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STMicroelectronics VIPER114LSTR
- Part No.:
- VIPER114LSTR
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 10-SOP (0.154", 3.90mm Width)
- Datasheet:
-
VIPER114LSTR.pdf
- Description:
- IC OFFLINE SW MULT TOP 10SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
VIPER114LSTR from STMicroelectronics is a high-voltage offline PWM controller IC integrating an 800 V avalanche-rugged N-channel MOSFET, current-mode control, embedded HV startup, and sense-FET. It delivers up to 12 W in open-frame designs at 50 °C ambient, supports flyback/buck/buck-boost topologies, and operates with 60 kHz ±7% jittered switching frequency for EMI reduction. Used in low-power SMPS for home appliances and industrial controls.
For engineers reviewing the VIPER114LSTR datasheet, VIPER114LSTR pinout, VIPER114LSTR application, or VIPER114LSTR equivalent, this page provides verified technical context, real-world design meaning of key specs, SSOP10 package layout guidance, and validated alternative options for energy-efficient offline converter design.
Technical Context
The VIPER114LSTR implements current-mode PWM control with integrated 800 V power MOSFET and on-chip sense-FET for lossless primary-side current sensing. Its oscillator generates a fixed 60 kHz nominal switching frequency with ±7% spread-spectrum jitter at 260 Hz to reduce peak conducted EMI.
It features embedded thermal shutdown (150–160 °C), auto-restart protection against overload/short-circuit, line/output OVP, max duty cycle limiting, and pulse-skipping to prevent flux runaway during startup. The transconductance error amplifier has a 1.2 V internal reference and direct feedback capability via FB pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain Current Limit | 480 mA typ. - sets peak primary current threshold for overcurrent protection and power capability scaling. |
| Switching Frequency | 60 kHz ±7% - jittered frequency reduces EMI filter size and cost in Class B conducted emissions compliance. |
| VDS Rating | 800 V - enables universal AC input (85–265 VAC) without external snubber, simplifying front-end design. |
| No-Load Power | <10 mW at 230 VAC - meets stringent EU CoC Tier 2 and DOE Level VI standby efficiency requirements. |
| VCC Range | 4.5 V to 30 V - supports wide auxiliary supply range and robust operation across load transients and brownouts. |
| Thermal Shutdown | 150–160 °C - protects MOSFET and controller under sustained overload or poor heatsinking conditions. |
| RDS(on) | 17 Ω typ. at 25 °C - defines conduction loss and thermal dissipation in continuous conduction mode operation. |
Pinout & Package
Package: SSOP10 (Shrink Small Outline Package, 10-pin, 0.65 mm pitch), thermally enhanced with pins 6–10 internally connected to MOSFET drain metal pad for PCB copper area heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | MOSFET source & bias ground reference | Must be isolated from pulsed return paths; all bias component grounds tie directly to this pin to avoid noise coupling. |
| 2 VCC | Controller supply input | Charged by internal HV current source at startup; requires ≥10 µF storage cap + 0.1 µF ceramic bypass for stability. |
| 3 DIS | Disable input with debounce | Triggers 500 ms auto-restart disable when voltage exceeds 1.2 V for >1 ms; used for OVP or fault signaling. |
| 4 FB | Inverting input of transconductance error amplifier | Receives direct feedback from output divider (1.2 V reference); grounding disables E/A for primary regulation. |
| 5 COMP | Error amplifier output / loop compensation node | Connects to RC network for loop stability; driven externally by optocoupler in secondary-feedback configurations. |
| 6–10 DRAIN | Power MOSFET drain terminals | Shared mechanical connection to MOSFET die pad; requires large PCB copper pour for thermal management (RTH-JA = 95 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 800 V avalanche-rugged MOSFET | Eliminates need for external HV switch and startup resistor, reducing BOM count and board space in <12 W adapters. |
| Jittered 60 kHz oscillator | Spreads spectral energy to lower peak EMI amplitude, enabling smaller input EMI filter (reduced X/Y caps and common-mode choke). |
| Pulse-skip protection | Prevents flux runaway during startup by dynamically skipping cycles until output voltage stabilizes, improving reliability. |
| Embedded soft-start (8 ms) | Gradually ramps current limit from zero to 480 mA in 8 steps, avoiding inrush stress on transformer and output capacitor. |
| Ultra-low no-load consumption (<10 mW) | Meets global energy regulations (ERP Lot 6, DOE Level VI) without auxiliary winding or complex control schemes. |
Applications
| Smart Home Power Supply | Industrial Sensor Node PSU |
|---|---|
|
Use Scenario: Compact 5 V/1 A offline adapter powering Zigbee/Z-Wave modules in wall switches and smart thermostats. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller with direct feedback, providing stable output without optocoupler or TL431. Use Value: Enables <10 mm profile design with <10 mW standby power, meeting CE RED and FCC Part 15B Class B emissions limits. |
Use Scenario: 12 V/0.5 A isolated power supply for 4–20 mA loop-powered temperature/pressure sensors in factory automation. IC Role / Device Role / Timing Role: Flyback controller with secondary feedback via optocoupler, delivering tight output regulation across -40 to +85 °C ambient. Use Value: Integrated OVP, OLP, and thermal shutdown ensure fail-safe operation in unattended industrial environments. |
| LED Driver for Smart Lighting | White Goods Auxiliary PSU |
|
Use Scenario: Constant-voltage 12 V/0.3 A supply for RGBW LED strips in connected lighting systems with DALI or Bluetooth mesh control. IC Role / Device Role / Timing Role: Buck-boost topology controller supporting wide input (85–265 VAC) and dimmable output with minimal external components. Use Value: Jittered 60 kHz switching avoids audible noise in dimmed operation while maintaining <400 mW total input power at 250 mW load. |
Use Scenario: 3.3 V/0.2 A auxiliary supply for MCU, display, and communication interfaces in washing machines and dishwashers. IC Role / Device Role / Timing Role: Non-isolated buck converter controller using direct feedback, eliminating isolation barrier for cost-sensitive appliance designs. Use Value: 800 V MOSFET withstands surge events per IEC 61000-4-5 Level 3, ensuring long-term reliability in harsh mains environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar offline high-voltage PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE2QS03G | 700 V MOSFET, fixed 65 kHz frequency (no jitter), no integrated sense-FET; requires external current sensing. | Lacks built-in avalanche ruggedness and jittered frequency; higher EMI filter cost and reduced surge margin. | Choose only if legacy design reuse or lower unit cost outweighs EMI and reliability trade-offs. |
| LNK3206P | 725 V MOSFET, 66 kHz frequency, no integrated HV startup; requires external startup resistor and bias winding. | Higher component count and larger footprint; no direct feedback path - mandates optocoupler for regulation. | Prefer when secondary-side regulation is mandatory and thermal derating below 10 W is acceptable. |
Compared with ICE2QS03G and LNK3206P, VIPER114LSTR offers superior surge immunity (800 V), lower system-level BOM count (integrated HV startup/sense-FET), and inherent EMI advantage (jittered oscillator), making it optimal for compact, regulatory-compliant <12 W offline supplies.
Availability
VIPER114LSTR is available at Aetrix Electronics and suitable for smart home power supplies, industrial sensor node PSUs, and white goods auxiliary power requiring stable component supply, full production lifecycle support, and traceable sourcing.
Supply support for VIPER114LSTR 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
VIPER11 is ST's dedicated energy-saving offline high-voltage converter product line, engineered to replace discrete MOSFET+controller combinations in sub-12 W AC-DC applications while meeting global efficiency and emissions standards.
FAQ
What is the maximum continuous output power achievable with VIPER114LSTR in an open-frame design?
The VIPER114LSTR delivers up to 12 W continuous output power in open-frame configurations at 50 °C ambient temperature with adequate PCB copper heatsinking (100 mm² Cu area). This rating assumes 230 VAC input, proper layout, and thermal management per ST's AN4170 guidelines. Derating is required above 50 °C ambient or in enclosed adapters.
Can VIPER114LSTR operate without an auxiliary winding in isolated flyback designs?
Yes - VIPER114LSTR integrates a high-voltage startup current source that charges the VCC capacitor directly from the DRAIN pin, eliminating the need for an auxiliary winding during startup. In steady-state, however, an auxiliary winding is recommended for efficient self-supply and improved light-load efficiency.
How does the pulse-skip function prevent flux runaway during converter startup?
The pulse-skip circuit monitors DRAIN peak current within the minimum on-time (tON_MIN = 300 ns). If current exceeds the 480 mA limit before tON_MIN elapses, one switching cycle is skipped. This extends off-time, allowing full inductor discharge and preventing net flux accumulation - a critical safeguard before output voltage reaches regulation.
Is the SSOP10 package of VIPER114LSTR compatible with standard reflow soldering profiles?
Yes - the SSOP10 package is qualified for standard lead-free reflow soldering per JEDEC J-STD-020. Peak temperature must not exceed 260 °C, with time above 217 °C limited to 60–150 seconds. Pins 6–10 require thermal relief patterns and generous copper pour to manage junction-to-ambient thermal resistance (RTH-JA = 95 °C/W).
VIPER114LSTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPER™
- Package/Case:
- 10-SOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Isolation:
- Non-Isolated
- Internal Switch(s):
- Yes
- Voltage - Breakdown:
- 800V
- Topology:
- Buck, Buck-Boost, Flyback
- Voltage - Start Up:
- 16 V
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 30V
- Duty Cycle:
- 80%
- Frequency - Switching:
- 60kHz
- Power (Watts):
- 12 W
- Fault Protection:
- Over Load, Over Voltage
- Control Features:
- Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-SSOP
- Mounting Type:
- Surface Mount
VIPER114LSTR FAQ
1.How can I place an order for VIPER114LSTR through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER114LSTR 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 VIPER114LSTR reliable?
The price and inventory of VIPER114LSTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER114LSTR is usually 5 days.
3.What payment methods are accepted for VIPER114LSTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER114LSTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER114LSTR?
VIPER114LSTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER114LSTR 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 VIPER114LSTR?
For technical support, including VIPER114LSTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER114LSTR requirements.
6.How does Aetrix verify that VIPER114LSTR is sourced from the original manufacturer or authorized distributors?
All VIPER114LSTR 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 VIPER114LSTR meets industry standards.
7.What is the process for return or replacement of VIPER114LSTR?
All VIPER114LSTR units undergo pre-shipment inspection (PSI). If there is an issue with VIPER114LSTR, 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 VIPER114LSTR part is unused and in its original packaging.
Return procedure for VIPER114LSTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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