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

STMicroelectronics VIPER50A(022Y)

Name: VIPER50A(022Y)
Brand: STMicroelectronics
SKU: VIPER50A(022Y)
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VIPER50A(022Y)

Manufacturer:: STMicroelectronics

Category:: AC DC Converters, Offline Switches

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

Datasheet:: VIPER50A(022Y).pdf

Description:: IC OFFLIN CONV FLBACK 5PENTAWATT

Quantity:: RFQ Add To RFQ list

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Inventory:2,722

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Product details

Overview

VIPER50A(022Y) from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 700V avalanche-rugged vertical power MOSFET, designed for primary-side SMPS control in off-line AC-DC converters. It delivers up to 50W output in single-range configurations, features adjustable switching frequency up to 200 kHz, internal start-up supply, and automatic burst mode for <1W standby consumption per Blue Angel norm.

For engineers reviewing the VIPER50A(022Y) datasheet, VIPER50A(022Y) pinout, VIPER50A(022Y) application, or VIPER50A(022Y) equivalent, key selection criteria include its 700V drain-source rating, 5.7Ω R_DS(on) at T_j=100°C, 1.5A peak current limit, integrated UVLO with 3V hysteresis, and PowerSO-10™ (022Y) package thermal performance (R_thj-case = 1.9°C/W).

Technical Context

The VIPER50A(022Y) implements current-mode control using a SenseFET-based primary current sensing path with 250 ns blanking time and 1.4–2.6 V/A transconductance gain for COMP-to-ID_PEAK conversion. Its oscillator supports external Rt-Ct programming and synchronization via the OSC pin, with frequency stability maintained across VDD = 9–15 V.

It integrates a transconductance error amplifier (G_m = 1.1–1.9 mA/V) referenced to VDD, enabling both primary and secondary regulation topologies - primary via internal 13V reference, secondary via optocoupler-connected COMP pin - with shutdown triggered at V_COMP < 0.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	700 V - Withstands line surges up to 700V without external clamping in snubberless operation.
R_DS(on)	5.7 Ω @ T_j = 100°C - Enables efficient 50W single-range power delivery with low conduction loss.
I_DPEAK	1.5–2.7 A - Programmable peak current limit ensures robust short-circuit protection and power scaling.
F_SW	90–110 kHz (typ.) - Adjustable via external Rt-Ct network; stable over VDD 9–15 V for reliable EMI control.
T_SD	140–170°C - Thermal shutdown with 40°C hysteresis prevents latch-up during overload or poor heatsinking.
I_DD0	12–16 mA @ F_SW = 0 kHz - Low quiescent supply current enables efficient light-load operation.
V_DDON/V_DDOFF	11–12 V / 7.5–9 V - UVLO with 2.4–3V hysteresis ensures clean start-up and brown-out recovery.
P_tot	60 W @ T_C = 25°C - High power dissipation capability supports compact heatsink designs in PowerSO-10™.

Pinout & Package

Delivered in PowerSO-10™ (022Y) package - a 10-pin, surface-mount, high-voltage thermally enhanced package with exposed die pad for low R_thj-case (1.9°C/W) and creepage >4mm between HV and LV pins.

Pin/Terminal	Circuit Role	Design Meaning
DRAIN	Power MOSFET drain terminal	Connects to rectified AC line; supplies internal start-up current; handles unclamped avalanche energy (E_AR = 30 mJ).
SOURCE	Power MOSFET source terminal	Primary-side ground reference; current sense node for internal peak current detection.
VDD	Control circuit supply & error amp reference	Provides 13V-regulated bias; enables primary/secondary regulation; activates UVLO hysteresis (11V on / 8V off).
COMP	Error amplifier output & shutdown input	Transconductance output (1.5 mA/V); shuts down PWM when voltage drops below 0.5 V for burst mode or fault protection.
OSC	Oscillator timing & sync input	Accepts external Rt-Ct network for frequency setting; supports synchronization from external clock source.

Key Features

Feature	Design Value
Integrated 700V Power MOSFET	Eliminates external HV switch and gate driver, reducing BOM count by ~50% vs discrete solutions.
Automatic Burst Mode	Enables <1W system standby power without auxiliary circuitry, meeting Blue Angel (RAL-UZ 33) requirements.
Internal Start-Up Current Source	Draws bias directly from DRAIN pin, removing need for high-voltage start-up resistor and associated losses.
Programmable Peak Current Limit	Adjustable via COMP pin voltage (1.4–2.6 V/A gain), allowing precise output power scaling and fault threshold tuning.
Avalanche-Rugged Architecture	Rated for repetitive 1A avalanche current and 30 mJ single-pulse energy, enabling snubberless operation in low-power flyback designs.

Applications

Smartphone Charger Adapter

Set-Top Box Standby Supply

Use Scenario: Compact 5V/2A USB charging adapter operating from universal AC input (85–265 VAC).

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

Use Value: Achieves 50W peak output with single VIPER50A(022Y), eliminating external MOSFET and driver while maintaining <300 mW no-load consumption.

Use Scenario: Always-on 3.3V/0.5A auxiliary rail powering microcontroller and IR receiver in digital TV receivers.

IC Role / Device Role / Timing Role: Standby-mode SMPS controller; enters automatic burst mode under light load to minimize idle power.

Use Value: Meets <1W total system standby requirement (Blue Angel) without auxiliary winding or external burst-control IC.

LED Driver for Smart Bulbs

Industrial Sensor Power Module

Use Scenario: Dimmable 12V/0.3A constant-voltage LED driver embedded in retrofit smart bulbs.

IC Role / Device Role / Timing Role: Primary-side regulated flyback controller; uses primary-sensing configuration with VDD as feedback node.

Use Value: Reduces component count by omitting optocoupler and TL431, lowering BOM cost and improving long-term reliability.

Use Scenario: Isolated 5V/0.2A power supply for RS-485 nodes in factory automation systems with wide ambient temperature range.

IC Role / Device Role / Timing Role: Robust primary-side controller with thermal shutdown (140–170°C) and 700V V_DSS for surge immunity.

Use Value: Sustains operation under 85°C ambient with derated output, leveraging PowerSO-10™'s 1.9°C/W R_thj-case for passive cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
VIPER53A (STMicroelectronics)	Higher 800V V_DSS, lower 4.5Ω R_DS(on), same PowerSO-10™ package	Better suited for 277VAC industrial lighting; improved efficiency at full load	Select when higher surge immunity or >50W continuous output is required.
ICE3B0565J (Infineon)	650V V_DSS, fixed 65kHz frequency, DIP-8 package, no integrated start-up current source	Requires external HV start-up resistor; less suitable for ultra-low standby designs	Select when legacy DIP layout compatibility or lower unit cost outweighs standby power penalty.

Compared with VIPER50A(022Y), VIPER53A offers higher voltage margin and lower conduction loss but shares identical control architecture and pinout, whereas ICE3B0565J requires additional components for start-up and lacks burst-mode optimization, increasing no-load power by ~300 mW.

Availability

VIPER50A(022Y) is available at Aetrix Electronics and suitable for smartphone charger adapters, set-top box standby supplies, smart LED drivers, and industrial sensor power modules requiring stable component supply and long-lifecycle support.

Supply support for VIPER50A(022Y) 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, MCU, power, and MEMS products for automotive, industrial, and consumer markets.

The VIPer™ family targets highly integrated, cost-optimized AC-DC conversion for sub-75W applications, emphasizing reduced external component count, low standby power, and ruggedness in compact packages like PowerSO-10™.

FAQ

What is the maximum recommended primary inductance for stable burst mode operation?

The minimum controllable current I_STBY is determined by t_b + t_d ≈ 500 ns, and burst threshold power P_STBY = ½·L_P·I_STBY²·F_SW. For reliable transition at 100 kHz, L_P should be ≤ 1.2 mH when I_STBY ≥ 15 mA - verified in Figure 12 test conditions and application note AN2349.

Can VIPER50A(022Y) operate without an auxiliary winding?

Yes - its integrated high-voltage start-up current source draws bias directly from the DRAIN pin, enabling operation with only main transformer winding. However, auxiliary winding is required for sustained VDD regulation above start-up; omission limits duty cycle and risks UVLO cycling under load.

How is thermal protection implemented, and does it latch?

Thermal shutdown triggers at 140–170°C junction temperature with 40°C hysteresis. It is non-latching: once T_j falls below T_tsd – 40°C, normal operation resumes automatically - confirmed in Electrical Characteristics Table (T_tsd, Thyst) and Figure 8 waveform.

What external components are mandatory for basic operation?

Mandatory components: (1) Rt-Ct network on OSC pin for frequency setting, (2) capacitor ≥4.7 µF on VDD pin for UVLO hold-up, (3) RC compensation network from COMP to SOURCE for loop stability. DRAIN connects directly to rectified line; no gate resistor or bootstrap diode needed due to integration.

VIPER50A(022Y) 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:: 700V

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

VIPER50A(022Y) FAQ

1.How can I place an order for VIPER50A(022Y) through Aetrix?

Please submit a Request for Quotation (RFQ) for VIPER50A(022Y) 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 VIPER50A(022Y) reliable?

The price and inventory of VIPER50A(022Y) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER50A(022Y) is usually 5 days.

3.What payment methods are accepted for VIPER50A(022Y)?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER50A(022Y) transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VIPER50A(022Y)?

VIPER50A(022Y) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VIPER50A(022Y) 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 VIPER50A(022Y)?

For technical support, including VIPER50A(022Y) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER50A(022Y) requirements.

6.How does Aetrix verify that VIPER50A(022Y) is sourced from the original manufacturer or authorized distributors?

All VIPER50A(022Y) 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 VIPER50A(022Y) meets industry standards.

7.What is the process for return or replacement of VIPER50A(022Y)?

All VIPER50A(022Y) units undergo pre-shipment inspection (PSI). If there is an issue with VIPER50A(022Y), 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 VIPER50A(022Y) part is unused and in its original packaging.

Return procedure for VIPER50A(022Y):

1.Submit a request within 90 days.

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

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