback, leveraging its internal 13 V reference. In this mode, output voltage is stabilized by controlling auxiliary winding turns ratio to maintain VDD at 13 V; no optocoupler or secondary-side TL431 is required, reducing BOM cost and improving reliability.

How does the burst mode function trigger and recover?

Burst mode activates when COMP pin voltage falls below 0.5 V-indicating insufficient load to sustain regulation. This forces zero-duty-cycle shutdown until VDD recovers to ≥11 V (UVLO reset threshold), at which point normal PWM resumes. The cycle repeats autonomously, producing low-frequency output ripple (<10 Hz) with average input power <1 W.

Is the PENTAWATT HV (022Y) package RoHS compliant and lead-free?

Yes-the VIPER50-22-E in PENTAWATT HV (022Y) packaging is RoHS compliant and lead-free per STMicroelectronics' official product change notices (PCN 12-0147 and 15-0022), with matte tin (Sn) termination and halogen-free molding compound meeting IEC 61249-2-21 standards.

VIPER50-22-E Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: VIPER™

Package/Case:: Pentawatt-5 HV (Bent and Staggered Leads)

Packaging:: Tube

Product Status:: Obsolete

Output Isolation:: Isolated

Internal Switch(s):: Yes

Voltage - Breakdown:: 620V

Topology:: Flyback

Voltage - Start Up:: 11 V

Voltage - Supply (Vcc/Vdd):: 8V ~ 15V

Duty Cycle:: -

Frequency - Switching:: Up to 200kHz

Power (Watts):: 50 W

Fault Protection:: Current Limiting, Over Temperature

Control Features:: Frequency Control, Soft Start, Sync

Operating Temperature:: -

Grade:: -

Qualification:: -

Supplier Device Package:: 5-PENTAWATT

Mounting Type:: Surface Mount

VIPER50-22-E FAQ

1.How can I place an order for VIPER50-22-E through Aetrix?

Please submit a Request for Quotation (RFQ) for VIPER50-22-E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for VIPER50-22-E reliable?

The price and inventory of VIPER50-22-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER50-22-E is usually 5 days.

3.What payment methods are accepted for VIPER50-22-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER50-22-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VIPER50-22-E?

VIPER50-22-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VIPER50-22-E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for VIPER50-22-E?

For technical support, including VIPER50-22-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER50-22-E requirements.

6.How does Aetrix verify that VIPER50-22-E is sourced from the original manufacturer or authorized distributors?

All VIPER50-22-E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VIPER50-22-E meets industry standards.

7.What is the process for return or replacement of VIPER50-22-E?

All VIPER50-22-E units undergo pre-shipment inspection (PSI). If there is an issue with VIPER50-22-E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The VIPER50-22-E part is unused and in its original packaging.

Return procedure for VIPER50-22-E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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