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STMicroelectronics VIPER22AS-E
- Part No.:
- VIPER22AS-E
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
VIPER22AS-E.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:911
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Product details
Overview
VIPER22AS-E from STMicroelectronics is a high-voltage, current-mode PWM controller integrated with a 730 V avalanche-rated power MOSFET in a single SO-8 package. It delivers up to 12 W output power from European mains (195–265 Vac), operates at a fixed 60 kHz switching frequency, supports 9–38 V VDD supply range, and provides overtemperature, overcurrent, and overvoltage protection with auto-restart-targeting off-line SMPS in battery charger adapters.
For engineers reviewing the VIPER22AS-E datasheet, VIPER22AS-E pinout, VIPER22AS-E application, or VIPER22AS-E equivalent, key selection criteria include its integrated HV start-up current source, FB pin current-sensing architecture (0–1 V effective range), burst-mode operation under light load, and HICCUP-mode overvoltage protection-critical for compact, cost-sensitive auxiliary and adapter supplies.
Technical Context
The device implements a current-mode control loop where peak drain current is directly regulated by feedback current into the FB pin, with gain GID = 560 A/A and internal blanking time of 500 ns to suppress switching noise. Its oscillator maintains ±10% frequency stability (54–66 kHz) across 0–100 °C and 9–35 V VDD.
Startup relies on an internal high-voltage current source connected to the DRAIN pin, charging the external VDD capacitor until VDD reaches 14.5 V (VDDon); shutdown occurs at 8 V (VDDoff) with 6.5 V hysteresis. Thermal protection triggers at 170 °C with 40 °C hysteresis, forcing auto-restart after cooldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 60 kHz ±10%; enables predictable EMI filtering and transformer design with minimal external timing components. |
| VDD Operating Range | 9 V to 38 V; accommodates wide auxiliary winding voltage variation and ensures stable operation across input line transients. |
| Drain-Source Voltage (BVDSS) | 730 V; supports direct connection to universal AC mains without external HV startup network or bulk capacitor derating. |
| Peak Current Limit (IDlim) | 0.7 A typical; sets maximum primary current to protect transformer and MOSFET during overload or short-circuit conditions. |
| FB Pin Current Sensitivity | 0–0.9 mA shutdown threshold; enables precise current-mode regulation via optocoupler feedback without external op-amps. |
| Thermal Shutdown Threshold | 170 °C with 40 °C hysteresis; prevents permanent junction damage while allowing automatic recovery after fault clearance. |
| Start-up Charging Current | −1 mA (sink) from DRAIN to VDD; eliminates need for external high-voltage resistor, reducing no-load power and component count. |
Pinout & Package
Package: SO-8 (ECOPACK® compliant, surface-mount, 1.75 mm height, 5.00 × 4.00 mm footprint).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRAIN (Pins 1, 2, 3, 4, 5, 6, 7) | Power MOSFET drain terminal and HV start-up current source input | Carries full primary-side switching current; also sources −1 mA start-up current to charge VDD capacitor from rectified AC input. |
| SOURCE (Pin 8) | MOSFET source and control circuit ground reference | Common return path for power and signal; connects to primary-side ground and FB current sink reference point. |
| VDD (Pin 7) | Control circuit supply and undervoltage lockout sense node | Powered by auxiliary winding; monitored by hysteresis comparator (VDDon = 14.5 V, VDDoff = 8 V) to enable/disable switching. |
| FB (Pin 6) | Current-mode feedback input | Accepts 0–0.9 mA current from optocoupler; regulates peak drain current linearly down to 85 mA before entering burst mode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 730 V Power MOSFET | Eliminates external HV switch and gate driver, reducing BOM count and PCB area in <12 W offline converters. |
| Current-Mode Feedback Architecture | FB pin senses current (not voltage), enabling inherent cycle-by-cycle current limiting and simplified secondary-side regulation via optocoupler. |
| Auto-Burst Mode at Light Load | Reduces standby power consumption below 85 mA peak drain current by skipping switching cycles-critical for Energy Star compliance. |
| HICCUP-Mode Overvoltage Protection | VDD overvoltage (≥42 V) triggers latched shutdown until VDD falls to 8 V, preventing sustained overvoltage stress on output capacitors. |
| Internal HV Start-up Current Source | −1 mA DRAIN-to-VDD current enables resistor-free startup, improving reliability and eliminating thermal drift of external bias networks. |
Applications
| Battery Charger Adapter | TV/Monitor Standby Supply |
|---|---|
|
Use Scenario: Compact wall-wart charger for smartphones and portable devices operating from 195–265 Vac mains. IC Role / Device Role / Timing Role: Primary-side SMPS controller and power switch delivering regulated 5 V/2 A output with constant-current/constant-voltage profile. Use Value: Integrated 730 V MOSFET and 60 kHz fixed-frequency operation allow transformer size reduction by >25% versus discrete solutions. |
Use Scenario: Low-power auxiliary supply powering microcontroller, IR receiver, and memory in TV standby mode. IC Role / Device Role / Timing Role: Off-line flyback controller providing isolated 3.3 V/100 mA output with <300 mW no-load consumption. Use Value: Burst-mode operation and 9 V VDD start threshold ensure <100 mW standby power, meeting EU CoC Tier 2 requirements. |
| Motor Control Auxiliary Supply | Industrial Sensor Interface PSU |
|
Use Scenario: Isolated 12 V/500 mA auxiliary rail powering gate drivers and logic in BLDC motor inverters. IC Role / Device Role / Timing Role: Primary-side controller regulating output under variable load and line conditions with fast transient response. Use Value: Wide 9–38 V VDD range tolerates auxiliary winding voltage sag during motor startup surges without dropout. |
Use Scenario: DIN-rail mounted sensor node requiring robust 5 V/200 mA isolated supply from 85–265 Vac industrial mains. IC Role / Device Role / Timing Role: Self-protected flyback controller delivering regulated output with built-in OVP, OTP, and OCP. Use Value: Auto-restart protection and 170 °C thermal shutdown prevent field failures due to ambient temperature rise or convection blockage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar offline SMPS controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE2QS03G | Fixed 65 kHz frequency; requires external HV start-up resistor; no integrated MOSFET (external 650 V FET needed). | Higher BOM count and layout complexity; better suited for designs requiring higher efficiency above 15 W. | Select when higher power (>15 W) or tighter frequency tolerance (<±3%) is required, and external FET selection is preferred. |
| LNK304P | 700 V integrated FET; 66 kHz frequency; uses frequency jittering for EMI reduction; no VDD hysteresis (single-threshold UVLO). | Lacks programmable burst mode; higher no-load consumption (~350 mW vs. ~200 mW for VIPER22AS-E). | Choose for designs prioritizing low-cost transformer design and relaxed standby power requirements. |
Compared with ICE2QS03G and LNK304P, VIPER22AS-E offers lower system cost through resistor-free startup and reduced component count, superior light-load efficiency via precise burst-mode entry, and tighter VDD hysteresis (6.5 V) for robust brown-out immunity in fluctuating auxiliary supplies.
Availability
VIPER22AS-E is available at Aetrix Electronics and suitable for battery charger adapters, TV/motor control auxiliary supplies, and industrial sensor interface PSUs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for VIPER22AS-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, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
VIPER series ICs are ST's dedicated family of high-voltage offline SMPS controllers targeting cost-sensitive, space-constrained power conversion in adapters, auxiliaries, and industrial subsystems-emphasizing integration, protection, and ease of certification.
FAQ
What is the minimum recommended VDD capacitor value for reliable startup?
A 100 nF ceramic capacitor is sufficient when using forward-wound auxiliary supply, as specified in ST Application Note AN2362. This value ensures adequate energy storage to sustain control circuit operation until the auxiliary winding begins delivering power-verified with 100 V ≤ VDS ≤ 400 V startup conditions and 14.5 V VDDon threshold.
Can VIPER22AS-E operate with US-wide input (85–265 Vac)?
Yes-it delivers up to 7 W output power under US-wide mains per Table 9, enabled by its 9–38 V VDD operating range and 60 kHz fixed frequency. The internal 730 V MOSFET withstands peak line voltages up to 375 V, eliminating need for derating or external clamping in this range.
How does the FB pin regulate output current in battery charger applications?
The FB pin sinks current proportional to secondary-side error signal via optocoupler. At 0 V FB voltage (shorted to SOURCE), peak drain current reaches 0.7 A (IDlim), setting maximum charge current. As FB current increases, IDlim decreases linearly-enabling precise CC/CV battery charging without secondary-side op-amps.
Is VIPER22AS-E qualified for industrial temperature range?
Yes-the junction temperature is internally limited, and the device operates continuously from −40 °C to +150 °C case temperature (TC). Thermal shutdown activates at 170 °C with 40 °C hysteresis, ensuring safe operation across extended industrial ambient conditions without external thermal management.
VIPER22AS-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPER™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Isolation:
- Isolated
- Internal Switch(s):
- Yes
- Voltage - Breakdown:
- 730V
- Topology:
- Flyback
- Voltage - Start Up:
- 14.5 V
- Voltage - Supply (Vcc/Vdd):
- 8V ~ 38V
- Duty Cycle:
- -
- Frequency - Switching:
- 60kHz
- Power (Watts):
- 7 W
- Fault Protection:
- Current Limiting, Over Temperature, Over Voltage
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TC)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
VIPER22AS-E FAQ
1.How can I place an order for VIPER22AS-E through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER22AS-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 VIPER22AS-E reliable?
The price and inventory of VIPER22AS-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER22AS-E is usually 5 days.
3.What payment methods are accepted for VIPER22AS-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER22AS-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER22AS-E?
VIPER22AS-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER22AS-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 VIPER22AS-E?
For technical support, including VIPER22AS-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER22AS-E requirements.
6.How does Aetrix verify that VIPER22AS-E is sourced from the original manufacturer or authorized distributors?
All VIPER22AS-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 VIPER22AS-E meets industry standards.
7.What is the process for return or replacement of VIPER22AS-E?
All VIPER22AS-E units undergo pre-shipment inspection (PSI). If there is an issue with VIPER22AS-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 VIPER22AS-E part is unused and in its original packaging.
Return procedure for VIPER22AS-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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