My Inquiry
My Account
STMicroelectronics VIPER26HD
- Part No.:
- VIPER26HD
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
VIPER26HD.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:114
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
VIPER26HD from STMicroelectronics is a high-voltage current-mode PWM controller IC integrating an 800 V avalanche-rugged power MOSFET, embedded HV startup circuitry, and jittered oscillator (115 kHz ±8 kHz). It delivers up to 20 W in open-frame designs at 50 °C ambient, supports flyback/buck/buck-boost topologies, and achieves <30 mW no-load input power at 230 VAC - enabling compliance with stringent energy-saving standards for auxiliary power supplies.
For engineers reviewing the VIPER26HD datasheet, VIPER26HD pinout, VIPER26HD application, or VIPER26HD equivalent, this device is selected for compact, low-component-count AC/DC converters requiring wide-input-range operation (85–265 VAC), burst-mode light-load efficiency, adjustable current limiting, and integrated thermal shutdown with hysteresis.
Technical Context
The VIPER26HD implements a fixed-frequency current-mode PWM architecture with internal sense-FET and transconductance error amplifier referenced to 3.3 V on FB. Its oscillator features ±8 kHz frequency jitter at ~230 Hz to reduce EMI filter cost, while soft-start (8.5 ms) controls cycle-by-cycle drain current ramp-up to prevent transformer saturation.
Thermal protection uses a hysteretic shutdown (150–160 °C trip range, 30 °C hysteresis), and overload/short-circuit protection employs an up-down counter with automatic restart after 1 s. The LIM pin allows external resistor-based reduction of the default 0.7 A drain current limit, and burst mode activates when COMP voltage falls below 1.1 V (with 40 mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain Voltage Rating | 800 V - enables direct rectified mains input (up to 265 VAC) without snubber scaling |
| Switching Frequency | 115 kHz ±8 kHz - spread-spectrum modulation reduces peak EMI amplitude |
| No-Load Input Power | <30 mW @ 230 VAC - meets EU CoC Tier 2 and DOE Level VI standby requirements |
| Drain Current Limit | 0.7 A typ. - sets maximum peak primary current; adjustable downward via LIM pin resistor |
| FB Reference Voltage | 3.3 V - defines output regulation point in non-isolated configurations |
| Burst Mode Threshold | 1.1 V on COMP pin - triggers low-frequency switching to minimize light-load losses |
| Thermal Shutdown | 150 °C with 30 °C hysteresis - prevents permanent junction damage during sustained overtemperature |
| Startup Drain Voltage | 90 V - HV current source activates only after bulk capacitor reaches safe operating level |
Pinout & Package
VIPER26HD is available in SO16 narrow (SO16N) and DIP-7 packages. Both variants share identical pin functions but differ in terminal count and layout. Thermal design requires copper area under DRAIN pins (pins 13–16 in SO16N; pins 1 & 8 in DIP-7) to reduce RTH-JA to 85 °C/W (SO16N, 100 mm² Cu) or 95 °C/W (DIP-7, 100 mm² Cu).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (DIP7 pin 1,2; SO16N pins 1,2) | Controller ground & MOSFET source | Common reference for all internal circuits and return path for sense-FET current |
| VDD (DIP7 pin 5; SO16N pin 5) | Controller supply rail | Charged by internal HV current source at startup; powers control logic during normal operation |
| LIM (DIP7 pin 6; SO16N pin 6) | Current limit set point | Sinks adjustable current to scale down default 0.7 A drain limit; open = full limit |
| FB (DIP7 pin 7; SO16N pin 7) | Inverting input of error amplifier | Receives feedback voltage referenced to 3.3 V; shorting to GND disables internal EA for opto-coupled designs |
| COMP (DIP7 pin 8; SO16N pin 8) | Error amplifier output | Drives compensation network; voltage range 1.1–3.0 V determines peak current and burst entry/exit |
| DRAIN (DIP7 pins 1,8; SO16N pins 13–16) | MOSFET drain terminals | High-voltage switching node; mechanically tied to MOSFET die pad for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 800 V power MOSFET | Eliminates external HV switch and reduces BOM count in offline SMPS |
| Jittered 115 kHz oscillator | Spreads EMI energy across ±8 kHz bandwidth, lowering filter component cost and size |
| Hysteretic thermal shutdown | Prevents thermal runaway with 30 °C recovery margin after 150 °C trip |
| Built-in soft-start (8.5 ms) | Gradually increases current limit to avoid inrush stress on secondary diode and transformer |
| Adjustable OCP via LIM pin | Enables precise current limiting using single external resistor - no additional sensing components |
| Embedded HV startup generator | Self-biases from DRAIN pin above 90 V, removing need for startup resistor network |
Applications
| Auxiliary Power Supply for Appliances | Power Metering |
|---|---|
Use Scenario: Standby power supply for washing machines, refrigerators, and HVAC controllers requiring continuous 5 V/12 V rails at <30 mW no-load consumption. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology; regulates output via primary-side sensing or optocoupler feedback. Use Value: Meets IEC 62301 Ed.2 Class 1 standby limits and eliminates external startup resistor, reducing board space by >15%. | Use Scenario: Isolated DC bias supply for metrology ICs (e.g., ADE78xx) in smart electricity meters operating across 85–265 VAC mains. IC Role / Device Role / Timing Role: Flyback controller with primary-side regulation; provides galvanically isolated 3.3 V/5 V for ADC and communication interfaces. Use Value: 800 V MOSFET withstands surge transients per IEC 61000-4-5; burst mode ensures <100 mW total system standby draw. |
| LED Drivers for Commercial Lighting | SMPS for Set-Top Boxes |
Use Scenario: Constant-voltage LED driver for panel lights and signage, delivering 24 V/0.5 A from universal AC input with dimming compatibility. IC Role / Device Role / Timing Role: Buck-boost controller with analog dimming interface; COMP pin used for current scaling via external voltage. Use Value: Adjustable current limit (via LIM) enables precise LED string current control without secondary sensing. | Use Scenario: Main 12 V/1.5 A power supply in consumer STB enclosures with strict EMI class B limits and thermal constraints. IC Role / Device Role / Timing Role: Fixed-frequency flyback controller with jittered oscillator; drives transformer primary with 115 kHz switching. Use Value: ±8 kHz frequency spread reduces 115 kHz harmonic peaks by >10 dBμV, easing CISPR 32 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage offline controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VIPER27LD | 60 kHz ±4 kHz oscillator; lower max power (18 W); same 800 V MOSFET and pinout | Better suited for lower-power adapters where EMI filtering cost dominates thermal design | Select when 60 kHz operation simplifies transformer design and lower peak current suffices |
| ICE3BR1765J | 700 V MOSFET; external current sense; no integrated HV startup; requires startup resistor | Higher design flexibility with external sense and gate drive, but +3–4 BOM items added | Choose when programmable OCP, variable frequency, or higher temperature rating (>150 °C) is required |
Compared with VIPER27LD, VIPER26HD delivers higher power density and better light-load efficiency due to its 115 kHz jittered oscillator and tighter burst threshold; versus ICE3BR1765J, it reduces component count and layout complexity but trades off configurability and thermal margin.
Availability
VIPER26HD is available at Aetrix Electronics and suitable for auxiliary power supplies, smart metering systems, and commercial LED drivers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for VIPER26HD 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 microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
VIPER26HD belongs to the VIPer plus family of high-voltage offline controllers, engineered specifically for compact, low-BOM-count AC/DC conversion in cost-sensitive, energy-regulated applications such as appliances and IoT edge devices.
FAQ
What is the maximum continuous output power achievable with VIPER26HD?
VIPER26HD delivers up to 20 W in open-frame designs at 50 °C ambient with adequate heat sinking (100 mm² copper area), and 18 W in enclosed non-ventilated adapters. Power capability depends on PCB thermal design, transformer efficiency, and ambient temperature - exceeding these values risks thermal shutdown activation.
How does the LIM pin adjust the current limit?
The LIM pin sinks current proportional to an external resistor (RLIM) connected to GND. As RLIM decreases, sunk current rises, lowering the effective drain current limit from its default 0.7 A. For example, RLIM = 47 kΩ reduces IDLIM to ~0.5 A; RLIM > 80 kΩ maintains full 0.7 A limit. Capacitor ≤470 nF may be added for noise immunity.
Can VIPER26HD operate in isolated and non-isolated topologies?
Yes - in non-isolated buck or buck-boost, FB connects directly to output via resistor divider; in isolated flyback, FB is shorted to GND to disable the internal error amplifier, and COMP is driven by an optocoupler's phototransistor to close the regulation loop. Pin configuration and compensation network differ between modes.
What triggers burst mode and how does it affect efficiency?
Burst mode activates when COMP voltage drops below 1.1 V (VCOMPL), causing the controller to halt switching and draw only 0.35 mA supply current (IDDoff). When load demand increases, COMP rises above 1.14 V (VCOMPL + 40 mV hysteresis), restarting PWM with reduced peak current (145 mA) to suppress audible noise - achieving <30 mW no-load input power.
VIPER26HD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- VIPer™ plus
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Isolation:
- Either
- Internal Switch(s):
- Yes
- Voltage - Breakdown:
- 800V
- Topology:
- Flyback
- Voltage - Start Up:
- 13 V
- Voltage - Supply (Vcc/Vdd):
- 11.5V ~ 23.5V
- Duty Cycle:
- 70%
- Frequency - Switching:
- 115kHz
- Power (Watts):
- 20 W
- Fault Protection:
- Current Limiting, Over Temperature
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SO
- Mounting Type:
- Surface Mount
VIPER26HD FAQ
1.How can I place an order for VIPER26HD through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER26HD 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 VIPER26HD reliable?
The price and inventory of VIPER26HD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER26HD is usually 5 days.
3.What payment methods are accepted for VIPER26HD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER26HD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER26HD?
VIPER26HD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER26HD 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 VIPER26HD?
For technical support, including VIPER26HD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER26HD requirements.
6.How does Aetrix verify that VIPER26HD is sourced from the original manufacturer or authorized distributors?
All VIPER26HD 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 VIPER26HD meets industry standards.
7.What is the process for return or replacement of VIPER26HD?
All VIPER26HD units undergo pre-shipment inspection (PSI). If there is an issue with VIPER26HD, 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 VIPER26HD part is unused and in its original packaging.
Return procedure for VIPER26HD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VIPER26HD Tags
-
LNK6407D-TL
Power Integrations
-
LNK3204D-TL
Power Integrations
-
SR10LG-G
Microchip Technology
-
TNY285DG-TL
Power Integrations
-
LNK304DN-TL
Power Integrations
-
TNY285KG-TL
Power Integrations
-
LNK3206D-TL
Power Integrations
-
LNK623DG-TL
Power Integrations
-
TNY286PG
Power Integrations
-
LNK624DG-TL
Power Integrations
-
LNK604DG-TL
Power Integrations
-
UCC28704DBVR-1
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
