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STMicroelectronics VIPER26LN
- Part No.:
- VIPER26LN
- Manufacturer:
- STMicroelectronics
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-DIP (0.300", 7.62mm), 7 Leads
- Datasheet:
-
VIPER26LN.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 7DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,556
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Product details
Overview
VIPER26LN from STMicroelectronics is a high-voltage offline PWM controller IC integrating an 800 V avalanche-rugged power MOSFET, current-mode control, and embedded HV startup. 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 VIPER26LN datasheet, VIPER26LN pinout, VIPER26LN application, or VIPER26LN equivalent, this device is selected for low-component-count AC/DC converters requiring wide-input-range operation (85–265 VAC), jittered switching frequency (60 kHz ±4 kHz), adjustable current limiting via LIM pin, burst-mode light-load efficiency, and integrated thermal shutdown with 30 °C hysteresis.
Technical Context
The VIPER26LN implements a fixed-frequency current-mode PWM architecture with internal sense-FET, transconductance error amplifier (GM = 2 mA/V), and programmable drain current limit (IDLIM = 0.7 A typ. at 25 °C). Its oscillator provides spread-spectrum modulation (±4 kHz at 230 Hz) to reduce EMI filter cost without external components.
Startup is enabled by an internal HV current source (IDDR = –1.8 mA typ. at VDRAIN = 640 V), which charges the VDD capacitor until VDD reaches 12–14 V; thereafter, the IC switches and transitions to auxiliary winding biasing. Fault recovery uses automatic restart with 1 s timeout after OLP or short-circuit detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain Voltage Rating | 800 V - enables direct connection to rectified universal AC input (85–265 VAC) without snubber scaling. |
| Switching Frequency | 60 kHz ±4 kHz - jittered spread-spectrum reduces peak EMI amplitude, lowering filter component count and cost. |
| No-Load Input Power | <30 mW @ 230 VAC - meets EU CoC Tier 2 and DOE Level VI standby requirements without auxiliary circuitry. |
| Drain Current Limit | 0.7 A typ. at 25 °C - adjustable downward via external resistor on LIM pin to match transformer saturation margin. |
| Thermal Shutdown | 150–160 °C with 30 °C hysteresis - prevents latch-up during transient overloads; self-recovery avoids manual reset. |
| Burst Mode Threshold | VCOMP ≤ 1.1 V (typ.) - triggers ultra-low-power mode reducing average switching frequency to ~100–500 Hz under light load. |
| Soft-Start Time | 8.5 ms - linearly ramps peak current limit to prevent transformer core saturation and secondary diode stress at startup. |
Pinout & Package
VIPER26LN is available in DIP-7 and SO-16 narrow packages. Thermal performance depends critically on PCB copper area under DRAIN pins (pins 1–2 in DIP-7; pins 13–16 in SO16N), which serve as mechanical and thermal connections to the MOSFET die pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (DIP7 Pin 1–2 / SO16N Pin 1–2) | Controller ground & MOSFET source | Reference node for all internal circuits; must be low-inductance connection to minimize noise coupling into COMP/FB. |
| VDD (DIP7 Pin 5 / SO16N Pin 5) | Controller supply rail | Charged by HV startup current; requires ≥10 µF storage cap + 0.1 µF ceramic bypass; clamped at 23.5 V. |
| LIM (DIP7 Pin 6 / SO16N Pin 6) | Adjustable current limit set point | Sinks current to scale IDLIM downward; 100 kΩ → 0.35 A; open → 0.7 A; capacitor ≤470 nF allowed for noise filtering. |
| FB (DIP7 Pin 7 / SO16N Pin 7) | Inverting input of error amplifier | Internally referenced to 3.3 V; accepts direct output voltage feedback (non-isolated) or opto-coupler signal (isolated). |
| COMP (DIP7 Pin 8 / SO16N Pin 8) | Error amplifier output & loop compensation node | Drives RC network for stability; voltage range 1.1–3.0 V; enters burst mode below 1.1 V; disables E/A when FB = GND. |
| DRAIN (DIP7 Pin 1 / SO16N Pins 13–16) | MOSFET drain terminal | Carries full primary-side switching current; connects to HV startup generator; requires large copper pour for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 800 V power MOSFET | Eliminates external HV switch and gate driver; reduces BOM count by ≥4 components in flyback designs. |
| HV startup current source | –1.8 mA typ. at 640 V - enables direct bulk-capacitor powering without auxiliary winding during startup. |
| Jittered oscillator (±4 kHz) | Spreads spectral energy across 8 kHz bandwidth - cuts peak EMI by >10 dB, relaxing Y-cap and common-mode choke specs. |
| Hysteretic thermal shutdown | 150 °C trip / 120 °C recovery - avoids oscillation near threshold; ensures safe derating before permanent damage. |
| Built-in soft-start (8.5 ms) | Gradually increases cycle-by-cycle current limit - prevents inrush-induced transformer saturation and output overshoot. |
Applications
| Appliance Auxiliary Supply | Smart Meter Power |
|---|---|
|
Use Scenario: Standby power for washing machine control board operating from 230 VAC mains with <50 mW total system budget. IC Role / Device Role / Timing Role: Primary-side flyback controller providing isolated 5 V/100 mA output with burst-mode regulation below 10% load. Use Value: Achieves <25 mW no-load consumption and passes IEC 62301 Ed.2 Class 1 standby limits without auxiliary winding or Zener clamp. |
Use Scenario: Single-stage AC/DC converter powering metrology IC and RTC in electricity meter with 85–265 VAC input range. IC Role / Device Role / Timing Role: Non-isolated buck converter delivering 3.3 V/200 mA directly from rectified AC, using FB pin for direct output sensing. Use Value: Eliminates optocoupler and secondary-side regulator; leverages 800 V MOSFET to withstand surge transients per IEC 61000-4-5 Level 3. |
| LED Driver for Smart Lighting | Set-Top Box SMPS |
|
Use Scenario: Constant-voltage LED driver for tunable-white fixture requiring flicker-free dimming down to 1% output. IC Role / Device Role / Timing Role: Flyback controller with primary-side regulation, using COMP pin to interface with analog dimming signal via optocoupler. Use Value: Burst-mode operation maintains stable output down to 0.5 W while suppressing audible coil whine via reduced IDLIM_bm (145 mA). |
Use Scenario: Main 12 V/1.5 A SMPS in cable set-top box with strict EMI class B limits and 200 ms cold-start requirement. IC Role / Device Role / Timing Role: Fixed-frequency flyback controller with jittered oscillator and integrated soft-start ensuring reliable turn-on under worst-case line/load. Use Value: Reduces EMI filter size by 30% vs. non-jittered 60 kHz controllers; soft-start prevents inrush tripping of upstream fuse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar offline PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE2QS03G | 700 V MOSFET, 65 kHz fixed frequency, no jitter, higher no-load power (~60 mW) | Lacks spread-spectrum EMI reduction; requires larger input filter for same conducted emission level | Prefer when cost sensitivity outweighs EMI filter savings and 800 V ruggedness is not required |
| LNK364PG | 725 V MOSFET, variable frequency (up to 132 kHz), integrated X-cap discharge, no LIM pin adjustment | Uses frequency folding instead of burst mode; lacks programmable current limit for custom transformer design | Choose when X-cap safety discharge is mandatory and precise current limit tuning is unnecessary |
Compared with ICE2QS03G and LNK364PG, VIPER26LN uniquely combines 800 V ruggedness, ±4 kHz jitter, and adjustable current limiting - making it optimal for compact, low-EMI, wide-input auxiliary supplies where transformer flexibility and regulatory compliance are critical.
Availability
VIPER26LN is available at Aetrix Electronics and suitable for appliance auxiliary supplies, smart metering systems, and LED driver designs requiring stable component supply across extended temperature ranges (–40 to 150 °C junction) and long product lifecycles.
Supply support for VIPER26LN 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.
VIPER26LN belongs to the VIPerPlus family of high-voltage offline controllers engineered specifically for cost-sensitive, low-power AC/DC conversion - emphasizing minimal external components, energy-efficiency compliance, and robustness in unregulated grid environments.
FAQ
What is the maximum continuous output power achievable with VIPER26LN in a DIP-7 package?
VIPER26LN delivers up to 18 W in non-ventilated enclosed adapters at 50 °C ambient, and up to 20 W in open-frame designs with adequate heat sinking. This assumes SO16N package for higher thermal performance (1.5 W dissipation vs. 1 W for DIP-7), proper PCB copper area under DRAIN pins, and optimized transformer design meeting SOA limits.
How does the LIM pin adjust the current limit, and what resistor value yields 0.5 A IDLIM?
The LIM pin sinks current proportional to external resistor RLIM to ground, scaling IDLIM downward from its default 0.7 A. Per Figure 12 in DS6901, RLIM ≈ 47 kΩ sets IDLIM to 0.5 A at 25 °C. The relationship is nonlinear and temperature-dependent; RLIM > 80 kΩ reverts to default limit.
Can VIPER26LN operate in isolated flyback topology without an optocoupler?
No - isolated flyback requires optocoupler feedback to close the control loop via the COMP pin. The FB pin must be shorted to GND to disable the internal error amplifier; COMP then receives opto-transistor current to regulate peak drain current. Direct FB sensing is only valid in non-isolated configurations.
What happens during thermal shutdown, and how does recovery occur?
When junction temperature exceeds 150–160 °C, thermal shutdown disables the power MOSFET and halts switching. The IC remains powered via VDD and monitors temperature; once TJ falls below ~120 °C (30 °C hysteresis), it automatically restarts with full soft-start sequence - no external reset or power cycle needed.
VIPER26LN 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:
- 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:
- 60kHz
- Power (Watts):
- 20 W
- Fault Protection:
- Current Limiting, Over Temperature
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 7-DIP
- Mounting Type:
- Through Hole
VIPER26LN FAQ
1.How can I place an order for VIPER26LN through Aetrix?
Please submit a Request for Quotation (RFQ) for VIPER26LN 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 VIPER26LN reliable?
The price and inventory of VIPER26LN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VIPER26LN is usually 5 days.
3.What payment methods are accepted for VIPER26LN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VIPER26LN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VIPER26LN?
VIPER26LN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VIPER26LN 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 VIPER26LN?
For technical support, including VIPER26LN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VIPER26LN requirements.
6.How does Aetrix verify that VIPER26LN is sourced from the original manufacturer or authorized distributors?
All VIPER26LN 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 VIPER26LN meets industry standards.
7.What is the process for return or replacement of VIPER26LN?
All VIPER26LN units undergo pre-shipment inspection (PSI). If there is an issue with VIPER26LN, 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 VIPER26LN part is unused and in its original packaging.
Return procedure for VIPER26LN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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