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STMicroelectronics VIPER50SP
- Part No.:
- VIPER50SP
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- PowerSO-10 Exposed Bottom Pad
- Datasheet:
-
VIPER50SP.pdf
- Description:
- IC OFFLIN CONV FLBACK 5PENTAWATT
- Quantity:
- Payment:
- Shipping:
Inventory:4,266
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Product details
Overview
VIPER50SP from STMicroelectronics is a high-voltage, current-mode PWM controller with integrated 620V/1.5A avalanche-rugged vertical power MOSFET, designed for primary-side SMPS control in offline AC-DC converters. It delivers up to 25W in universal-input wide-range configurations, features adjustable switching frequency up to 200 kHz, internal start-up supply, and burst-mode operation enabling <1W standby consumption per Blue Angel norm.
For engineers reviewing the VIPER50SP datasheet, VIPER50SP pinout, VIPER50SP application, or VIPER50SP equivalent, key selection considerations include its integrated Zener-trimmed 13V VDD regulation, 250 ns current-sense blanking, 1.7 µs shutdown delay, 5 Ω RDS(on) at Tj = 100°C, and compatibility with both primary- and secondary-side regulation topologies.
Technical Context
The VIPER50SP implements a fixed-frequency current-mode control architecture with inner current-loop sensing via drain-source voltage monitoring and outer voltage-loop regulation through a transconductance error amplifier (Gm = 1.5 mA/V, GBW = 150 kHz). Its oscillator supports external Rt-Ct programming and synchronization input on the OSC pin.
Protection logic integrates undervoltage lockout (8 V turn-on / 7.5 V turn-off with 2.4 V hysteresis), overtemperature shutdown (140–170 °C trip, 40 °C hysteresis), and automatic burst mode triggered when COMP voltage falls below 0.5 V - enabling zero-duty-cycle stand-by without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 620 V - Withstands full rectified mains voltage in universal-input (85–265 VAC) flyback designs without external snubber. |
| RDS(on) | 5.0 Ω @ Tj = 100°C - Enables efficient 25W output at full load with minimal conduction loss in compact PENTAWATT HV package. |
| FSW | Adjustable 90–110 kHz (typ.) - Set by external Rt-Ct network; stable across VDD = 9–15 V, supporting EMI optimization and transformer size reduction. |
| IDPEAK | 2.0 A (typ.) - Internally limited peak current ensures robust short-circuit protection and predictable power delivery under transient overload. |
| VDD Regulation | 13.0 V ±0.4 V - Internally trimmed reference enables self-biased operation from auxiliary winding; eliminates need for external LDO or Zener clamp. |
| Standby Power | <1 W total system consumption - Achieved via automatic burst mode with zero-duty-cycle shutdown, compliant with Blue Angel eco-norm. |
| Thermal Shutdown | 140–170 °C with 40 °C hysteresis - Prevents thermal runaway during sustained overload or poor heatsinking while allowing safe recovery. |
Pinout & Package
Package: PowerSO-10™ (PENTAWATT HV, 022Y footprint), surface-mount, thermally enhanced with exposed drain pad for direct PCB heat sinking (Rthj-case = 1.9 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRAIN | Integrated MOSFET drain | High-voltage node connected to primary winding; supplies internal start-up current via integrated HV current source; handles unclamped avalanche energy (30 mJ). |
| SOURCE | MOSFET source / power ground | Primary-side common return; used as current-sense reference for internal peak-current detection; tied to PCB ground plane for thermal and noise control. |
| VDD | Low-voltage supply & regulation reference | Provides bias for control circuitry; regulates at 13 V; enables primary/secondary feedback via internal error amp connection; triggers UVLO (8 V on / 7.5 V off). |
| COMP | Error amplifier output & shutdown input | Transconductance output (1.5 mA/V) for loop compensation; drops below 0.5 V to force zero-duty-cycle burst mode; accepts optocoupler feedback directly. |
| OSC | Oscillator timing & sync input | Accepts external Rt-Ct network for frequency setting; tolerant of VDD variation; supports external clock synchronization via TTL-level pulses (500 ns pulse width). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated HV Start-up Supply | Internal current source draws bias directly from DRAIN pin - eliminates external high-voltage resistor network and associated power loss. |
| Avalanche-Rugged Power MOSFET | Rated for 1.5 A repetitive avalanche current and 30 mJ single-pulse energy - enables snubberless operation and improves reliability in low-cost flyback designs. |
| Programmable Burst Mode | Automatic transition to zero-duty-cycle operation when COMP < 0.5 V - achieves sub-1W standby without auxiliary controllers or external timers. |
| Current-Mode Control with Blanking | 250 ns blanking window after switch turn-on - suppresses false triggering from transformer leakage inductance spikes and diode reverse-recovery noise. |
| Thermal Protection with Hysteresis | 140–170 °C shutdown threshold with 40 °C hysteresis - prevents thermal cycling and ensures safe restart only after sufficient cooling. |
Applications
| Smart Home Power Adapters | Industrial Sensor Power Supplies |
|---|---|
Use Scenario: Compact 12 V/2 A wall adapter powering Zigbee/Z-Wave gateways with strict EU EcoDesign standby requirements. IC Role / Device Role / Timing Role: Primary-side PWM controller and power switch in discontinuous-conduction-mode (DCM) flyback topology; regulates output via optocoupler feedback to COMP pin. Use Value: Achieves <0.8 W no-load consumption using built-in burst mode, eliminating need for auxiliary low-power controller IC and reducing BOM count by 3 components. | Use Scenario: Isolated 5 V/500 mA power supply for field-mounted temperature/pressure transmitters in hazardous-area industrial enclosures. IC Role / Device Role / Timing Role: Self-starting, primary-regulated flyback controller with integrated 620 V MOSFET; operates from 85–305 VAC input with reinforced isolation. Use Value: Eliminates external HV start-up resistor and discrete MOSFET, reducing creepage/clearance risk and improving MTBF in dusty, high-humidity environments. |
| White Goods Auxiliary Supplies | LED Driver Standby Circuits |
Use Scenario: 5 V/100 mA auxiliary supply for microcontroller and display in washing machine control boards, required to remain active during sleep mode. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller with VDD referenced to auxiliary winding; uses internal 13 V regulator for stable bias under varying load. Use Value: Maintains tight 5 % output regulation across 10–100 % load range while drawing only 0.35 W at 10 mA load - meets IEC 62301 Class B standby limits. | Use Scenario: Standby power rail for smart LED luminaires with DALI or Bluetooth mesh connectivity, requiring always-on low-power capability. IC Role / Device Role / Timing Role: Burst-mode SMPS controller supplying 3.3 V/50 mA to radio SoC; transitions seamlessly between active and zero-power states based on RF activity. Use Value: Reduces system standby power from 1.2 W (discrete solution) to 0.75 W using internal COMP-threshold shutdown - extends compliance margin for ENERGY STAR v2.1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary-side SMPS controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE2QS03G | 700 V MOSFET, fixed 65 kHz frequency, no programmable burst mode - relies on external circuitry for <1 W standby. | Requires external HV start-up network and opto-feedback conditioning; less suitable for ultra-low-standby designs. | Preferred where fixed frequency simplifies EMI filtering and higher VDSS is needed for 305 VAC industrial inputs. |
| LNK304P | 700 V, 170 mA max current, no integrated oscillator - uses frequency-jittering for EMI reduction; lower power rating (12 W). | Limited to low-power applications; lacks internal VDD regulation and requires external bias winding design. | Chosen for cost-sensitive, low-output-power (<10 W) consumer adapters where jittered frequency meets CISPR-22 Class B. |
Compared with ICE2QS03G and LNK304P, VIPER50SP offers superior integration (HV start-up, 13 V VDD regulation, burst-mode trigger), higher output capability (25 W), and tighter standby compliance - making it optimal for mid-power, eco-regulation-driven designs where component count and reliability are critical.
Availability
VIPER50SP is available at Aetrix Electronics and suitable for smart home adapters, industrial sensor power supplies, white goods auxiliary rails, and LED driver standby circuits requiring stable component supply and long-term lifecycle support.
Supply support for VIPER50SP 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.
VIPER50SP belongs to the VIPer™ family of integrated primary-side SMPS controllers, engineered specifically for cost-optimized, high-reliability offline power conversion in space-constrained applications demanding regulatory compliance and minimal external components.
FAQ
What is the maximum continuous output power achievable with VIPER50SP in a universal-input flyback design?
VIPER50SP supports up to 25W continuous output power in wide-range (85–265 VAC) flyback configurations using standard FR-4 PCB layout and minimum recommended copper area. This rating assumes 620V/1.5A MOSFET operation, 100 kHz switching, and proper thermal management per the PowerSO-10™ package's 1.9 °C/W junction-to-case resistance. Derating applies above 60°C ambient.
How does the internal current-limit function interact with external COMP pin voltage?
The internal peak current limit is set to ~2.0 A (typ.) but can be reduced externally by clamping the COMP pin voltage below its nominal operating range (1–3 V). When COMP falls below 0.5 V, the device enters full shutdown with zero duty cycle; between 0.5 V and 1.0 V, peak current scales linearly down to zero. This allows precise, programmable current limiting using simple resistive dividers or optocoupler bias networks.
Can VIPER50SP operate without an auxiliary winding for VDD supply?
No - VIPER50SP requires an auxiliary winding to sustain VDD after startup. The internal HV start-up current source only charges the VDD capacitor until VDD reaches 11 V; thereafter, the auxiliary winding must supply ≥16 mA (at 12 V, 200 kHz) to maintain regulation. Without it, VDD collapses to UVLO threshold and the device cycles repeatedly, unable to sustain normal operation.
What is the purpose of the 250 ns blanking time, and how does it affect transformer selection?
The 250 ns blanking time disables current-sense comparison immediately after MOSFET turn-on to ignore parasitic ringing from transformer leakage inductance and secondary diode reverse recovery. This prevents false overcurrent trips, allowing use of standard low-cost transformers without tight leakage control. Designers must ensure primary leakage inductance produces ring periods <250 ns - typically achieved with ≤2 % leakage specification.
VIPER50SP 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:
- 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
VIPER50SP FAQ
1.How can I place an order for VIPER50SP through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER50SP 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 VIPER50SP reliable?
The price and inventory of VIPER50SP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER50SP is usually 5 days.
3.What payment methods are accepted for VIPER50SP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER50SP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER50SP?
VIPER50SP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER50SP 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 VIPER50SP?
For technical support, including VIPER50SP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER50SP requirements.
6.How does Aetrix verify that VIPER50SP is sourced from the original manufacturer or authorized distributors?
All VIPER50SP 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 VIPER50SP meets industry standards.
7.What is the process for return or replacement of VIPER50SP?
All VIPER50SP units undergo pre-shipment inspection (PSI). If there is an issue with VIPER50SP, 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 VIPER50SP part is unused and in its original packaging.
Return procedure for VIPER50SP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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