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STMicroelectronics VIPER50ASP
- Part No.:
- VIPER50ASP
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- PowerSO-10 Exposed Bottom Pad
- Datasheet:
-
VIPER50ASP.pdf
- Description:
- IC OFFLINE SW FLBACK 10POWERSO
- Quantity:
- Payment:
- Shipping:
Inventory:3,765
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Product details
Overview
VIPER50ASP from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 700V avalanche-rugged vertical power MOSFET (RDS(on) = 5.7 Ω, ID = 1.5 A), designed for primary-side regulation in offline SMPS. It delivers up to 50W output in single-range configurations, supports adjustable switching frequency up to 200 kHz, features automatic burst mode for <1W standby consumption (Blue Angel compliant), and includes internal start-up supply, UVLO with hysteresis, and overtemperature protection.
For engineers reviewing the VIPER50ASP datasheet, VIPER50ASP pinout, VIPER50ASP application, or VIPER50ASP equivalent, key selection considerations include its integrated 700V MOSFET capability, programmable peak current limit (1.5–2.7 A), VDD regulation at 13 V ±2%, soft-start/shutdown control via COMP pin, and compatibility with both primary- and secondary-side feedback topologies without external bias winding.
Technical Context
The VIPER50ASP implements current-mode control using a SenseFET-based primary current sensing path with 250 ns blanking time and 250 ns propagation delay to ensure stable operation under transient load and line conditions. Its transconductance error amplifier (Gm = 1.1–1.9 mA/V) interfaces directly with optocoupler feedback or primary-side resistive dividers, enabling precise regulation without auxiliary windings.
Burst mode is triggered automatically when VCOMP falls below 0.5 V, forcing zero-duty-cycle shutdown until VDD recovers to 11 V and VCOMP exceeds threshold - enabling sub-1W no-load consumption. The integrated 700V MOSFET eliminates external HV startup components and supports snubberless operation in low-power flyback designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 700 V - Enables direct connection to universal AC mains (85–265 VAC) without external HV clamping |
| RDS(on) | 5.7 Ω @ Tj = 100°C - Sets conduction loss ceiling for ≤50W continuous output in single-range flyback |
| FSW | Adjustable 90–110 kHz (Rt/Ct-set) - Balances EMI, transformer size, and efficiency in compact adapters |
| IDPEAK | 1.5–2.7 A - Programmable current limit defines maximum primary energy per cycle and short-circuit robustness |
| VDD Reg | 13.0 V ±2% - Internal Zener reference enables stable bias for control circuitry and optocoupler drive |
| PSTBY | <1 W total system consumption - Achieved via automatic burst mode; meets Blue Angel eco-label requirement |
| TSD | 140–170°C with 40°C hysteresis - Thermal latch protects against sustained overload or poor heatsinking |
Pinout & Package
Package: PowerSO-10™ (PENTAWATT HV, 022Y footprint), surface-mount, thermally enhanced with exposed drain pad for PCB heat sinking (Rthj-case = 1.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRAIN | Integrated MOSFET drain | High-voltage node connected to transformer primary; supplies internal start-up current during power-on |
| SOURCE | MOSFET source / power ground | Primary-side common return; used as current sense reference for internal peak current detection |
| VDD | Control supply & error amp reference | Provides 13 V regulated bias; dual-role input for primary regulation (internal ref) or secondary regulation (external voltage) |
| COMP | Error amplifier output & shutdown control | Transconductance output (0.2–4.5 V swing); falling below 0.5 V forces burst-mode shutdown |
| OSC | Oscillator timing & sync input | Accepts Rt/Ct network for frequency setting; also accepts external clock signal for synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 700V Power MOSFET | Eliminates external HV switch and startup resistor; enables snubberless operation in ≤50W flyback converters |
| Current-Mode Control with Blanking | 250 ns blanking + 250 ns delay prevents false triggering from transformer leakage spikes or diode reverse recovery |
| Automatic Burst Mode | Zero-duty-cycle shutdown below 0.5 V on COMP pin reduces no-load input power to <1 W without external circuitry |
| Internal Start-Up Current Source | Biases VDD capacitor directly from DRAIN pin; enables self-starting without auxiliary winding or external HV supply |
| Thermal Shutdown with Hysteresis | Latches off at 140–170°C and resets only after 40°C cooldown - prevents thermal cycling during overload |
Applications
| AC/DC Wall Adapters | Set-Top Box Standby Supplies |
|---|---|
|
Use Scenario: 5–12 V, 1–3 A universal-input adapter for consumer electronics. IC Role / Device Role / Timing Role: Primary-side PWM controller and power switch in discontinuous conduction mode (DCM) flyback topology. Use Value: Integrated 700V MOSFET and burst mode reduce BOM count by ≥30% and meet <1W no-load requirement without auxiliary winding. |
Use Scenario: Dual-output (5 V/3.3 V) standby rail powering microcontroller and memory in set-top boxes. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing both active and ultra-low-power standby states. Use Value: Automatic transition between normal PWM and burst mode ensures <1W total system standby power while maintaining tight output regulation. |
| Smart Home Hub Power Supplies | Industrial Sensor Node SMPS |
|
Use Scenario: Compact 5 V/2 A isolated supply for Wi-Fi/BLE gateways with wide ambient temperature range. IC Role / Device Role / Timing Role: High-reliability primary-side controller with integrated avalanche ruggedness and thermal protection. Use Value: 700V rating and 170°C thermal shutdown enable robust operation across 85–265 VAC inputs and -40°C to +85°C ambient. |
Use Scenario: 3.3 V/0.5 A isolated supply for battery-backed industrial sensors requiring long-term reliability. IC Role / Device Role / Timing Role: Low-component-count flyback controller supporting primary regulation to eliminate optocoupler aging concerns. Use Value: Internal 13 V VDD regulator and precise COMP pin interface allow stable primary-side feedback with ±2% output tolerance. |
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 | 650V MOSFET, fixed 65 kHz frequency, no burst mode, requires external startup resistor | Lacks automatic <1W standby; needs auxiliary winding or external HV supply for start-up | Preferred where cost sensitivity outweighs eco-label compliance and board space is less constrained |
| LNK306P | 700V MOSFET, 66 kHz, integrated auto-restart, but no programmable current limit or VDD regulation | No internal 13 V reference; relies on external Zener for VDD clamp; lower peak current (0.48 A) | Suitable for ≤10W applications where burst mode suffices but precise current limiting is unnecessary |
Compared with ICE2QS03G and LNK306P, VIPER50ASP uniquely combines 700V ruggedness, programmable current limit, internal VDD regulation, and automatic burst mode - enabling compact, Blue Angel-compliant 50W designs without auxiliary windings or external HV components.
Availability
VIPER50ASP is available at Aetrix Electronics and suitable for AC/DC wall adapters, set-top box standby supplies, smart home hub power supplies, and industrial sensor node SMPS requiring stable component supply and long-lifecycle support.
Supply support for VIPER50ASP 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, analog, MCU, and automotive ICs with strong manufacturing control and AEC-Q100 qualification capabilities.
VIPER50ASP belongs to ST's VIPer™ family of integrated HV converters, engineered specifically for cost-sensitive, high-efficiency offline SMPS in consumer and industrial applications where integration, reliability, and eco-compliance are critical.
FAQ
What is the maximum continuous output power achievable with VIPER50ASP?
VIPER50ASP supports up to 50W in single-range AC input (230 VAC) flyback configurations using doubler rectification, and 25W in universal-input (85–265 VAC) wide-range operation. Actual power depends on transformer design, cooling, and layout - the 700V/1.5A MOSFET and 5.7 Ω RDS(on) define the thermal and conduction limits under continuous load.
Can VIPER50ASP operate without an auxiliary winding on the transformer?
Yes. VIPER50ASP integrates a high-voltage start-up current source referenced to the DRAIN pin, allowing direct charging of the VDD capacitor at power-on. Once running, it can be powered entirely from primary-side regulation (using internal 13 V reference) - eliminating need for auxiliary winding in many designs.
How does burst mode activation work, and what triggers exit from it?
Burst mode activates when VCOMP drops below 0.5 V, forcing zero-duty-cycle shutdown. Exit occurs when VDD rises above 11 V (UVLO reset threshold) and VCOMP crosses 0.5 V again - typically driven by decay of output capacitors causing VDD to sag and recover cyclically. This yields low-frequency ripple but maintains regulation within ±5%.
Is VIPER50ASP still in active production, or is it obsolete?
VIPER50ASP is marked "Obsolete Product(s)" in the official ST datasheet revision (May 2003), indicating end-of-life status. However, Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for drop-in replacements and redesign guidance for new projects.
VIPER50ASP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPER™
- Package/Case:
- PowerSO-10 Exposed Bottom Pad
- 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:
- 10-PowerSO
- Mounting Type:
- Surface Mount
VIPER50ASP FAQ
1.How can I place an order for VIPER50ASP through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER50ASP 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 VIPER50ASP reliable?
The price and inventory of VIPER50ASP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER50ASP is usually 5 days.
3.What payment methods are accepted for VIPER50ASP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER50ASP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER50ASP?
VIPER50ASP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER50ASP 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 VIPER50ASP?
For technical support, including VIPER50ASP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER50ASP requirements.
6.How does Aetrix verify that VIPER50ASP is sourced from the original manufacturer or authorized distributors?
All VIPER50ASP 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 VIPER50ASP meets industry standards.
7.What is the process for return or replacement of VIPER50ASP?
All VIPER50ASP units undergo pre-shipment inspection (PSI). If there is an issue with VIPER50ASP, 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 VIPER50ASP part is unused and in its original packaging.
Return procedure for VIPER50ASP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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