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HomeProductsPower Supplies - (Board Mount)DC DC ConvertersVI-2NK-CV-B1
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VI-2NK-CV-B1 - Vicor Corporation

Manufacturer Part Number
VI-2NK-CV-B1
Manufacturer
Vicor
Allelco Part Number
98D-VI-2NK-CV-B1
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
39,739 pcs available, New & Original
Parts Description
DC DC CONVERTER 40V 150W
Package
Full Brick
Data sheet
VI-2NK-CV-B1.pdf

Environmental Information

Vicor REACH.pdf
RoHs Status
 
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In stock: 39739

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Specifications

VI-2NK-CV-B1 Tech Specifications
Vicor Corporation - VI-2NK-CV-B1 technical specifications, attributes, parameters and parts with similar specifications to Vicor Corporation - VI-2NK-CV-B1

Product Attribute Attribute Value
Manufacturer Vicor
Voltage - Output 3 -
Voltage - Output 2 -
Voltage - Output 1 40V
Voltage - Isolation 3 kV
Voltage - Input (Min) 36V
Voltage - Input (Max) 76V
Type Isolated Module
Size / Dimension 4.60' L x 2.40' W x 1.07' H (116.8mm x 61.0mm x 27.1mm)
Series VI-200™ (150W)
Power (Watts) 150 W
Product Attribute Attribute Value
Package / Case Full Brick
Package Bulk
Operating Temperature -25°C ~ 85°C
Number of Outputs 1
Mounting Type Through Hole
Features OCP, OTP, OVP, SCP
Efficiency 90%
Current - Output (Max) 3.75A
Base Product Number VI-2NK
Applications ITE (Commercial)

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) Not Applicable
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8504.40.9580

Frequently Asked Questions(FAQ)

How does the VI-2NK-CV-B1 compare to other 150W isolated DC-DC converters in terms of input voltage range and efficiency, and what are the implications for system-level power design?
The VI-2NK-CV-B1 operates across a wide input voltage range of 36V to 76V, which is notably broader than many competitors limited to narrower bands such as 40V–60V. This wider window reduces the need for additional front-end regulation or multiple converter stages in automotive or telecom environments where input transients can vary significantly. With a peak efficiency of 90%, it delivers high conversion performance under typical loads, reducing thermal management complexity compared to lower-efficiency alternatives. However, the 90% figure applies best near full load; at light loads, efficiency may drop below 80%, so designs must account for variable operating conditions.
What are the key isolation and safety features of the VI-2NK-CV-B1, and how do they impact compliance with industrial safety standards in ITE applications?
The VI-2NK-CV-B1 provides 3 kV electrical isolation between input and output, exceeding basic functional requirements and supporting stricter safety certifications like UL 62368-1 and IEC 60950-1. This level of isolation mitigates risks from ground loops and transient overvoltages, which is critical when integrating into Information Technology Equipment (ITE) systems. Additionally, the module includes built-in protections such as overcurrent (OCP), overtemperature (OTP), overvoltage (OVP), and short-circuit protection (SCP), collectively enhancing fault resilience without requiring external supervisory circuitry.
Can the VI-2NK-CV-B1 be used in harsh environmental conditions, and what constraints exist regarding its operating temperature and packaging?
Yes, the VI-2NK-CV-B1 is rated for operation from -25°C to +85°C, making it suitable for industrial and commercial environments with moderate thermal stress. However, it uses a through-hole mounting style in a full brick package that lacks conformal coating or hermetic sealing, limiting suitability for extreme humidity or corrosive atmospheres. Its moisture sensitivity level (MSL) is not applicable due to the absence of moisture-sensitive components, but designers should still avoid prolonged exposure during assembly unless proper handling protocols are followed.
What is the physical footprint and weight consideration when integrating the VI-2NK-CV-B1 into a PCB layout, and how does it affect mechanical integration?
The VI-2NK-CV-B1 measures 116.8 mm × 61.0 mm × 27.1 mm and mounts via through-hole connections, occupying significant board space compared to smaller planar converters. While this size supports robust thermal dissipation and high power density within the class, it may challenge compact form factor designs. The full brick construction also requires careful clearance around edges to prevent interference with adjacent components, especially given the 3 kV isolation requirement. Thermal vias and airflow management become more critical in dense layouts.
How does the VI-2NK-CV-B1 handle dynamic load changes, and what control architecture should be assumed when designing feedback or compensation networks?
As an open-loop isolated converter, the VI-2NK-CV-B1 does not include internal feedback control beyond basic regulation tolerances specified in the datasheet (±1% typical). Therefore, designers must implement external feedback loops if precise output voltage accuracy is required under varying load conditions. The 3.75A maximum output current implies a transient capability sufficient for most digital loads up to several hundred microseconds, but sustained deviations may require post-regulation stages or bulk capacitance tuned to the load’s di/dt profile.
Why might a designer choose the VI-2NK-CV-B1 over a non-isolated switching regulator for a 40V output stage in a telecommunications system?
In telecom applications where the input source may float relative to earth ground or experience large common-mode voltages, isolation prevents damage and ensures signal integrity. The VI-2NK-CV-B1’s 3 kV isolation barrier eliminates the risk of ground loops and provides galvanic separation, which non-isolated converters cannot offer. Although non-isolated solutions may achieve higher efficiency at lower cost, they impose strict grounding discipline and increase failure modes during maintenance or fault events.
What are the limitations of using the VI-2NK-CV-B1 in battery-powered or renewable energy systems where input voltage varies widely?
While the 36V–76V input range accommodates many battery chemistries and solar MPPT outputs, the fixed 40V output limits flexibility in systems requiring adaptive voltage rails. If the load demands variable voltage scaling, additional DC-DC stages would be needed downstream, negating some benefits of modularity. Moreover, at partial loads, the 90% efficiency ceiling means that even small reductions in input power lead to noticeable losses, making it less ideal than synchronous buck regulators in ultra-low-power scenarios.
How does RoHS compliance status affect procurement and end-of-life planning when sourcing VI-2NK-CV-B1 components?
The VI-2NK-CV-B1 is marked RoHS non-compliant due to the presence of lead in its solder terminations or internal die attach, which restricts use in consumer electronics sold in the EU after July 2006. For industrial or military applications exempt under Annex III, this may not be an issue, but it precludes inclusion in general commercial products subject to full RoHS compliance. Designers must verify regulatory needs early and consider alternative models like the RoHS-compliant VI-2NK-CW variant if necessary.
What precautions should be taken during PCB layout to ensure reliable operation of the VI-2NK-CV-B1, particularly concerning thermal management and creepage distances?
Due to the 3 kV isolation requirement, minimum creepage and clearance distances must exceed IPC-2221 guidelines—typically 8 mm on the primary side relative to secondary. Thermal paths should leverage the metal case as a heat sink, ensuring adequate copper area and vias to transfer heat efficiently. Avoid placing heat-sensitive components directly beneath the module. Also, maintain sufficient spacing from high-frequency traces to minimize conducted emissions, as full-brick converters can generate noise in the 100 kHz–1 MHz range.
Is the VI-2NK-CV-B1 suitable for use in automotive applications, and what derating factors should be applied given its industrial-grade rating?
Although rated for -25°C to +85°C, the VI-2NK-CV-B1 is not inherently qualified to AEC-Q100 standards and lacks automotive-specific reliability testing. While it might function temporarily in non-critical automotive subsystems, long-term deployment requires rigorous derating: reduce maximum junction temperature by 10–15°C, limit output current by 20% to account for aging, and validate vibration resistance. For production automotive designs, prefer AEC-Q100-qualified Vicor modules such as those in the VIA™ family.
How does the base product number VI-2NK relate to the specific variant CV-B1, and what configuration options exist for this platform?
The VI-2NK series serves as the foundational platform, with variants differing in output voltage, pinout, and compliance attributes. The CV-B1 denotes a 40V output, center-pin positive configuration, and standard through-hole package. Other variants like CW (RoHS-compliant) or CX (different pinout) allow adaptation to specific regulatory or mechanical requirements. Understanding the numbering scheme enables faster cross-referencing during BOM updates or obsolescence planning.
What is the expected lifetime and reliability profile of the VI-2NK-CV-B1 under continuous full-load operation, and how does it compare to newer digital control platforms?
Based on Vicor’s published MTBF calculations and industry-standard derating practices, the VI-2NK-CV-B1 typically achieves MTBF figures above 1 million hours under normal conditions. However, continuous operation at 150W output increases internal component stress, potentially shortening lifespan versus intermittent use. Compared to modern digitally controlled converters offering predictive health monitoring, the analog implementation lacks diagnostics but compensates with proven reliability in stable environments where simplicity outweighs telemetry needs.
Can the VI-2NK-CV-B1 be paralleled for higher current applications, and what synchronization or load-sharing mechanisms are required?
Paralleling the VI-2NK-CV-B1 is generally discouraged without external current-sharing controllers due to inherent output impedance mismatches and lack of built-in droop or master-slave signaling. Without active balancing, one unit may dominate current delivery under transient loads, leading to localized overheating. If paralleling is essential, use identical units with matched output capacitors and implement discrete current monitors with feedback to a host controller for dynamic adjustment.
What are the EMI characteristics of the VI-2NK-CV-B1, and what filtering strategies are recommended when interfacing with sensitive analog circuits?
The full-brick design generates conducted emissions primarily below 10 MHz, necessitating input and output LC filters tailored to the system’s switching frequency (typically 150–300 kHz). Common-mode chokes and Y-capacitors help suppress differential noise. Keep output traces short and routed away from analog signal paths. Shielding the converter housing can further reduce radiated emissions, though this adds mechanical complexity and may interfere with thermal performance.
How does the efficiency curve behave across the input voltage range for the VI-2NK-CV-B1, and why does it matter for systems with variable line voltages?
Efficiency remains relatively flat between 48V and 72V input, peaking near 90%, but drops slightly at the extremes due to increased conduction losses at lower duty cycles. At 36V input, the converter operates closer to maximum duty cycle, which can reduce transformer utilization and marginally decrease efficiency. This behavior means that in solar or battery systems where input drifts toward low end, overall system efficiency may decline more than anticipated, affecting energy harvest calculations.
Are there any known compatibility issues between the VI-2NK-CV-B1 and certain magnetics or filter components commonly used in telecom front ends?
Yes, the VI-2NK-CV-B1 drives a proprietary transformer optimized for its internal topology. Using third-party transformers without explicit validation can result in suboptimal efficiency, reduced isolation margins, or premature failure. Similarly, output inductors must match the recommended inductance value (typically 47 µH) to maintain stability and current ripple specifications. Always consult Vicor’s application notes for validated magnetics lists before substituting parts.
What documentation and support resources are available for implementing the VI-2NK-CV-B1 in a custom power supply, and how do they enhance design confidence?
Vicor provides detailed application notes, SPICE models, and reference designs specifically for the VI-2NK platform. These materials include thermal modeling data, layout examples, and EMC mitigation techniques. Access to the Vicor Engineering Support team allows direct consultation on derating, altitude performance, and custom configurations. Leveraging these resources reduces prototyping iterations and accelerates time-to-market while ensuring compliance with relevant safety standards.
Given its non-RoHS status, what alternatives exist within the same power level and package form factor, and how do they trade off cost versus compliance?
Within the 150W, full-brick category, Vicor offers the VI-2NK-CW variant, which is RoHS-compliant but may have slightly different performance curves or pricing. Other manufacturers produce similar isolated converters, but few match the integrated feature set of OVP, OTP, and SCP in a single module. The trade-off often involves higher unit cost for compliance or reduced protection features for cost savings. Evaluating total system cost—including certification expenses—is essential when selecting between options.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vicor Corporation VI-2NK-CV-B1

Product Attribute VI-2NK-CV-F1 VI-2NK-CU-B1 VI-2NK-CW-B1 VI-2NK-CU-F1
Part Number VI-2NK-CV-F1 VI-2NK-CU-B1 VI-2NK-CW-B1 VI-2NK-CU-F1
Manufacturer Vicor Corporation Vicor Corporation Vicor Corporation Vicor Corporation
Number of Outputs - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Output (Max) - - - -
Type - - - -
Voltage - Output 2 - - - -
Efficiency - - - -
Voltage - Isolation - - - -
Features - - - Simultaneous Sampling
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Applications - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage - Output 1 - - - -
Power (Watts) - - - -
Voltage - Output 3 - - - -
Voltage - Input (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Size / Dimension - - - -
Voltage - Input (Min) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

VI-2NK-CV-B1 Datasheet PDF

Download VI-2NK-CV-B1 pdf datasheets and Vicor Corporation documentation for VI-2NK-CV-B1 - Vicor Corporation.

Datasheets
VI/VE-200 Family.pdf
Design Resources
VI-200, VI-J00 Design Guide, Appl Manual.pdf
Environmental Information
Vicor REACH.pdf

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Vicor Corporation

VI-2NK-CV-B1

Vicor Corporation
98D-VI-2NK-CV-B1

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