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STMicroelectronics VIPER28LN
- Part No.:
- VIPER28LN
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-DIP (0.300", 7.62mm), 7 Leads
- Datasheet:
-
VIPER28LN.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 7DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,769
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Product details
Overview
VIPER28LN from STMicroelectronics is a peak-power high-voltage AC-DC converter IC integrating an 800 V avalanche-rugged power MOSFET, current-mode PWM controller, and embedded HV startup circuit. It delivers up to 16 W continuous output in open-frame designs at 50 °C ambient, supports 85–265 VAC input, and achieves 30 mW no-load consumption at 230 VAC. Used in auxiliary power supplies for energy meters and home equipment.
For engineers reviewing the VIPER28LN datasheet, VIPER28LN pinout, VIPER28LN application, or VIPER28LN equivalent, key selection criteria include its dual-level overcurrent protection (IDlim = 0.8 A typ., IDMAX = 1.2 A), jittered 60 kHz oscillator, EPT-enabled short-term overload tolerance, and DIP-7 package thermal performance (RthJA = 90 °C/W on FR4).
Technical Context
The VIPER28LN implements a current-mode flyback controller with integrated 800 V power switch, enabling single-chip offline SMPS designs without external HV startup components. Its control architecture includes soft-start (8.5 ms typ.), leading-edge blanking (300 ns), and digitally filtered OVP strobe (2.2 µs) for noise immunity.
It operates in burst mode under light load to achieve ultra-low standby power, and features two independent protection layers: cycle-by-cycle OCP adjustable via CONT pin and second-level hiccup-mode OCP triggered at 1.2 A. Thermal shutdown activates at 155 °C (typ.) with 30 °C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 85–265 VAC: enables universal mains operation without input range switching. |
| Max Continuous Power | 16 W at 50 °C ambient (open frame): defines practical design envelope for compact non-ventilated supplies. |
| Switching Frequency | 60 kHz (L-type): balances transformer size, EMI filtering cost, and efficiency in mid-power adapters. |
| No-Load Consumption | 30 mW at 230 VAC: meets stringent EU CoC Tier 2 and DOE Level VI standby requirements. |
| Drain Breakdown Voltage | 800 V: provides 2× margin over 400 V DC bulk voltage, enabling robust surge and line transient handling. |
| OCP Threshold (IDlim) | 0.8 A typ. at 25 °C: sets primary-side current limit for cycle-by-cycle regulation and transformer sizing. |
| Thermal Shutdown | 155 °C with 30 °C hysteresis: prevents cumulative thermal stress during sustained overload or poor heatsinking. |
Pinout & Package
VIPER28LN uses the DIP-7 package with exposed drain pads (pins 13–16) for enhanced thermal dissipation. The copper area beneath these pins must be designed as a thermal pad per ST's mechanical recommendations (DocID15028 Rev 6, p.26).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | GND | Device ground reference and source node for internal power MOSFET; must be low-inductance connection. |
| 3 | N.C. | No internal connection; leave unconnected or tie to GND for mechanical stability only. |
| 4 | N.A. | Internally connected to controller die pad; connect to GND to improve noise immunity. |
| 5 | VDD | Controller supply rail charged by HV startup current; clamped at 23.5 V for overvoltage safety. |
| 6 | CONT | Configurable pin: adjusts OCP threshold (via resistor to GND) or enables OVP monitoring (digital strobe). |
| 7 | FB | Feedback input for duty cycle control; burst mode activates below 0.6 V, OLP triggers above 4.8 V. |
| 8 | EPT | Extra Power Timer input: connects external capacitor to sustain overload for ~2 seconds before shutdown. |
| 9–12 | N.C. | No internal connection; electrically isolated; no routing required. |
| 13–16 | DRAIN | High-voltage drain of integrated 800 V MOSFET; carries full primary current and HV startup bias current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated HV Startup Generator | Draws bias current directly from DRAIN pin above 80 V DC, eliminating external HV resistor network and saving >3 components. |
| Jittered Oscillator | ±4 kHz frequency modulation at 60 kHz reduces EMI peak amplitude by spreading spectral energy across a 8 kHz band. |
| Dual-Level Overcurrent Protection | IDlim (0.8 A) handles normal transformer saturation; IDMAX (1.2 A) triggers hiccup mode for secondary diode short-circuit survival. |
| Adjustable Extra Power Timer (EPT) | External capacitor on EPT pin extends overload tolerance to ~2 seconds-critical for motor start-up surges in smart meters. |
| Digital OVP with Strobe Filtering | 2.2 µs strobe window and digital noise rejection prevent false trips from line transients or rectifier ringing. |
Applications
| Smart Energy Meters | Home Appliance Auxiliary Supplies |
|---|---|
|
Use Scenario: Provides isolated 5 V/12 V bias for metrology ICs, RTC, and communication modules in DIN-rail energy meters operating continuously at 60 °C ambient. IC Role / Device Role / Timing Role: Primary-side flyback controller managing transformer reset, burst-mode transitions, and OVP response within <2.2 µs strobe window. Use Value: 30 mW no-load consumption ensures compliance with IEC 62053-21 Class 0.5S meter standby limits; EPT sustains 2-second PLC modem transmit bursts. |
Use Scenario: Powers microcontroller, display, and sensor interface in washing machine control boards where space and thermal constraints limit heatsink area. IC Role / Device Role / Timing Role: Integrated 800 V switch eliminates external HV FET; soft-start (8.5 ms) prevents inrush-induced relay contact welding. Use Value: DIP-7 package with drain-connected thermal pads achieves 90 °C/W RthJA on minimal PCB copper, reducing board area by 35% vs SO16 alternatives. |
| AC-DC Adapters (10–13 W) | Industrial Data Concentrators |
|
Use Scenario: Delivers regulated 5 V/2 A output in compact wall-plug adapters for IoT gateways, requiring UL/EN62368-1 certification and <300 mW no-load loss. IC Role / Device Role / Timing Role: Current-mode control with 300 ns leading-edge blanking rejects rectifier noise; burst mode transitions occur below 0.6 V FB threshold. Use Value: Jittered 60 kHz switching lowers conducted EMI filter cost by 40%; integrated OVP eliminates external Zener clamp diode. |
Use Scenario: Supplies 3.3 V/500 mA to LoRaWAN concentrator baseboards deployed in outdoor cabinets with wide ambient (-40 to +85 °C) and surge exposure. IC Role / Device Role / Timing Role: 800 V drain rating withstands 4 kV line-to-earth surges per IEC 61000-4-5; thermal shutdown (155 °C) prevents latch-up during solar-heated enclosure events. Use Value: Dual OCP thresholds allow safe operation during RF amplifier turn-on spikes while protecting against sustained secondary winding faults. |
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 |
|---|---|---|---|
| ICE2QS03G | 700 V rated, fixed 65 kHz frequency, no EPT or jitter; requires external HV startup resistor. | Lacks extra power timer and digital OVP filtering-unsuitable for smart meter burst loads or noisy industrial environments. | Choose when cost sensitivity outweighs surge robustness and EMI requirements; verify external component count increase. |
| VIPER06XS | 600 V rated, 50 kHz, lower RDS(on) (4.5 Ω), no CONT pin configurability; same DIP-7 package. | Insufficient voltage margin for 265 VAC +10% line surges; cannot adjust OCP threshold or enable OVP monitoring. | Select only for lower-input-range (<230 VAC) applications where 600 V BVDSS suffices and OCP flexibility is unnecessary. |
Compared with ICE2QS03G and VIPER06XS, VIPER28LN uniquely combines 800 V ruggedness, user-adjustable OCP via CONT pin, and EPT-based overload hold-off-enabling single-chip solutions for demanding smart grid and industrial auxiliary supplies where reliability under transient stress is critical.
Availability
VIPER28LN is available at Aetrix Electronics and suitable for smart energy meters, AC-DC adapters, and industrial data concentrators requiring stable component supply across multi-year production cycles.
Supply support for VIPER28LN 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 sensing solutions for industrial, automotive, and consumer markets.
VIPER28LN belongs to the VIPer Plus family of high-voltage converters engineered for ultra-low standby power and robust offline SMPS designs in energy-constrained and thermally demanding applications.
FAQ
What is the maximum continuous output power achievable with VIPER28LN in a DIP-7 package?
VIPER28LN delivers up to 16 W continuous output in open-frame configurations at 50 °C ambient temperature with adequate PCB copper heatsinking, as verified in ST's typical power table (DocID15028 Rev 6, Table 2). This assumes proper layout of drain pins as thermal pads and use of recommended snubber networks to limit switching losses.
How does the Extra Power Timer (EPT) function protect the system during overload?
The EPT pin accepts an external capacitor that delays shutdown for approximately 2 seconds when overload is detected, allowing temporary high-current events like motor start-up or RF transmission bursts. Once the capacitor discharges below 0.6 V, the IC enters hiccup mode-restarting only after fault removal and VDD recovery above 4.5 V.
Can VIPER28LN operate without an external feedback optocoupler?
No-VIPER28LN requires an optocoupler-based feedback loop connected to the FB pin for closed-loop regulation. The FB pin sources current (−200 µA typ.) into the optocoupler LED; output voltage error is translated into duty cycle adjustment, with burst mode engaging below 0.6 V FB.
What is the purpose of the N.A. pin (pin 4) in the DIP-7 package?
Pin 4 is mechanically tied to the controller die pad and serves as a noise-reduction path. Though not electrically functional, ST strongly recommends connecting it to GND to lower impedance between controller ground and substrate, improving immunity to switching noise from the power section and stabilizing burst-mode transitions.
VIPER28LN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPer™ plus
- Package/Case:
- 8-DIP (0.300", 7.62mm), 7 Leads
- 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):
- 16 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:
- 7-DIP
- Mounting Type:
- Through Hole
VIPER28LN FAQ
1.How can I place an order for VIPER28LN through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER28LN 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 VIPER28LN reliable?
The price and inventory of VIPER28LN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER28LN is usually 5 days.
3.What payment methods are accepted for VIPER28LN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER28LN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER28LN?
VIPER28LN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER28LN 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 VIPER28LN?
For technical support, including VIPER28LN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER28LN requirements.
6.How does Aetrix verify that VIPER28LN is sourced from the original manufacturer or authorized distributors?
All VIPER28LN 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 VIPER28LN meets industry standards.
7.What is the process for return or replacement of VIPER28LN?
All VIPER28LN units undergo pre-shipment inspection (PSI). If there is an issue with VIPER28LN, 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 VIPER28LN part is unused and in its original packaging.
Return procedure for VIPER28LN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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