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STMicroelectronics VIPER38LE
- Part No.:
- VIPER38LE
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 10-SDIP (0.300", 7.62mm)
- Datasheet:
-
VIPER38LE.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 10DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,303
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Product details
Overview
VIPER38LE from STMicroelectronics is a high-voltage PWM current-mode controller IC integrating an 800 V avalanche-rugged N-channel power MOSFET, embedded HV startup generator, and adjustable dual-level overcurrent protection (IDlim = 1.15 A typ, IDMAX = 1.7 A). It operates at 60 kHz (L-type) or 115 kHz (H-type), delivers up to 30 W peak power in open-frame designs, and achieves 30 mW no-load consumption at 230 Vac - enabling compliance with stringent energy-saving standards in auxiliary power supplies.
For engineers reviewing the VIPER38LE datasheet, VIPER38LE pinout, VIPER38LE application, or VIPER38LE equivalent, key selection considerations include its SDIP10/SO16N dual-package support, EPT-controlled overload tolerance (2–3 sec), digital OVP strobe filtering (2 µs), and burst-mode operation for sub-100 mW standby performance.
Technical Context
The VIPER38LE implements a current-mode PWM architecture with integrated gate driver, jittered oscillator (±4 kHz or ±8 kHz modulation depth), and dual-stage protection logic: cycle-by-cycle OCP (adjustable via CONT pin) plus second-level hiccup-mode OCP triggered at 1.7 A. Its HV startup circuit draws current directly from the DRAIN pin above 80 V, eliminating external startup resistors.
Operation includes soft-start (8.5 ms typical), thermal shutdown at 155 °C with 30 °C hysteresis, automatic fault recovery with low-duty restart, and digitally filtered output overvoltage protection (VOVP = 3.0 V ±0.3 V, strobed for noise immunity). The FB pin enables burst-mode entry below 0.6 V and provides loop regulation via internal 200 µA current source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain voltage rating | 800 V - supports universal AC input (85–265 Vac) without external HV clamping |
| Peak output power | 30 W (peak, 2 sec) - enables short-term surge handling in metering and adapter applications |
| No-load consumption | 30 mW at 230 Vac - meets EU CoC Tier 2 and DOE Level VI standby requirements |
| Operating frequency | 60 kHz (VIPER38L) or 115 kHz (VIPER38H) - selectable via part variant; jitter reduces EMI peaks |
| Current limit threshold | IDlim = 1.15 A (25 °C), adjustable down via CONT pin resistor - prevents transformer saturation under light load |
| OVP threshold | 3.0 V ±0.3 V with 2 µs digital strobe - rejects line transients while ensuring fast secondary-side overvoltage shutdown |
| Thermal shutdown | 155 °C activation with 30 °C hysteresis - sustains safe operation during sustained overload or poor heatsinking |
Pinout & Package
VIPER38LE is available in SDIP10 (10-pin stretched dual-in-line plastic) and SO16 Narrow (16-pin small outline) packages. Both feature exposed drain pads for enhanced thermal dissipation; SDIP10 uses pins 1–2 as GND/Source and pins 13–16 as DRAIN, while SO16N assigns pins 1–2 to GND, pins 13–16 to DRAIN, and pins 9–12 as NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (pins 1–2) | Device ground & MOSFET source | Common reference for control logic and power return path; must be low-inductance connection |
| DRAIN (pins 13–16) | High-voltage MOSFET drain | Carries full primary-side switching current; connected to metal frame for heat sinking |
| VDD (pin 5) | Controller supply rail | Powered by internal HV startup current; clamped at 23.5 V; UVLO thresholds at 14 V (on) / 8 V (off) |
| CONT (pin 6) | Current limit & OVP configuration | Adjusts IDlim downward via external resistor; also enables digital OVP monitoring with noise filtering |
| FB (pin 7) | Feedback & burst-mode control | Sourced 200 µA current; burst mode activates below 0.6 V; >3.5 V triggers OLP shutdown |
| EPT (pin 8) | Extra power timer interface | Connects external capacitor to extend overload tolerance to 2–3 seconds before hiccup mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 800 V avalanche-rugged MOSFET | Eliminates need for external HV switch and snubber in <30 W flyback topologies |
| Embedded HV startup generator | Draws current directly from DRAIN pin above 80 V - removes startup resistor and associated losses |
| Jittered oscillator | ±4 kHz (L) or ±8 kHz (H) frequency spread - reduces conducted and radiated EMI without external components |
| Dual-level overcurrent protection | IDlim (1.15 A) + IDMAX (1.7 A) - prevents transformer saturation *and* handles secondary diode shorts |
| Soft-start (8.5 ms) | Gradually ramps duty cycle - limits inrush stress on transformer, rectifier, and bulk capacitor |
| Burst-mode operation | Activates below 0.6 V on FB pin - cuts switching losses to achieve <30 mW no-load consumption |
Applications
| Smart Energy Meters | Industrial PLC Auxiliary Supplies |
|---|---|
|
Use Scenario: Powering microcontroller, RTC, and communication ICs (e.g., NB-IoT modem) in sealed, non-ventilated meter enclosures. IC Role / Device Role / Timing Role: Primary-side flyback controller managing isolated 5 V/3.3 V rails with burst-mode sleep cycles synchronized to metering intervals. Use Value: 30 mW no-load draw extends battery backup life; 800 V drain rating tolerates grid surges up to 4 kV without derating. |
Use Scenario: Generating isolated 24 V and 5 V rails for I/O modules and fieldbus interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-reliability AC-DC converter with thermal shutdown and auto-restart - maintains uptime during ambient temperature excursions. Use Value: Dual OCP stages prevent nuisance tripping during motor start-up surges while protecting against sustained short circuits. |
| Compact AC Adapters | Home Appliance Control Boards |
|
Use Scenario: 12 V/1 A wall-wart powering smart speaker DSPs and voice recognition SoCs. IC Role / Device Role / Timing Role: Integrated controller-MOSFET delivering regulated output with EPT-enabled 2-second peak load tolerance for audio burst processing. Use Value: SDIP10 package enables <12 mm height design; jittered oscillator meets CISPR-32 Class B conducted EMI limits without Y-capacitor. |
Use Scenario: On-board auxiliary supply for washing machine mainboard MCU, display, and sensor interface. IC Role / Device Role / Timing Role: Flyback controller with digital OVP strobing - rejects ESD-induced false triggers on feedback path during door slam events. Use Value: 2 µs OVP strobe window ensures only sustained overvoltage (>100 ms) initiates shutdown, avoiding transient-induced resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE3B0565J | 650 V drain rating, fixed 65 kHz frequency, no EPT or digital OVP strobe | Lacks surge tolerance for 265 Vac+ grids; requires external OVP comparator for noise immunity | Prefer VIPER38LE where universal input range or robust OVP is required |
| LNK3206D | 725 V rating, integrated X-cap discharge, but no adjustable OCP or EPT | Lower peak power (25 W), no programmable overload timer - unsuitable for metering burst loads | Choose VIPER38LE when >25 W peak or precise OCP tuning is needed |
Compared with ICE3B0565J and LNK3206D, VIPER38LE uniquely combines 800 V ruggedness, dual OCP thresholds, and EPT-based overload extension - making it optimal for energy meters and adapters requiring both surge resilience and transient load handling.
Availability
VIPER38LE is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC auxiliary supplies, and compact AC adapters requiring stable component supply across extended product lifecycles.
Supply support for VIPER38LE 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, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
VIPER38LE belongs to the VIPerPlus family of high-voltage offline controllers designed specifically for cost-sensitive, space-constrained AC-DC conversion in auxiliary power supplies and low-to-mid power adapters.
FAQ
What package options are available for VIPER38LE?
VIPER38LE is offered in SDIP10 (10-pin stretched DIP) and SO16 Narrow (16-pin small outline) packages. Both feature exposed drain terminals for thermal conduction to PCB copper; SDIP10 is optimized for through-hole assembly in cost-sensitive adapters, while SO16N supports surface-mount automation and higher power density layouts.
How does the Extra Power Timer (EPT) function in practice?
The EPT pin accepts an external capacitor to delay second-level OCP activation. When overload occurs, the IC sustains full power for 2–3 seconds (set by CEPT) before entering hiccup mode - enabling brief peak loads like motor startup or audio burst processing without system reset.
Can VIPER38LE operate without an external feedback optocoupler?
No - VIPER38LE requires an optocoupler-connected feedback network to the FB pin for regulation. Its internal 200 µA current source drives the optocoupler LED; voltage at FB determines operating mode (burst, normal, or OLP shutdown), so isolation is mandatory for secondary-side sensing.
What is the significance of the digital OVP strobe time?
The 2 µs strobe window means VIPER38LE samples the FB voltage only during this narrow interval after each switching cycle. This rejects fast transients (e.g., ESD or switching spikes) that would falsely trigger OVP, ensuring shutdown occurs only during sustained overvoltage conditions - critical for reliability in noisy appliance environments.
VIPER38LE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPer™ plus
- Package/Case:
- 10-SDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Output Isolation:
- Isolated
- Internal Switch(s):
- Yes
- Voltage - Breakdown:
- 800V
- Topology:
- Flyback
- Voltage - Start Up:
- 14 V
- Voltage - Supply (Vcc/Vdd):
- 8.5V ~ 23.5V
- Duty Cycle:
- 80%
- Frequency - Switching:
- 60kHz
- Power (Watts):
- 20 W
- Fault Protection:
- Current Limiting, Over Temperature, Over Voltage, Short Circuit
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-SDIP
- Mounting Type:
- Through Hole
VIPER38LE FAQ
1.How can I place an order for VIPER38LE through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER38LE 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 VIPER38LE reliable?
The price and inventory of VIPER38LE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER38LE is usually 5 days.
3.What payment methods are accepted for VIPER38LE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER38LE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER38LE?
VIPER38LE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER38LE 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 VIPER38LE?
For technical support, including VIPER38LE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER38LE requirements.
6.How does Aetrix verify that VIPER38LE is sourced from the original manufacturer or authorized distributors?
All VIPER38LE 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 VIPER38LE meets industry standards.
7.What is the process for return or replacement of VIPER38LE?
All VIPER38LE units undergo pre-shipment inspection (PSI). If there is an issue with VIPER38LE, 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 VIPER38LE part is unused and in its original packaging.
Return procedure for VIPER38LE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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