How do I start selecting a Vicor DCM converter?

Fix the input range from your source, choose the regulated output voltage your load needs, then size the output power with margin. Finally confirm the isolation and the package fit. Those decisions narrow the DCM family quickly.

When do I need a DCM rather than a brick converter?

Choose a DCM when the input is wide or unregulated and you still need a tightly regulated isolated output, as in railway, industrial and battery-backed systems. Choose a brick converter when the input is well regulated and you want the industry-standard footprint. Decide by input range and regulation requirement.

Can BeiLuo help finalize my module choice?

Yes. Send your input range, output voltage, power, isolation and environment, and we will propose a shortlist with efficiency, package and stock status, then support design-in. Getting the module right saves project time.

What selection mistakes should I avoid?

The usual mistakes are choosing a module that cannot cover the full input range, ignoring the output trim, and under-sizing the thermal path. Each adds risk without benefit. Validate the choice on the bench before committing the BOM.

How do I choose between a brick converter and a bus converter?

Use a brick converter such as the Maxi, Mini or Micro family when you need a regulated isolated output from a well-regulated input. Use a BCM bus converter when you need an isolated fixed-ratio intermediate bus for a point-of-load architecture, where efficiency and density are the priority. Decide by whether the output must be regulated.

What does the BCM ratio mean?

The ratio K is the fixed transformation, such as 1/4 or 1/8. The secondary voltage tracks the primary by K, so a BCM provides an isolated ratiometric bus rather than a regulated output. Choose the ratio so the secondary sits in the range your point-of-load regulators need. Modules of the same family cover several ratios.

How do I size the intermediate bus?

Size the bus voltage so the point-of-load regulators have enough headroom across the primary range, and size the bus capacitance for the transient and ripple. Because the BCM acts as a capacitance multiplier, the bulk capacitance can be smaller than with a discrete solution. Our FAE team can help size the bus.

Can I parallel these modules?

Yes. Brick converters support single-wire paralleling with N+M fault tolerance, and BCM bus converters can be paralleled for higher current. Keep the layout symmetric so current shares evenly. Our FAE team can review your paralleling design.

How do I cool a Vicor ChiP module?

ChiP modules have low top-side and bottom-side thermal impedance, so you can remove heat through the top with a heat sink or through the baseplate into the board. Choose the path your mechanical design allows and follow the recommended thermal interface thickness. Use the thermal calculator to verify the margin.

How do I design the input EMI filter?

Even a high-frequency ZVS module needs input filtering to meet conducted-emissions limits. Plan the filter with the module, keep the power loops short, and place the filter close to the module. Measure the conducted emissions with the real load to confirm compliance. Our FAE team can review your filter.

What layout practices reduce noise and heat?

Keep the input and output power loops tight, place the input capacitor close to the module, and use a generous copper area connected to the thermal path. Keep sensitive signals away from the switching nodes and the filter inductors. Layout drives both noise and thermal performance.

How do I verify the thermal margin?

Measure the module case or baseplate temperature at worst-case load and ambient, then compare it with the datasheet limit using the module thermal resistance and the calculated loss. The thermal calculator speeds this up. Confirm the margin before you release the design.

My module runs hotter than expected. Where do I start?

Check the load current against the rating, measure the module loss and compare it with the datasheet efficiency at your operating point, then inspect the thermal interface and the airflow. A thick interface or blocked airflow is a common cause. Verify the margin with the thermal calculator.

Why is my BCM output not the expected ratio?

Confirm the primary voltage is within the specified range, because the secondary tracks the primary by the fixed ratio. Check that the load is within the module rating and that the module is not in a protection state. Verify the ratio code against the datasheet. The secondary is ratiometric, not regulated.

My converter will not start. What should I check?

Check the enable or inhibit signal, the input voltage against the undervoltage and overvoltage lockout, and the start-up capacitance at the load, which must be within the rated limit. Excessive load capacitance is a frequent cause of start-up failure. Measure the input during start-up to confirm the sequence.

My system fails conducted emissions. What is usually wrong?

Conducted-emissions failures usually come from an inadequate or misplaced input filter and from long power loops. Move the filter close to the module, keep the loops tight, add common-mode filtering, and re-measure with the real load. Layout and filtering are the first levers on EMI.

What is the standout feature of the Vicor DCM family?

The DCM accepts a wide, unregulated input and still holds a tightly regulated isolated output, using high-frequency ZVS switching for high efficiency across the line. That combination removes a pre-regulator stage and improves ride-through, which is valuable in wide-input systems. The main design care point is the thermal path and input filtering.

How does the DCM compare with a brick converter in practice?

In practice the DCM wins when the input is wide or unregulated, because it regulates the output regardless of the input. The brick family wins when the input is well regulated and the proven footprint and low noise are the priority. The right choice depends on the source and the regulation requirement. Our FAE team can compare them at your operating point.

Does the ChiP package help thermal design?

Yes. The ChiP package has low top-side and bottom-side thermal impedance, so heat can be removed through the top or through the baseplate, which suits different mechanical designs. On evaluation hardware that flexibility made it easy to keep the module within its limit. Use the thermal calculator to confirm the margin.

Can I get samples to evaluate?

Yes. We provide samples of the Vicor DCM modules for your own efficiency and thermal testing, with documentation included and FAE support during bring-up. Request a sample and we will confirm stock and lead time.

Technical Support | Vicor Expertise | BeiLuo

Guides, application notes, troubleshooting and reviews from BeiLuo's FAE team covering Vicor DCM converters, brick DC-DC modules and BCM bus converters.

Guides 2 Application Notes 1 Troubleshooting 1 Reviews 1

How to Select a Vicor DCM Converter

2026-07-26 - Guides - By Wang Lei Ming

Compare Vicor DCM isolated regulated DC-DC converters by input range, output voltage, power and isolation to choose the right module for your design task.

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How to Select a Vicor Brick or Bus Converter

2026-07-21 - Guides - By Chen Hao Ran

A practical method for choosing between Vicor Maxi Mini Micro brick DC-DC converters and fixed-ratio BCM bus converters for your power architecture design.

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Vicor Module Thermal and EMI Design Notes

2026-07-16 - Application Notes - By Liu Yang Bo

Thermal management, heat-sinking and EMI filtering guidance for integrating Vicor ChiP and brick power modules into dense power systems and enclosures.

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Troubleshooting Vicor Power Modules: A Fault Guide

2026-07-09 - Troubleshooting - By Liu Yang Bo

A systematic method for diagnosing efficiency, thermal, start-up and noise problems in Vicor DCM, brick and BCM power modules inside real power systems.

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Vicor DCM Modules: A Practical Review and Test Report

2026-06-30 - Reviews - By Wang Lei Ming

A hands-on review of Vicor DCM isolated regulated DC-DC converters for wide-input systems, covering efficiency, regulation, thermal behavior and layout practice.

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Meet Our FAE Team

Wang Lei Ming

Senior FAE Engineer, Power Modules

DCM ConvertersPower ArchitectureThermal Design

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Chen Hao Ran

FAE Engineer, Bus Converters

BCM Bus Converters48 V ArchitectureEMI

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Liu Yang Bo

FAE Engineer, Integration and Reliability

ThermalEMI FilteringReliability

Author profile